1 00:00:00,000 --> 00:00:12,640 2 00:00:12,640 --> 00:00:15,410 >> SPEAKER 1: Hello dinja, dan huwa CS50 Live. 3 00:00:15,410 --> 00:00:18,450 Aħna tixtieq li tibda din id-darba ma ' shout out lill-ħbieb tagħna fil St Louis, 4 00:00:18,450 --> 00:00:21,450 Missouri, fejn grupp ta 'voluntiera magħrufa bħala LaunchCode kienu 5 00:00:21,450 --> 00:00:25,920 ġbir flimkien istudenti CS50x fl sabiex jieħdu l-klassi kollettivament. 6 00:00:25,920 --> 00:00:29,250 U l-mira finalment, huwa li, wara tmiem is-semestru li, huwa li par dawk 7 00:00:29,250 --> 00:00:31,120 studenti bi ftit impjiegi ta 'teknoloġija lokali. 8 00:00:31,120 --> 00:00:34,030 >> Issa Oriġinarjament il-folks LaunchCode, u l-istudenti involuti, kienu jmorru 9 00:00:34,030 --> 00:00:37,550 biex tlaqqa fil-librerija lokali fejn ftit mijiet ta 'nies kienu RSVPed. 10 00:00:37,550 --> 00:00:40,950 Iżda daqstant nies spiċċaw RSVPing fl l-aħħar għal din l-inizjattiva, li huma 11 00:00:40,950 --> 00:00:43,930 ended up jiċċaqilqu għal opra lokali house, jidhru hawn. 12 00:00:43,930 --> 00:00:44,770 >> Issa huwa ftit żgħira. 13 00:00:44,770 --> 00:00:48,320 Imma jekk inti tħares dejjem hekk mill-qrib inti tista ' tara up fuq il-palk li l-ewwel slide 14 00:00:48,320 --> 00:00:53,240 minn f'Ġimgħa 0 li jitkellem għall-fatt li 73% tal-klassi tiegħek, forsi 15 00:00:53,240 --> 00:00:55,650 inkluż inti, ma jkollhom ebda esperjenza minn qabel. 16 00:00:55,650 --> 00:00:58,420 U fil-fatt dan kien ħafna l- każ f'din il-binja opra hawn. 17 00:00:58,420 --> 00:01:01,170 Allura hellos tagħna għall-folks fil LaunchCode u l- 18 00:01:01,170 --> 00:01:02,180 ċittadini ta 'St Louis. 19 00:01:02,180 --> 00:01:05,150 Jekk inti stess tgħix lokali Saint Louis, do tħossok liberu li jiċċekkjaw l barra 20 00:01:05,150 --> 00:01:07,520 fil launchcodestl.com. 21 00:01:07,520 --> 00:01:12,450 Or, forsi, imbagħad fuq aħbarijiet lokali tiegħek jikkanalizzaw kif aħna ser nagħmlu hawn għalik. 22 00:01:12,450 --> 00:01:15,790 >> SPEAKER 2: An opportunità aqwa għal kwalunkwe Saint Louisan tfittex għall-art wieħed 23 00:01:15,790 --> 00:01:18,030 ta 'dawk ta' teknoloġija għolja, għoli tal-ħlas impjiegi. 24 00:01:18,030 --> 00:01:21,440 Għall-ewwel darba, l-istess klassi programmar ta 'kompjuters li l- 25 00:01:21,440 --> 00:01:26,910 mgħallma online minn Harvard u MIT hija jiġu offruti personalment fil-St 26 00:01:26,910 --> 00:01:28,070 Librerija Pubblika Louis. 27 00:01:28,070 --> 00:01:32,670 >> Huwa grazzi għall-organizzazzjoni LaunchCode, li qed jippruvaw isolvu 28 00:01:32,670 --> 00:01:34,900 l-vojt talent tech hawn fil St Louis. 29 00:01:34,900 --> 00:01:39,420 Issa kulmin jgħaddi dan ix-xahar erba ' kors huwa probabbli li jkollhom mħallsa 30 00:01:39,420 --> 00:01:43,260 apprendistat li jistgħu jduru fis- xogħol programmar ta 'kompjuters. 31 00:01:43,260 --> 00:01:47,010 Ko-fundatur LaunchCode tgħid, jekk inti jitgħallmu dan sett ta 'ħiliet, fl-lum 32 00:01:47,010 --> 00:01:52,100 suq inti kważi garantit li l-art xogħol ta 'sitt figura fi ftit 33 00:01:52,100 --> 00:01:55,500 snin, bil-salarju bażiku madwar $ 50,000. 34 00:01:55,500 --> 00:01:56,580 Ħsejjes pretty tajba. 35 00:01:56,580 --> 00:02:00,930 Allura x'tip ta 'persuna għandu tikkunsidra li tieħu din il-klassi? 36 00:02:00,930 --> 00:02:03,890 >> JIM MCKELVEY: Int għandek tkun pretty intelliġenti, OK? 37 00:02:03,890 --> 00:02:06,690 Int għandek tkun estremament iebsa tax-xogħol. 38 00:02:06,690 --> 00:02:08,660 Imma inti ma għandekx li jkollhom marret għall-iskejjel aħjar. 39 00:02:08,660 --> 00:02:09,930 Inti ma għandekx tkun kbira fil-matematika. 40 00:02:09,930 --> 00:02:13,380 Inti ma għandhomx għalfejn ikollhom xi wħud mill- affarijiet li inti jista 'jaħseb li għandek bżonn. 41 00:02:13,380 --> 00:02:16,360 U dan il-kors se jgħidlek jekk inti ħadthom ltqajna. 42 00:02:16,360 --> 00:02:18,490 >> SPEAKER 2: Ara naqra, issa, jekk inti jistaqsi jekk ikun hemm biżżejjed 43 00:02:18,490 --> 00:02:23,270 impjiegi programmazzjoni disponibbli fil St Louis, it-tweġiba hija iva kbir. 44 00:02:23,270 --> 00:02:26,990 MCKELVEY jgħid hemm aktar minn 1,000 pożizzjonijiet miftuħa u biss ma 45 00:02:26,990 --> 00:02:29,250 nies lokali biżżejjed jippruvaw biex jimlewhom. 46 00:02:29,250 --> 00:02:33,250 Issa din il-klassi jibda it-Tnejn fil 05:30 fuq l Fergħa Ċentrali fil-St Louis 47 00:02:33,250 --> 00:02:34,530 Librerija Pubblika. 48 00:02:34,530 --> 00:02:37,770 Jekk int interessat, u jien ċert xi inti se tkun, l-informazzjoni 49 00:02:37,770 --> 00:02:39,020 li ksdk.com. 50 00:02:39,020 --> 00:02:41,582 51 00:02:41,582 --> 00:02:43,960 >> SPEAKER 1: Uħud mill-klassi tiegħek Issa nixtieq ngħid bonjour. 52 00:02:43,960 --> 00:02:48,270 Up ewwel huwa Suzanne, minn Winthrop, Massachusetts, belt fil-qrib biss down 53 00:02:48,270 --> 00:02:50,022 it-triq minn hawn. 54 00:02:50,022 --> 00:02:52,290 >> SUZANNE: Hello dinja, jien Suzanne. 55 00:02:52,290 --> 00:02:56,790 I live in Winthrop, Massachusetts, Istati Uniti, fuq l-ilma. 56 00:02:56,790 --> 00:02:59,630 And I am 63 sena qodma. 57 00:02:59,630 --> 00:03:01,480 Jien infermier rtirati. 58 00:03:01,480 --> 00:03:05,860 I jkollhom erba 'tfal u żewġ neputijiet. 59 00:03:05,860 --> 00:03:09,220 >> Jien ukoll direttur teatru u attriċi. 60 00:03:09,220 --> 00:03:13,550 U f'xi din is-sena I ser tkun tidher fil Discovery Channel "Il- 61 00:03:13,550 --> 00:03:17,840 Boston Strangler. "I jilagħbu Zenovia Clegg. 62 00:03:17,840 --> 00:03:22,445 >> Jien tieħu CS50 minħabba I love EDX. 63 00:03:22,445 --> 00:03:24,595 Stajt jittieħdu żewġ korsijiet preċedenti. 64 00:03:24,595 --> 00:03:32,850 Stajt meħuda Ġustizzja, u s-Saħħa Pubblika u tibdil ambjentali. 65 00:03:32,850 --> 00:03:34,030 U I iħobb minnhom. 66 00:03:34,030 --> 00:03:37,360 >> Wkoll għax-xjenza tal-kompjuter beżgħat me ftit. 67 00:03:37,360 --> 00:03:43,940 U fl-età tiegħi aħna qed mħeġġa li tagħmel affarijiet li frighten us. 68 00:03:43,940 --> 00:03:48,720 Hekk jien tieħu CS50 u tfittex jgħaddulha. 69 00:03:48,720 --> 00:03:52,405 Allura jien jisimni Suzanne, u dan huwa CS50. 