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[Powered by Google Translate] [Command-Line Arguments]

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[Christopher Bartholomeus - Harvard University]

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[Hoc est CS50 - CS50.TV]

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A utilis pluma pro progressio est accipere user input.

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Hactenus, weve explorantur functiones quascunque intra CS50 library

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accipere user input, ut "adepto chorda,"

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Praesent quod promptus, et applicatur currat, fili.

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>> Sunt autem quibus placet providere proposuisti input

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ante actualiter sit cursor.

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Sic Nullam a risus non oportet quaerere

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dum exequen simplex labor.

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Accipite, pro exemplo, mv seu movéntur imperium in Unix.

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Aliquam lima sinit ire praecipit de loco in locum alterius.

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Secundum manual pages, mv acceptat duo order versus argumentorum:

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quod lima limae movetur ad motum et locum.

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Hoc exemplum ideo mandatum duplici ratione.

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Quid est ergo dicere nostro C progressio ut utilitas his imperio-line dicuntur?

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>> Atqui id maxime fit, quibus utimur in C progressio est sacramentum.

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Main acceptat duo parametris: argc et argv.

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His verbis eamus.

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>> Primum parametri, argc, qui stas in argumentum comes,

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habet a notitia typus of integer.

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In argc parameter continet plures rationes, comprehendo imperio.

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In nostra movéntur imperio, licet nos soli duo argumenta proponendum,

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argc scriptor valor erit III.

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Secundo parametri, argv, qui stas in argumentum vector,

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est ordinata chari indicibusque illo puncto ad tangite.

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>> Unde argv singulari, a nihilo,

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continet imperio et rationes.

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Pro exemplo, argv [0], quam ego Peius 'referuntur ad sicut argv nulla,

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semper continent preceptum quod est res run -

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in hoc casu, mv.

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argv [I] continebit primum argumentum, file.txt,

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et argv [II] continebit secundam rationem, ~ / cs50 /.

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Nulla erit ratio ultima argv.

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Sic lets 'implement his imperio-line argumenta.

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In superioribus exercitationes, posuimus vacuo, quod interpretatur nihil, ut main scriptor modularis.

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Sed ut recta imperii nobis uti rationibus

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nos postulo ut aufero vacuo et locum inside of main int argc, chari * argv [].

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Ut elementum a toto obvius argv quae ista,

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vos can simplex RESUMO, aut ansam veniat, per array sicut est hodie.

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Sic, inside of main corpus, erant 'iens ut grassor et typus a, pro loop:

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nam (int i = 0; i <argc; i + +).

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>> Nos operor non postulo a crispus ue hic, quia erant 'solum impleatis, una linea of ​​code

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intra corpus hoc loop.

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Puteus 'grassor ledo tab semel,

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tunc typus printf ("argv [% d], ad repraesentandum integer valorem,

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est% s, pro nervo, tunc nova linea character.

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Deinde nos, providere printf i pro current iteratione de loop

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et argv [i] pro chorda repraesentationem current imperio-line argumentum.

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Cum duo currunt cum argumentis rationibus puteus 'animadverto ut terminum ostendit.

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Nobis superius dixit quod argv tenuisset array chari indicibusque.

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>> Si ita est, quomodo ergo in persona tare accedere?

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Nam si quis velit in primam speciem quaeritur?

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Bene autem dicitur quod oportet ut ansa habitant

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Ergo per quodlibet elementorum REDDO quod tendit argumentum.

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Sic facias.

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>> Primo, erant 'iens ut facere exemplar example