70 00:03:52,405 --> 00:03:55,020 71 00:03:55,020 --> 00:03:58,460 >> SPEAKER 1: Up li jmiss diversi hellos minn uħud mill-klassi tiegħek fil Brewer 72 00:03:58,460 --> 00:04:00,160 High School fil Maine. 73 00:04:00,160 --> 00:04:02,010 Ejja tagħti jisimgħu. 74 00:04:02,010 --> 00:04:04,640 >> STUDENTI BREWER HIGH SCHOOL: Hello dinja, aħna qed birra Għoli. 75 00:04:04,640 --> 00:04:05,945 >> PATRICK: Hi, jien Patrick. 76 00:04:05,945 --> 00:04:07,490 >> ADAM: Jien Adam. 77 00:04:07,490 --> 00:04:09,020 >> Nikolai: Jien Nikolai. 78 00:04:09,020 --> 00:04:11,286 >> BEN: Jien Ben. 79 00:04:11,286 --> 00:04:12,660 >> Dylan: Jien Dylan. 80 00:04:12,660 --> 00:04:13,930 >> NICK: Jien Nick. 81 00:04:13,930 --> 00:04:15,085 >> Christina: Jien Christina. 82 00:04:15,085 --> 00:04:16,069 >> Jonathan: Jien Jonathan. 83 00:04:16,069 --> 00:04:17,000 >> CHARLES: Jien Charles. 84 00:04:17,000 --> 00:04:20,890 >> BREWER HIGH SCHOOL STUDENTI: U dan huwa CS50. 85 00:04:20,890 --> 00:04:24,360 >> SPEAKER 1: Hello birra High School - u issa Stuart u ħabib tiegħu, 86 00:04:24,360 --> 00:04:26,320 mill-istat fil-qrib ta 'Virginia. 87 00:04:26,320 --> 00:04:30,300 88 00:04:30,300 --> 00:04:33,170 >> STUART: Hello dinja, isem tiegħi huwa Stuart. 89 00:04:33,170 --> 00:04:35,285 U jien minn Virginia. 90 00:04:35,285 --> 00:04:38,230 U dan huwa tiegħi ewwel darba li tagħmel kors Harvard jew xi 91 00:04:38,230 --> 00:04:41,670 kors onlajn bħal dik. 92 00:04:41,670 --> 00:04:44,980 I really simili kompjuters u trid biex jitgħallmu aktar dwarhom. 93 00:04:44,980 --> 00:04:47,900 Jien Stuart, u dan huwa CS50. 94 00:04:47,900 --> 00:04:49,060 >> SPEAKER 1: Hello Stuart. 95 00:04:49,060 --> 00:04:51,900 Allura aħna ve ukoll li żżomm għajnejk fuq Twitter, fejn wieħed mill-klassi tiegħek, 96 00:04:51,900 --> 00:04:55,020 Umberto mill-Messiku, kellhom dan tweet reċentement. 97 00:04:55,020 --> 00:04:57,270 Ħej, @ davidjmalan, let me nistaqsik mistoqsija - 98 00:04:57,270 --> 00:04:59,210 Mark Zuckerberg ħa CS50? 99 00:04:59,210 --> 00:05:03,450 >> Għalhekk, sfortunatament, Mark ma fil-fatt tieħu CS50 fuq rreġistraw bħala freshman hawn 100 00:05:03,450 --> 00:05:04,050 fil-Harvard. 101 00:05:04,050 --> 00:05:07,570 Pjuttost huwa skipped quddiem lejn aktar klassi avvanzati magħrufa bħala CS51, li 102 00:05:07,570 --> 00:05:10,910 tkopri suġġetti tax-xjenza tal-kompjuter bħal kunċetti astrazzjoni, u programmazzjoni 103 00:05:10,910 --> 00:05:13,900 bħal programmar funzjonali oġġett orjentati lejn programmazzjoni. 104 00:05:13,900 --> 00:05:17,400 >> Issa fiż-żmien li kien mgħallma minn professur jismu Henry Leitner, li 105 00:05:17,400 --> 00:05:19,890 attwalment mgħallma l-kors meta I ħa dan ukoll. 106 00:05:19,890 --> 00:05:23,150 Preceptor tagħna stess, Rob Bowden, reċentement poġġa bilqiegħda mal-Professur 107 00:05:23,150 --> 00:05:28,060 Latiner biex jitkellmu dwar ftit tiegħu ex-studenti minbarra lili. 108 00:05:28,060 --> 00:05:31,620 >> ROB BOWDEN: Hi, jien Rob Bowden, u jien hawn ma 'Dr Henry Leitner, li l- 109 00:05:31,620 --> 00:05:35,270 id-Dekan Assoċjati ta 'Informazzjoni Teknoloġija fil DCE, u Senior Lecturer 110 00:05:35,270 --> 00:05:36,660 fil-Computer Science. 111 00:05:36,660 --> 00:05:41,560 >> Kull dritt, hekk stajt smajt li inti kellna xi ċelebritajiet jgħaddu 112 00:05:41,560 --> 00:05:43,360 permezz ta 'xi korsijiet tiegħek. 113 00:05:43,360 --> 00:05:45,540 >> HENRY LEITNER: Kull dritt, so I simili li tell istudenti tiegħi stajt ġiet fil-Harvard 114 00:05:45,540 --> 00:05:46,240 żmien twil. 115 00:05:46,240 --> 00:05:48,480 U meta jgħidu - ukoll kif ilek hawn? - 116 00:05:48,480 --> 00:05:53,930 tweġiba tiegħi huwa jien qodma biżżejjed biex ikollhom ħadem fuq assenjazzjonijiet dar mal- 117 00:05:53,930 --> 00:05:56,740 li ossiġinu li jinħarġu barra biljunarji Bill Gates. 118 00:05:56,740 --> 00:05:59,650 Imma jien wkoll żgħar biżżejjed biex ikollhom attwalment mgħallma li biljunarji 119 00:05:59,650 --> 00:06:02,960 ossiġinu li jinħarġu barra Mark Zuckerberg, ta 'fama Facebook. 120 00:06:02,960 --> 00:06:08,600 >> Allura jiltaqgħu tiegħi ma 'Bill Gates mod tmur lura għall-bidu fil-1974, 121 00:06:08,600 --> 00:06:11,980 1975 sena akkademika. 122 00:06:11,980 --> 00:06:15,810 L-istorja huwa veru li Bill Gates " ħabib Paul Allen marru għall stand aħbarijiet 123 00:06:15,810 --> 00:06:18,340 fil-Harvard Square u daħal fuq fil Popular Electronics Magazine, li 124 00:06:18,340 --> 00:06:21,170 kienet ikkaratterizzata storja dwar l tad-dinja ewwel kompjuter personali, li 125 00:06:21,170 --> 00:06:24,070 inti kellhom fil-fatt jiżviluppaw - jimmuntaw minn partijiet - l-Altair. 126 00:06:24,070 --> 00:06:26,060 Huwa daħal running lura Dormitory Bill Gates ". 127 00:06:26,060 --> 00:06:28,640 U dawn kollha ltqajna eċċitati li l- rivoluzzjoni tal-kompjuter personali kienet madwar 128 00:06:28,640 --> 00:06:29,760 biex tibda mingħajrhom. 129 00:06:29,760 --> 00:06:31,340 >> Allura fil-ħin, Gates u I - 130 00:06:31,340 --> 00:06:32,270 aħna kienu qed jaħdmu fuq problemi. 131 00:06:32,270 --> 00:06:35,635 Dak għax konna tnejn rreġistrati fl teorija ta 'kors komputazzjoni, a 132 00:06:35,635 --> 00:06:37,690 kors livell graduate Mathy ħafna. 133 00:06:37,690 --> 00:06:40,690 U fl-ewwel jum tal-klassi l- professur qal kulħadd fil-kamra li 134 00:06:40,690 --> 00:06:43,910 dawran li proxxmu tagħhom u jintroduċu infushom, u mbagħad jikkollaboraw ma 135 00:06:43,910 --> 00:06:45,590 dik il-persuna dwar il-problema settijiet. 136 00:06:45,590 --> 00:06:46,440 So Gates u I - 137 00:06:46,440 --> 00:06:47,810 I ma kinitx taf min kien fil-ħin. 138 00:06:47,810 --> 00:06:50,390 Kien forsi sittax jew sbatax, imma hu dehru qishom kien 139 00:06:50,390 --> 00:06:51,840 tnax, li tkun onest. 140 00:06:51,840 --> 00:06:54,010 >> U bdejna biex jaħdmu fuq homeworks flimkien. 141 00:06:54,010 --> 00:06:57,710 Imma mbagħad meta l-Altair ħareġ fl- Popular Electronics Magazine, maqbuda 142 00:06:57,710 --> 00:06:58,760 attenzjoni tiegħu. 143 00:06:58,760 --> 00:06:59,890 Hu biss sparixxew. 144 00:06:59,890 --> 00:07:01,070 Hu waqaf jagħmlu l-homework. 145 00:07:01,070 --> 00:07:02,300 I ltqajna rrabjata fil lilu. 146 00:07:02,300 --> 00:07:06,750 >> U nixtieq biss watch lilu fil-wieħed computing lab kellna fil-Harvard għal 147 00:07:06,750 --> 00:07:09,340 riċerka fiż-żmien, li kienet tissejjaħ l Komputazzjoni Lab Aiken. 148 00:07:09,340 --> 00:07:10,980 A PDP-10 kienet qed tintuża. 149 00:07:10,980 --> 00:07:14,530 U hu kien hacking bogħod lejl u nhar, bażikament biss jgħixu hemm. 150 00:07:14,530 --> 00:07:19,040 >> Kif sibt wara, huwa kien effettivament tfassil software għall-oriġinali 151 00:07:19,040 --> 00:07:22,180 Altair, sistema operattiva, flimkien ma ' l BASIC lingwa ta 'programmar 152 00:07:22,180 --> 00:07:23,630 li kien se run. 153 00:07:23,630 --> 00:07:28,330 L-idea hija li għal personali industrija tal-kompjuter li tieħu off inti 154 00:07:28,330 --> 00:07:29,630 jeħtieġ li jkunu kapaċi li tikteb software. 155 00:07:29,630 --> 00:07:32,540 U l-kitba programmi u magna lingwa mill flipping swiċċijiet toggle 156 00:07:32,540 --> 00:07:35,580 ma kienx se tagħmel dan, ħlief lil hinn mill-hobbyists. 157 00:07:35,580 --> 00:07:39,965 >> Liema kienet interessanti fiż-żmien kien il- Altair kien tant popolari inti ma setgħux 158 00:07:39,965 --> 00:07:41,690 anke tixtri wieħed, ċertament wara kien ħabbar. 159 00:07:41,690 --> 00:07:46,840 Allura Bill Gates, amazingly, bil tiegħu ħabib Paul Allen, kiteb programm fuq 160 00:07:46,840 --> 00:07:51,010 il-PDP-10 li simulata l-imġiba ta 'dan Altair, minħabba li l-specs kienu 161 00:07:51,010 --> 00:07:53,750 kompletament miktuba fil-Popular Electronics Magazine. 162 00:07:53,750 --> 00:07:56,870 >> So, I said, I ltqajna rrabjata fil lilu, I ma ħallsitx attenzjoni. 163 00:07:56,870 --> 00:07:59,840 Huwa sparixxew, marru off għall Albuquerque, New Mexico, li juru off 164 00:07:59,840 --> 00:08:02,220 dak li kellu jsir biex l-folks li kienu bnew l-Altair. 165 00:08:02,220 --> 00:08:07,580 U fil-ħinijiet, li jħallu kulleġġ - jħallu Harvard - jibdew kumpanija 166 00:08:07,580 --> 00:08:08,720 kien fantażija. 167 00:08:08,720 --> 00:08:11,320 U hekk meta I sab li l- dak li ġara I kien sar. 168 00:08:11,320 --> 00:08:13,770 Minħabba I tinżamm ħsieb dwar - tiegħi ġenituri kienu maqtula lili jekk I kellhom 169 00:08:13,770 --> 00:08:17,020 joħroā mill-iskola biss biex go off u tibda kumpanija. 170 00:08:17,020 --> 00:08:18,390 >> U mbagħad naturalment hemm Mark Zuckerberg. 171 00:08:18,390 --> 00:08:23,530 I ltqajna biex tkun taf lilu parzjalment minħabba hu daħal wara li tispiċċa CS51. 172 00:08:23,530 --> 00:08:25,690 I raden kien wara [inaudible] kienu temmew il-kors. 173 00:08:25,690 --> 00:08:30,000 Ried li jaħdmu bħala sħabi tagħlim fis-sena sussegwenti għal CS51. 174 00:08:30,000 --> 00:08:31,370 U hu waslet għall-intervista. 175 00:08:31,370 --> 00:08:35,690 >> U l-verità tal-kwistjoni hija tiegħu prestazzjoni kienet kemmxejn dgħajfa meta mqabbla 176 00:08:35,690 --> 00:08:36,919 lill-folks oħra li kien intervistat. 177 00:08:36,919 --> 00:08:38,450 Kien fil-fatt l-aktar dgħajfa tal-għanqud. 178 00:08:38,450 --> 00:08:42,230 So I ma jħossuhom daqslikieku I tista ' fl kuxjenza tajba kiri lilu. 179 00:08:42,230 --> 00:08:45,746 >> Plus, hu kien fil-daqsxejn ta 'nkwiet mal-bord amministrattiv. 180 00:08:45,746 --> 00:08:48,100 Jekk inti raw il-film, In-Netwerk Soċjali. 181 00:08:48,100 --> 00:08:50,430 OK, daqstant minnu huwa fattwalment veru. 182 00:08:50,430 --> 00:08:55,040 Fil-ħin li kien biss lest tagħmel il Facemash, ma Facebook iżda l- 183 00:08:55,040 --> 00:08:56,020 App Facemash. 184 00:08:56,020 --> 00:09:01,080 U hu kien ġab l-Harvard netwerk involontarjament. 185 00:09:01,080 --> 00:09:05,280 U plus kien insteraq-uċuħ ta ' Harvard nisa undergraduate Kulleġġ 186 00:09:05,280 --> 00:09:05,890 jagħmlu dan il-proġett. 187 00:09:05,890 --> 00:09:07,290 >> Allura kien ippreżentat lill- board amministrattiv. 188 00:09:07,290 --> 00:09:08,570 Huwa kien slapped fuq l-idejn. 189 00:09:08,570 --> 00:09:09,760 Hekk hu kien f'xi inkwiet. 190 00:09:09,760 --> 00:09:12,290 U naħseb li kien tip ta ' disconcerted minn dak. 191 00:09:12,290 --> 00:09:15,890 >> So I simili biex għid lin-nies li jieħdu I ċkejkna, ftit żgħira ta 'kreditu għall- 192 00:09:15,890 --> 00:09:17,710 suċċess ta 'Facebook għaliex - 193 00:09:17,710 --> 00:09:21,970 A, nofs mill-inqas wieħed jew 1% tal- Ħiliet programmazzjoni Zuckerberg daħal 194 00:09:21,970 --> 00:09:23,125 minn kors tiegħi - 195 00:09:23,125 --> 00:09:24,140 dak li tgħallmu hemmhekk. 196 00:09:24,140 --> 00:09:26,880 U t-tieni, kien I mikrija lilu bħala tagħlim sħabi, huwa ma kienx ikollu 197 00:09:26,880 --> 00:09:30,090 iż-żmien biex jitlesta Facebook fil-punt li huwa ma. 198 00:09:30,090 --> 00:09:32,670 >> Allura dan kien ħafna ta 'tagħlim gost xjenza tal-kompjuter fil-Harvard. 199 00:09:32,670 --> 00:09:36,480 I tfisser hemm nies biss aqwa li jmorru fuq biex tagħmel affarijiet kbar. 200 00:09:36,480 --> 00:09:40,480 I tista 'tmur fuq u jgħidlek dwar oħra folks, iżda naħseb ħin tagħna huwa up. 201 00:09:40,480 --> 00:09:43,310 >> ROB BOWDEN: Allura huwa ħsejjes simili Bill Gates jaf xi flus għall-ikkawżar 202 00:09:43,310 --> 00:09:45,260 kollha li l-istress fil-Teorija ta 'komputazzjoni. 203 00:09:45,260 --> 00:09:48,120 U Mark Zuckerberg jaf xi flus għal kiri lilu tibda Facebook. 204 00:09:48,120 --> 00:09:50,370 >> HENRY LEITNER: Li sbieħ mod biex jaħsbu dwar, żgur. 205 00:09:50,370 --> 00:09:52,180 >> ROB BOWDEN: Id-dritt, sew grazzi. 206 00:09:52,180 --> 00:09:53,575 Dan kien kbir. 207 00:09:53,575 --> 00:09:54,825 Grazzi talli me. 208 00:09:54,825 --> 00:09:57,150 209 00:09:57,150 --> 00:09:58,400 Ħawwad naħa tiegħu forsi. 210 00:09:58,400 --> 00:10:01,606 211 00:10:01,606 --> 00:10:02,880 Għandi ħawwad naħa tiegħu? 212 00:10:02,880 --> 00:10:04,560 Jekk aħna jerġa 'jagħmel it-tmiem? 213 00:10:04,560 --> 00:10:05,810 Kif nistgħu nagħmlu it-tmiem? 214 00:10:05,810 --> 00:10:11,430 215 00:10:11,430 --> 00:10:13,290 >> SPEAKER 1: Sussegwentement, kwistjoni minn [? Sin,?] 216 00:10:13,290 --> 00:10:16,110 waħda mill-klassi tiegħek fil-Vjetnam li kellhom dan jgħidu. 217 00:10:16,110 --> 00:10:18,430 Kif għandi nikkuntattja l-oħra nies fil-pajjiż tiegħi? 218 00:10:18,430 --> 00:10:19,565 Well dan ukoll hija kwistjoni kbira. 219 00:10:19,565 --> 00:10:24,703 U jekk inti log fil-interface EDX, għal paġna CS50x tal info prinċipali, tkun taf tara 220 00:10:24,703 --> 00:10:29,520 link għal meetups CS50, li se jwassal inti meetup.com/meet50, li 221 00:10:29,520 --> 00:10:32,650 hija għodda li konna mwaqqfa biex jippermettu inti ssib nies li huma lokali biex 222 00:10:32,650 --> 00:10:35,820 inti sabiex inti tista 'attwalment jiltaqgħu, mhux biss prattikament mal-klassi 223 00:10:35,820 --> 00:10:38,020 din is-sena, iżda personalment kif ukoll. 224 00:10:38,020 --> 00:10:41,160 >> Fil-fatt, meta inti żżur dan il-URL, inti ser tara mappa li tidher bħal dan, 225 00:10:41,160 --> 00:10:44,530 fejn kull markatur jirrappreżenta wieħed jew aktar ta 'klassi tiegħek f'dik il-parti 226 00:10:44,530 --> 00:10:45,350 tad-dinja. 227 00:10:45,350 --> 00:10:49,150 Tabilħaqq dritt issa, xi wħud mill-aktar komunitajiet popolari ta 'studenti CS50x 228 00:10:49,150 --> 00:10:55,030 huma fi New York, Londra, Delhi, Kajr, u San Francisco, u aktar 199 oħra 229 00:10:55,030 --> 00:10:56,000 bliet kif ukoll. 230 00:10:56,000 --> 00:10:59,150 Mela jekk ikunu interessati fil-laqgħa ma 'xi klassi lokalment, ras għal 231 00:10:59,150 --> 00:11:02,050 jilħqu meetup.com/meet50. 232 00:11:02,050 --> 00:11:06,150 >> A kwistjoni issa minn Scott fi New York, li kellhom din il-mistoqsija li jiktbu - 233 00:11:06,150 --> 00:11:09,350 aktar minn darba kull programm juża kordi, hekk għaliex kien printf inkluża fil- 234 00:11:09,350 --> 00:11:11,910 librerija standard I / O, u GetString ma kienx? 235 00:11:11,910 --> 00:11:14,520 Huwa GetString funzjoni definita fil-librerija CS50? 236 00:11:14,520 --> 00:11:18,090 >> Allura iva tabilħaqq, GetString huwa tabilħaqq definit fil-librerija CS50 tal. 237 00:11:18,090 --> 00:11:20,760 U printf, sadanittant, hija il-librerija standard I / O. 238 00:11:20,760 --> 00:11:24,630 Issa lura fil-ġurnata, meta C kien ivvintat, żgur li kien importanti, a 239 00:11:24,630 --> 00:11:28,750 funzjonalità fundamentali għall-kodiċi bħal printf li attwalment print 240 00:11:28,750 --> 00:11:29,545 xi ħaġa li l-iskrin. 241 00:11:29,545 --> 00:11:33,280 Dan kien tant ċentrali għall-kitba software, partikolarment programmi li jimxu ġewwa 242 00:11:33,280 --> 00:11:36,630 ta 'dak tieqa terminal iswed u abjad, li kien jagħmel sens għall printf 243 00:11:36,630 --> 00:11:39,820 tkun inkorporata fil-lingwa tal- libreriji innifsu. 244 00:11:39,820 --> 00:11:43,160 >> Issa inti m'għandekx bżonn GetString sabiex tikseb kordi mill-utenti. 245 00:11:43,160 --> 00:11:45,350 Pjuttost inti tista 'tuża l-funzjonijiet bħal scanf. 246 00:11:45,350 --> 00:11:48,680 Fil-fatt, jekk familjari, tagħti ħarsa lejn xi wħud walkthroughs Ġimgħa 5 ta fejn aħna 247 00:11:48,680 --> 00:11:51,660 walk permezz tal-proċess ta 'użu din il-funzjoni, scanf, biex jiksbu 248 00:11:51,660 --> 00:11:52,890 input mill-utent. 249 00:11:52,890 --> 00:11:56,310 Il-problema hija li l-funzjonijiet simili scanf, li huma mibnija fil lill C 250 00:11:56,310 --> 00:11:59,140 libreriji standard, huwa li dawn ma tagħmel ebda żball iċċekkjar. 251 00:11:59,140 --> 00:12:01,540 U dawn ma attwalment allokati kwalunkwe memorja għall-kordi. 252 00:12:01,540 --> 00:12:03,340 >> Allura koppja ta 'affarijiet ħżiena jista' jiġri - 253 00:12:03,340 --> 00:12:06,970 1, inti tista 'taqbeż il-konfini ta' firxa tiegħek, f'liema każ fl-aħjar, 254 00:12:06,970 --> 00:12:07,960 program tiegħek jista crash. 255 00:12:07,960 --> 00:12:11,400 Iżda fl-agħar, avversarju jista 'jkun tista 'tieħu f'idejha program tiegħek. 256 00:12:11,400 --> 00:12:14,020 U inti għandek bżonn biex jimmaniġġjaw kollha ta 'dak memorja yourself. 257 00:12:14,020 --> 00:12:16,300 >> Allura GetString jneħħi ħafna li l-kumplessità. 258 00:12:16,300 --> 00:12:18,090 Allura li aħna jallokaw memorja għalik. 259 00:12:18,090 --> 00:12:20,800 Għandna niżguraw li inti ma jmorrux lil hinn il-konfini ta 'firxa. 260 00:12:20,800 --> 00:12:23,940 U nerġgħu lura null jekk xejn fil-fatt tmur ħażin. 261 00:12:23,940 --> 00:12:27,490 Allura GetString sempliċement iżid, fl-aħħar tal-ġurnata, mazz sħiħ ta 'utli 262 00:12:27,490 --> 00:12:28,990 verifika żball. 263 00:12:28,990 --> 00:12:32,700 >> Issa kumment minn David fl Ohio li jallega dan - 264 00:12:32,700 --> 00:12:35,670 ebda, inti m'għandekx bżonn l-apparat għall kollha tal-proġetti. 265 00:12:35,670 --> 00:12:37,120 Issa dak ma hu jfisser minn dan? 266 00:12:37,120 --> 00:12:39,930 Ukoll, jirriżulta li David miksuba, minn website online, a 267 00:12:39,930 --> 00:12:44,030 Nokia LCD, bħal dan wieħed hawn, li l- verament id-daqs ta 'xi ħaġa inti tista' 268 00:12:44,030 --> 00:12:45,330 tara fuq cellphone anzjani. 269 00:12:45,330 --> 00:12:48,160 U hu wkoll akkwistati tnedija Tiva bord, biċċa ta 'hardware li 270 00:12:48,160 --> 00:12:49,540 jgħaqqad lil din LCD. 271 00:12:49,540 --> 00:12:50,280 >> Issa huwa pjuttost żgħir. 272 00:12:50,280 --> 00:12:52,720 Kif tista 'tara hawnhekk huwa Kwart Istati Uniti għall-iskala. 273 00:12:52,720 --> 00:12:56,160 U dak li kien ma 'dan huwa fil-fatt timplimenta programm C. 274 00:12:56,160 --> 00:12:59,630 >> Tabilħaqq, inti m'għandekx bżonn l-CS50 appliance jiktbu programmi C. You 275 00:12:59,630 --> 00:13:01,140 ma anki bżonn ta 'Mac jew PC. 276 00:13:01,140 --> 00:13:05,090 Tista 'wkoll tikteb u run kodiċi C fuq apparat inkorporat bħal dan. 277 00:13:05,090 --> 00:13:07,380 Well dak li għamlet David attwalment jiktbu u run? 278 00:13:07,380 --> 00:13:08,490 Ukoll check out. 279 00:13:08,490 --> 00:13:12,390 Huwa implimentat Mario fuq dan ftit żgħira -cellphone bħal screen minn 280 00:13:12,390 --> 00:13:13,660 Problema Issettja 1. 281 00:13:13,660 --> 00:13:16,840 >> So I think I se jaqbel ma waħda mill- Klassi David li, fl-istess 282 00:13:16,840 --> 00:13:19,360 Ħajt Facebook f'liema David introdott dan il-programm ftit għall- 283 00:13:19,360 --> 00:13:20,970 dinja, rrisponda - 284 00:13:20,970 --> 00:13:22,670 inti mate kruha. 285 00:13:22,670 --> 00:13:23,560 Tabilħaqq inti. 286 00:13:23,560 --> 00:13:25,550 >> Issa jmiss up hija biċċa ta 'spam. 287 00:13:25,550 --> 00:13:28,520 Jekk int fil-grupp Facebook CS50, inti jista 'jkollok ndunat xi postijiet simili 288 00:13:28,520 --> 00:13:30,410 dan li kultant slip fil hemmhekk. 289 00:13:30,410 --> 00:13:32,030 Jekk tiltaqa 'ma xi spam, no big deal. 290 00:13:32,030 --> 00:13:34,430 Simply tirrapporta lill magħna u aħna ser imorru quddiem u iħassarha. 291 00:13:34,430 --> 00:13:37,870 Iżda qabel ma aħna ħassar din waħda għandna ma setax jgħinu jieħdu ftit screenshots 292 00:13:37,870 --> 00:13:39,460 u chuckle daqsxejn. 293 00:13:39,460 --> 00:13:43,850 >> Dan student partikolari hawn - aħna ser jsejjaħħlu Alan mobilephone - 294 00:13:43,850 --> 00:13:48,760 stazzjonati numru tiegħu cell phone, tiegħu Tut indirizz chat, Skype ID tiegħu, 295 00:13:48,760 --> 00:13:51,600 indirizz email tiegħu - ebda wieħed minnhom għandek attwalment tikkuntattja. 296 00:13:51,600 --> 00:13:55,970 Imma kif l-ritratti hawn, jidher bħal Alan mobilephone pjuttost ftit 297 00:13:55,970 --> 00:13:59,630 iPhones għall-bejgħ fil dak li jidher li jkun maħżen pjuttost nondescript. 298 00:13:59,630 --> 00:14:04,160 Issa l-istess David wieġbet għal Alan Mobilephone li ġej - 299 00:14:04,160 --> 00:14:06,220 do huma jiġu mal gedit installat? 300 00:14:06,220 --> 00:14:09,220 >> Issa normalment taħseb li xi spambot se biss jinjora risposta għal 301 00:14:09,220 --> 00:14:10,120 ħajt oriġinali tagħhom. 302 00:14:10,120 --> 00:14:14,970 Imma le, Alan mobilephone kienet din li jgħidu - kollha telefowns tagħna huma ġdida fjamanta, 303 00:14:14,970 --> 00:14:17,960 jiġu mal-kaxxa oriġinali u aċċessorji, kollha telefowns tagħna huma SIM 304 00:14:17,960 --> 00:14:19,490 b'xejn, u oħrajn. 305 00:14:19,490 --> 00:14:23,170 >> OK, hekk forsi ġġenerati awtomatikament tweġiba għall David l-bnedmin 306 00:14:23,170 --> 00:14:26,290 rispons, imma David mbuttati ftit aktar - 307 00:14:26,290 --> 00:14:30,010 inti ser tinstalla u tittestja l-CS50 apparat għalina qabel tbaħħir? 308 00:14:30,010 --> 00:14:33,450 Id-dritt, ukoll ejja ara dak Alan Mobilephone li jgħidu issa. 309 00:14:33,450 --> 00:14:37,330 >> Iva u kollha ta 'prodott tagħna huwa taħdem ma SIM cards u networks dinjija. 310 00:14:37,330 --> 00:14:42,830 Fantastic, issa classmate ieħor ta ' tagħna, Daniż, wieġbet ma 'dan. 311 00:14:42,830 --> 00:14:43,730 Dan ikun biża. 312 00:14:43,730 --> 00:14:47,810 Ħu ordni tiegħi kif ukoll għal żewġ, plus waħda ħielsa, 5s iPhone mal-CS50 313 00:14:47,810 --> 00:14:49,470 appliance preinstalled. 314 00:14:49,470 --> 00:14:53,390 >> U fl-aħħarnett, mobilephone Alan qal - iva, kollha se taħdem. 315 00:14:53,390 --> 00:14:54,080 Trust me. 316 00:14:54,080 --> 00:14:57,540 Allura liema mill-prodotti kieku Tixtieq li jixtru minn us. 317 00:14:57,540 --> 00:15:01,890 Jiddispjacini Alan mobilephone, inti issa huma pprojbiti. 318 00:15:01,890 --> 00:15:04,730 >> Chris, issa, minn Toronto, talab din il-kwistjoni minna. 319 00:15:04,730 --> 00:15:06,580 I jkollhom idea għal CS50 Live. 320 00:15:06,580 --> 00:15:09,750 Naħseb ikun kbir jekk David, jew xi wħud mill-persunal ieħor CS50, kellha 321 00:15:09,750 --> 00:15:13,180 scratch wieħed jew aktar sottomessi logħob għall Problem Set 0. 322 00:15:13,180 --> 00:15:14,730 Allura dan huwa suġġeriment kbir. 323 00:15:14,730 --> 00:15:18,670 >> U l-ħaġa hija, peress Problem Set 1 kien rilaxxat fuq Jannar 1, konna 324 00:15:18,670 --> 00:15:20,890 effettivament irċeviet eluf tal scratch proġetti. 325 00:15:20,890 --> 00:15:23,970 Allura aħna ma setgħux possibilment tagħmel lilhom kollha ġustizzja hawn u CS50 Live. 326 00:15:23,970 --> 00:15:26,860 Hekk ħsibna aħna'd ġewwieni out waħda li maqbuda għajn tagħna magħrufa riċentement bħala 327 00:15:26,860 --> 00:15:27,920 Duel wizards ". 328 00:15:27,920 --> 00:15:31,420 >> Duel Wizards "ġie miktub minn classmate jismu Patrick fil Ohio. 329 00:15:31,420 --> 00:15:35,290 U jien kawtela li dan il-proġett verament marru fuq u lil hinn dak li kien 330 00:15:35,290 --> 00:15:36,730 mistenni fil Problema Set 0. 331 00:15:36,730 --> 00:15:39,580 Ebda mod ma fret jekk dan ma jkunx xi ħaġa li ma tistax neċessarjament 332 00:15:39,580 --> 00:15:43,090 tlesti fil ewwel darba tiegħek programmazzjoni, kemm jekk bil Scratch jew 333 00:15:43,090 --> 00:15:44,130 kwalunkwe lingwa oħra. 334 00:15:44,130 --> 00:15:48,420 Iżda aħna ħsibt li jkun gost jilagħbu xi ftit ta 'Duel Wizards "hawn. 335 00:15:48,420 --> 00:15:50,276 >> [Daqq tal-mużika] 336 00:15:50,276 --> 00:16:39,370 337 00:16:39,370 --> 00:16:43,860 >> Amazing, hekk jekk inti stess tixtieq jilagħbu jew Remix Duel Wizards, Ħu 338 00:16:43,860 --> 00:16:45,350 ħarsa lejn din URL hawn. 339 00:16:45,350 --> 00:16:48,130 Jimxi 'l quddiem u biss nieqaf l-video jekk inti tixtieq li tip li pulzieri 340 00:16:48,130 --> 00:16:51,800 >> Well jmiss up huwa proġett ieħor Scratch, dan wieħed minn student jismu 341 00:16:51,800 --> 00:16:54,600 David minn Cambridge, Massachusetts. 342 00:16:54,600 --> 00:16:58,820 Allura dan kien effettivament l-ewwel ħafna programm I myself kiteb lura fl-2007. 343 00:16:58,820 --> 00:17:01,410 I kien student graduate fil-ħin u kelli cross irreġistrat fi 344 00:17:01,410 --> 00:17:05,099 kors ta 'edukazzjoni fil-MIT, mgħallma mill-Professur Mitchel Resnick. 345 00:17:05,099 --> 00:17:07,270 Fil-ħin, Scratch ma tassew jeżistu. 346 00:17:07,270 --> 00:17:10,510 Kien biss fil-format beta, u aħna - l- studenti f'din il-klassi - kellu l- 347 00:17:10,510 --> 00:17:14,050 opportunità unika biex effettivament tilgħab ma ', u esperiment ma Scratch 348 00:17:14,050 --> 00:17:15,160 qabel ħaddieħor. 349 00:17:15,160 --> 00:17:18,400 >> Fil-fatt, waħda mill-ewwel assenjazzjonijiet tagħna fl- din il-klassi kien li fil-fatt jagħmlu tagħna 350 00:17:18,400 --> 00:17:19,420 proġett Scratch stess. 351 00:17:19,420 --> 00:17:23,069 U għal dan il-jum I remember infiq xi tmien sigħat fuq Ġimgħa bil-lejl ta ' 352 00:17:23,069 --> 00:17:25,589 affarijiet kollha li jaħdmu fuq Oscartime hawn. 353 00:17:25,589 --> 00:17:28,550 U issa dawk tal inti familjari mal Oscar l Grouch minn Sesame Street 354 00:17:28,550 --> 00:17:31,700 jista 'fil-mument mfakkra l-kanzunetta li jkunu infurmati dwar li għandha tintlagħab. 355 00:17:31,700 --> 00:17:34,760 >> U I użati li jkollhom ħafna, ħafna memorji fond tal-kanzunetta. 356 00:17:34,760 --> 00:17:38,340 Iżda trust me, wara tmien sigħat ta ' jisimgħu xi ħaġa fuq il-linja, 357 00:17:38,340 --> 00:17:43,730 bi loop dejjem tip, huwa ferm malajr sours daqsxejn ta 'li l-memorja. 358 00:17:43,730 --> 00:17:45,870 Imma għalik, ikollok biss glimpse wieħed fuq dan. 359 00:17:45,870 --> 00:17:49,252 U I jagħtuk dan l-eżempju ta Oscartime. 360 00:17:49,252 --> 00:17:53,190 >> [Daqq tal-mużika] 361 00:17:53,190 --> 00:17:56,940 >> SPEAKER 4: (KANT) Oh I imħabba Trash - 362 00:17:56,940 --> 00:18:05,200 xejn maħmuġin jew dingy jew trab, xejn ragged jew imħassar jew Rusty. 363 00:18:05,200 --> 00:18:08,668 Yes I imħabba Trash. 364 00:18:08,668 --> 00:18:10,980 Hawn xi għalf aktar immuffati. 365 00:18:10,980 --> 00:18:20,012 Iva, I love, I love, I imħabba Trash. 366 00:18:20,012 --> 00:18:23,790 367 00:18:23,790 --> 00:18:26,940 >> SPEAKER 1: Issa jekk inti tixtieq li jkollha jew remix Oscartime, u jtejbu fuq 368 00:18:26,940 --> 00:18:29,500 dan, mur dan il-URL hawn. 369 00:18:29,500 --> 00:18:31,290 Well, li jmiss hija kwistjoni minn [? Bosco?] 370 00:18:31,290 --> 00:18:34,750 f'Hong Kong, li kiteb dan - dak huwa l-lingwa ta 'programmar 371 00:18:34,750 --> 00:18:36,340 wara Scratch MIT? 372 00:18:36,340 --> 00:18:37,330 Allura li l-kwistjoni kbira. 373 00:18:37,330 --> 00:18:40,640 >> Iżda pjuttost milli risposta li lilna nfusna, aħna ddeċidiet li tieħu cameras tagħna isfel 374 00:18:40,640 --> 00:18:44,790 it-triq għall Media Lab MIT, fejn il- Grupp Kindergarten tul il-ħajja huwa, immexxija mill- 375 00:18:44,790 --> 00:18:47,610 Professur Mitchel Resnick, mingħand min I ħa dik snin klassi ilu. 376 00:18:47,610 --> 00:18:50,250 Aħna sodisfatti mhux biss mal-Professur Resnick, iżda wkoll il-John Maloney, 377 00:18:50,250 --> 00:18:52,730 l-awtur oriġinali ta ' il-programm Scratch. 378 00:18:52,730 --> 00:18:56,050 Allura l-software ħafna ilek tuża biex toħloq software ieħor kien 379 00:18:56,050 --> 00:18:58,090 miktuba primarjament minn John. 380 00:18:58,090 --> 00:19:02,020 Isaffru hawn fil-fatt huwa John, myself, u Mitchell permanenti wara reali 381 00:19:02,020 --> 00:19:05,750 Inkarnazzjoni dinja ta 'Scratch dalwaqt wara konverżazzjoni tagħna. 382 00:19:05,750 --> 00:19:10,278 Iżda qabel nieħdu jisimgħu, sittin sekondi hawn tal-ġriewi. 383 00:19:10,278 --> 00:20:11,860 >> [MUSIC - JOHN MAYER, "nirien mifruxa"] 384 00:20:11,860 --> 00:20:16,190 >> Scratch attwalment fil-sinċerità istivi post speċjali fil-qalb tagħna 385 00:20:16,190 --> 00:20:16,990 hawn fuq CS50. 386 00:20:16,990 --> 00:20:20,020 Tabilħaqq, aħna introdotti Scratch fil-kors fl-2007. 387 00:20:20,020 --> 00:20:22,090 U dak li kien jistagħġeb li sena kien dan li ġej. 388 00:20:22,090 --> 00:20:26,130 Billi fis-snin preċedenti, ngħidu-2006, aħna jkollha xi 200 student shop l- 389 00:20:26,130 --> 00:20:29,250 course, li Harvard jitkellmu mezzi li tinżel mill-kors fl-ewwel 390 00:20:29,250 --> 00:20:33,120 ġimgħat mid-semestru, iżda mhux neċessarjament tieħu l-klassi. 391 00:20:33,120 --> 00:20:36,350 67% ta 'dawk l-istudenti tipikament jibqgħu u terga 'lura fil- 392 00:20:36,350 --> 00:20:37,440 il-ġimgħat li jsegwu. 393 00:20:37,440 --> 00:20:40,320 >> Sadanittant fl-2007, meta aħna introdotti Scratch kif ukoll xi oħrajn 394 00:20:40,320 --> 00:20:44,680 tweaks kurrikulari, aħna qabża sa 97% proporzjon żamma ta 'dawk l-istudenti 395 00:20:44,680 --> 00:20:46,200 li kienu shopping CS50. 396 00:20:46,200 --> 00:20:49,960 U hekk qatt minn dakinhar Scratch kien parti essenzjali ta 'CS50, għalkemm biss 397 00:20:49,960 --> 00:20:50,890 f'dan l-ewwel ġimgħa. 398 00:20:50,890 --> 00:20:54,420 Imma I DARE ngħid li tistabbilixxi t-ton tal- kors, u verament jitkellem għall-għan tagħna 399 00:20:54,420 --> 00:20:58,840 fil CS50 ta 'teħid xjenza tal-kompjuter l-aktar aċċessibbli. 400 00:20:58,840 --> 00:21:02,530 Ma 'dak imsemmi, grazzi tagħna lill Mitchell u John u t-tim Scratch kollu. 401 00:21:02,530 --> 00:21:05,710 Ejja issa tieħu f'dak il-qasam vjaġġ fl-triq. 402 00:21:05,710 --> 00:21:06,930 >> Mitchel Resnick: Hi, Jien Mitch Resnick. 403 00:21:06,930 --> 00:21:09,970 Jien professur ta 'Tagħlim Riċerka hawn fil-MIT Media Lab. 404 00:21:09,970 --> 00:21:12,590 U jien ukoll dirett tim Scratch MIT. 405 00:21:12,590 --> 00:21:15,810 >> JOHN MALONEY: Jien John Maloney, u I kien riċerkatur għal madwar eleven 406 00:21:15,810 --> 00:21:19,240 snin, li jaħdmu fuq proġett Scratch bħala l-iżviluppatur ċomb. 407 00:21:19,240 --> 00:21:22,460 >> Mitchel Resnick: Nappellaw riċerka tagħna Grupp Il-Grupp Kindergarten Lifelong 408 00:21:22,460 --> 00:21:24,785 għaliex aħna qed ispirati mill-mod tfal jitgħallmu fil-kindergarten. 409 00:21:24,785 --> 00:21:28,820 Fl-kindergarten klassika, tfal huma playfully tfassil u l-ħolqien 410 00:21:28,820 --> 00:21:30,920 affarijiet fil-kollaborazzjoni ma 'xulxin - 411 00:21:30,920 --> 00:21:33,300 torrijiet bini bi blokki injam, jagħmlu stampi ma 412 00:21:33,300 --> 00:21:34,720 swaba żebgħa u krejons. 413 00:21:34,720 --> 00:21:38,430 Kif aħna żviluppati Scratch, ridna li jaqbdu l-ispirtu kindergarten għall- 414 00:21:38,430 --> 00:21:39,700 studenti ta 'kull età. 415 00:21:39,700 --> 00:21:42,880 >> JOHN MALONEY: Waħda mill-motivazzjonijiet kbar għal Scratch kien dan 416 00:21:42,880 --> 00:21:47,930 proġett li Mitchel u Natalie kellhom beda jissejjaħ il-Clubhouse Computer. 417 00:21:47,930 --> 00:21:54,570 U huma raw ħafna ta 'tfal jagħmlu Jittieħed ma 'għodod tal-midja bħall-Photoshop u 418 00:21:54,570 --> 00:21:58,700 għodod varji tal-produzzjoni tal-ħoss, iżda dawn ma kinux qed jagħmlu ebda programmazzjoni. 419 00:21:58,700 --> 00:22:00,020 Il-gidjien ma kinux qed jagħmlu ebda programmazzjoni. 420 00:22:00,020 --> 00:22:02,440 U aħna stenna madwar u qal - ukoll, għaliex ma huma jagħmlu dan? 421 00:22:02,440 --> 00:22:06,380 U r-risposta deher li jkun li hemm ma kienx għodda li kien xieraq għal 422 00:22:06,380 --> 00:22:07,220 li setting. 423 00:22:07,220 --> 00:22:10,960 >> Mitchel Resnick: Kif konna qed jiżviluppaw Scratch, I kienet ispirata minn uħud mill- 424 00:22:10,960 --> 00:22:13,660 ideat ta 'parrinu tiegħi Seymour Papert, li żviluppaw il- 425 00:22:13,660 --> 00:22:15,640 lingwa ta 'programmar logo. 426 00:22:15,640 --> 00:22:19,535 Seymour dejjem użati biex ngħid li kien importanti għal teknoloġija ġdida li jkollha 427 00:22:19,535 --> 00:22:24,140 art baxxa, fis-sens huwa faċli li tikseb beda bil, limitu għoli, jfissirx li inti 428 00:22:24,140 --> 00:22:25,980 tista 'tagħmel aktar u aktar kumplessi affarijiet magħha. 429 00:22:25,980 --> 00:22:30,480 >> Aħna wkoll riedu li jkollhom nsejħu ħitan wiesgħa, li jfisser li hemm ħafna 430 00:22:30,480 --> 00:22:31,100 mogħdijiet differenti. 431 00:22:31,100 --> 00:22:34,800 Li tista 'tagħmel differenti ħafna affarijiet bis-softwer. 432 00:22:34,800 --> 00:22:38,320 Mhuwiex biżżejjed biss biex tibda faċilment u jagħmlu affarijiet kumplessi jekk 433 00:22:38,320 --> 00:22:39,900 kulħadd qed jagħmel l-istess ħaġa. 434 00:22:39,900 --> 00:22:42,690 Ridna li jkollhom differenti ħafna mogħdijiet, għaliex nafu differenti 435 00:22:42,690 --> 00:22:45,760 nies ikollhom interessi differenti, u aħna riedu kulħadd biex ikunu jistgħu jaħdmu 436 00:22:45,760 --> 00:22:48,090 fuq proġetti li kiber out tal-interessi tagħhom stess. 437 00:22:48,090 --> 00:22:52,020 >> JOHN MALONEY: Nixtieq ngħid li aħna meqjusa madwar għaxar darbiet aktar 438 00:22:52,020 --> 00:22:55,730 kmandi u minn karatteristiċi jkollhom qatt spiċċaw fil Scratch. 439 00:22:55,730 --> 00:23:01,160 Aħna jkollhom dibattiti bla tmiem dwar eżattament dak kliem li jitpoġġew fuq blokki, 440 00:23:01,160 --> 00:23:05,650 u affarijiet simili jekk il-default direzzjoni tal-Sprite għandha tkun sa 441 00:23:05,650 --> 00:23:06,570 jew lejn il-lemin. 442 00:23:06,570 --> 00:23:10,450 Allura aħna ħsibt dwar kollha ta 'dawn l-affarijiet, speċjalment il bikri ħafna 443 00:23:10,450 --> 00:23:13,790 esperjenzi li n-nies jkollhom mal- Scratch, u tipprova tagħmel dan hekk 444 00:23:13,790 --> 00:23:16,800 li l-affarijiet jistgħu jiġu skoperti biss bl-esperimentazzjoni. 445 00:23:16,800 --> 00:23:20,370 >> Mitchel Resnick: Meta konna l-ewwel tfassil Scratch udjenza fil-mira tagħna 446 00:23:20,370 --> 00:23:22,670 kien etajiet 8-16. 447 00:23:22,670 --> 00:23:26,400 >> JOHN MALONEY: Fit-tarf baxx tal- ispettru, sibna li ħafna iżgħar 448 00:23:26,400 --> 00:23:28,940 gidjien kienu qed jużaw Scratch minn aħna qatt antiċipat. 449 00:23:28,940 --> 00:23:33,410 I still remember-ewwel Scratch jum, I think, li kellna. 450 00:23:33,410 --> 00:23:36,340 Dan Guy ftit sitt sena daħal pulzieri 451 00:23:36,340 --> 00:23:41,540 Fit-tarf ta 'fuq, stajt kien sorpriż fuq, per eżempju, l-użu ta 'Scratch fil- 452 00:23:41,540 --> 00:23:43,660 klassijiet kulleġġ bħal CS50. 453 00:23:43,660 --> 00:23:47,750 Għaliex aħna ma verament think ta ' Scratch bħala lingwa għat-tagħlim 454 00:23:47,750 --> 00:23:50,070 xjenza tal-kompjuter lejn kompjuter xjentisti. 455 00:23:50,070 --> 00:23:52,970 >> Sorpriża oħra hija kemm adulti qed jużawh. 456 00:23:52,970 --> 00:23:58,830 We sabu li persuni li huma simili full programmaturi ħin igawdu programmazzjoni 457 00:23:58,830 --> 00:24:00,530 Scratch bħala tip ta 'passatemp. 458 00:24:00,530 --> 00:24:03,860 U hekk aħna stajt tidher nies fuq il-Scratch website joħolqu proġetti li 459 00:24:03,860 --> 00:24:05,470 tagħmel, per eżempju - 460 00:24:05,470 --> 00:24:08,380 ray traċċar sistemi tirrendi 3D. 461 00:24:08,380 --> 00:24:10,120 I ma setax jemmen din meta rajt dan. 462 00:24:10,120 --> 00:24:13,170 >> Mitchel Resnick: Kif aħna bdiet taħdem fuq Scratch, ridna li jagħmluha 463 00:24:13,170 --> 00:24:16,360 differenti minn programmazzjoni preċedenti lingwi sabiex ikun 464 00:24:16,360 --> 00:24:19,010 aċċessibbli għal ħafna usa ' firxa ta 'nies. 465 00:24:19,010 --> 00:24:21,770 Allura kellna tliet qalba prinċipji ta 'gwida. 466 00:24:21,770 --> 00:24:24,880 L-ewwel ridna li jagħmluha aktar tinkerable, sabiex inti tista 'tibni up 467 00:24:24,880 --> 00:24:27,810 programmi simili ħafna tqegħid Briks LEGO flimkien. 468 00:24:27,810 --> 00:24:30,760 Allura kellna l-ipprogrammar viżwali blokk li mhux flimkien. 469 00:24:30,760 --> 00:24:34,670 >> It-tieni nett, ridna biex in-nies jaħdmu fuq proġetti aktar sinifikanti, 470 00:24:34,670 --> 00:24:37,060 affarijiet li kienu personalment rilevanti għalihom. 471 00:24:37,060 --> 00:24:38,890 C'est pourquoi nagħmlu Scratch hekk midja sinjuri. 472 00:24:38,890 --> 00:24:41,230 >> It-tielet nett, ridna li jagħmilha aktar soċjali. 473 00:24:41,230 --> 00:24:43,580 Peress li ħafna mill-aħjar tagħlim esperjenzi ġejjin meta aħna 474 00:24:43,580 --> 00:24:45,220 jinteraġixxu ma 'oħrajn. 475 00:24:45,220 --> 00:24:48,590 Allura aħna miżjud l-komunità online Scratch mill-bidu nett, 476 00:24:48,590 --> 00:24:51,790 dritt meta varajna l-software, hekk li n-nies ikollhom udjenza 477 00:24:51,790 --> 00:24:55,460 għall-kreazzjonijiet tagħhom, u wkoll tikseb ispirati mill-liema nies oħra maħluqa. 478 00:24:55,460 --> 00:24:59,720 Minħabba li aħna imnedija scratch kien hemm Kien madwar 4.5 miljuni proġetti li 479 00:24:59,720 --> 00:25:01,760 kienu maqsuma fuq il- Websajt Scratch. 480 00:25:01,760 --> 00:25:05,610 >> JOHN MALONEY: So I attwalment ssieħbu-proġett billi sort 481 00:25:05,610 --> 00:25:07,770 ta 'nota għal Mitchel. 482 00:25:07,770 --> 00:25:10,510 I talab li ssieħbu meta smajt dwar dan, għaliex ħsibt li kienet se 483 00:25:10,510 --> 00:25:12,790 tkun tali ħaġa jibred u Jien ridt li jgħinu. 484 00:25:12,790 --> 00:25:17,010 Iżda lingwa favorit tiegħi kien Smalltalk, u kelli għenet fl-iżvilupp 485 00:25:17,010 --> 00:25:19,430 din il-verżjoni tal Smalltalk imsejħa Squeak. 486 00:25:19,430 --> 00:25:23,240 >> So I qal, ukoll, jien ser jidħlu u jagħmlu dan ix-xogħol sakemm I 487 00:25:23,240 --> 00:25:24,960 tista 'tibni fil Squeak. 488 00:25:24,960 --> 00:25:27,920 U Mitchel qal - oh żgur, I ma kura dak huwa magħmul pulzieri 489 00:25:27,920 --> 00:25:28,920 Just jagħmluha taħdem. 490 00:25:28,920 --> 00:25:31,950 U hekk li kif ltqajna biex jinkitbu Squeak. 491 00:25:31,950 --> 00:25:36,730 >> Allura ma Scratch 2.0 ħsibna li aħna se jipprova jagħmel Scratch jilħqu 492 00:25:36,730 --> 00:25:39,750 aktar nies billi jagħmilha app Cloud bbażata. 493 00:25:39,750 --> 00:25:43,290 U, għalkemm kien hemm verżjoni ta ' Squeak li dam fil-browser, huwa 494 00:25:43,290 --> 00:25:45,960 tniżżil meħtieġa u installazzjoni ta 'plug-in. 495 00:25:45,960 --> 00:25:49,450 U aħna kien jaf li ħafna nies kieku jkollhom problemi tagħmel dan, jew 496 00:25:49,450 --> 00:25:54,310 għaliex kien proċess ikkumplikat jew minħabba li l-amministrazzjoni tagħhom fi 497 00:25:54,310 --> 00:25:56,470 iskola tagħhom, jew kwalunkwe, ma tippermettix dan. 498 00:25:56,470 --> 00:26:00,310 Allura ridna xi ħaġa li kienet tip mibnija fil-browsers, jew kien 499 00:26:00,310 --> 00:26:03,050 tip ta 'kontumaċja hemm fuq browsers aktar. 500 00:26:03,050 --> 00:26:07,100 Aħna kkunsidrati Java, aħna meqjus Silverlight, aħna meqjusa JavaScript, 501 00:26:07,100 --> 00:26:08,590 u aħna meqjusa Flash. 502 00:26:08,590 --> 00:26:11,020 >> F'dak il-punt Flash kien verament fuq l-avvanz. 503 00:26:11,020 --> 00:26:12,350 Adobe kien verament timbuttah. 504 00:26:12,350 --> 00:26:17,420 U aħna ma tafx li kienet se li jkun tali problema fuq IOS, u 505 00:26:17,420 --> 00:26:19,200 apparat mobbli, u oħrajn. 506 00:26:19,200 --> 00:26:20,480 Allura aħna marru ma 'Flash. 507 00:26:20,480 --> 00:26:25,690 >> U retrospettivament ikun stajt forsi Kien nicer jekk aħna'd marret ma 508 00:26:25,690 --> 00:26:27,900 JavaScript għaliex thats issir l-lingwa dominanti. 509 00:26:27,900 --> 00:26:31,690 Imma ma naħsibx li hemm xi mod aħna jista 'possibbilment raw l- 510 00:26:31,690 --> 00:26:33,690 affarijiet li kienu se jibdlu bejn dakinhar u llum. 511 00:26:33,690 --> 00:26:37,620 U li tieħu tliet snin jew hekk li tpoġġi flimkien xi ħaġa bħal din. 512 00:26:37,620 --> 00:26:40,860 Allura inti tagħmel raden tiegħek aħjar u tama għall-aħjar. 513 00:26:40,860 --> 00:26:44,720 >> Mitchel Resnick: One proġetti ġodda huwa imsejħa Junior Scratch, jippruvaw li jkollhom 514 00:26:44,720 --> 00:26:47,130 Scratch jinżlu għal tfal saħansitra iżgħar. 515 00:26:47,130 --> 00:26:49,810 Huwa qed mmirati lejn l-età ta 'ħames għal seba 'il sena, bħall- 516 00:26:49,810 --> 00:26:51,780 kindergarten għat-tieni grad. 517 00:26:51,780 --> 00:26:53,610 L-ewwel verżjoni ta 'dan se tkun fuq il-iPad. 518 00:26:53,610 --> 00:26:57,130 U qed nippjanaw li jkollhom dan jasal fl-nofs tal-2014. 519 00:26:57,130 --> 00:26:59,660 Allura Scratch Junior se jkun kemmxejn mnaqqsa verżjoni. 520 00:26:59,660 --> 00:27:02,540 Dan se jkollu xi ftit karatteristiċi inqas, u wkoll tagħmel l-affarijiet aktar 521 00:27:02,540 --> 00:27:05,450 developmentally xieraq għat-tfal iżgħar. 522 00:27:05,450 --> 00:27:09,580 >> JOHN MALONEY: I igawdu l-fatt li Scratch 2.0, speċjalment, hija tip ta ' 523 00:27:09,580 --> 00:27:14,070 prestazzjoni segretament ogħla milli suppost jista 'jimmaġina. 524 00:27:14,070 --> 00:27:16,410 Konvenzjonalment, meta int tagħmel animazzjonijiet u oħrajn, int 525 00:27:16,410 --> 00:27:20,730 limitata għall-aġġornament rata tal-iskrin. 526 00:27:20,730 --> 00:27:24,610 U aħna ddisinjati hija deliberatament hekk li hija biss ma ftit kull 527 00:27:24,610 --> 00:27:30,330 qafas, b'tali mod li jekk inti tgħidli jirrepeti 10, tmexxi 10, int attwalment tara dan jiċċaqalqu 528 00:27:30,330 --> 00:27:32,450 għaxar inkrementi ftit. 529 00:27:32,450 --> 00:27:36,590 >> Madankollu, hemm tip ta 'modalità moħbija imsejħa modalità turbo, li tista 'tikseb 530 00:27:36,590 --> 00:27:38,920 billi shift tikklikkja fuq il-bandiera aħdar. 531 00:27:38,920 --> 00:27:42,670 U li bażikament tikri run tip ta 'malajr kemm jista'. 532 00:27:42,670 --> 00:27:46,210 Allura dan huwa dak li ihallik tagħmel affarijiet simili il-tracer ray, u inti ma 533 00:27:46,210 --> 00:27:49,480 jkollhom - l-tracer ray oriġinali, inti kellu jistenna simili madwar nofs siegħa biex 534 00:27:49,480 --> 00:27:52,020 tara r-riżultati, minħabba li kienet tip ta 'chugging permezz 535 00:27:52,020 --> 00:27:53,060 frame wieħed kull darba. 536 00:27:53,060 --> 00:27:57,240 Iżda, ma 'l-ħaġa click shift, inti tista' tikseb ir-riżultati fil xi ħaġa simili 537 00:27:57,240 --> 00:27:58,980 għoxrin sekonda. 538 00:27:58,980 --> 00:28:03,610 Allura kollha f'daqqa inti tista 'sempliċement tip ta' affarijiet ta 'livell għoli fil Scratch, iżda 539 00:28:03,610 --> 00:28:05,990 huwa karatteristika moħbija. 540 00:28:05,990 --> 00:28:08,470 >> SPEAKER 1: Grazzi tant għall Mitchel u John għal kollox 541 00:28:08,470 --> 00:28:09,890 li ghamilt għall CS50. 542 00:28:09,890 --> 00:28:13,190 Grazzi għall Andrew, Al, u Shelley, li huma wara l-kameras din il-ġimgħa. 543 00:28:13,190 --> 00:28:15,460 U grazzi tant għall kollha tal- studenti, dawk minnkom hemmhekk li 544 00:28:15,460 --> 00:28:16,290 kontenut sottomessi. 545 00:28:16,290 --> 00:28:22,340 >> U fil-fatt, jekk inti tixtieq li ikkontribwixxew kontenut għal ġimgħa futur, 546 00:28:22,340 --> 00:28:26,420 do jilħqu us via Facebook, Reddit, Twitter, jew kwalunkwe mill-oħra 547 00:28:26,420 --> 00:28:27,570 mezzi kors'S. 548 00:28:27,570 --> 00:28:29,750 Li lilha għall CS50 Live. 549 00:28:29,750 --> 00:28:32,480 Dan kien CS50. 550 00:28:32,480 --> 00:28:33,730 Kkritikat dan. 551 00:28:33,730 --> 00:29:04,598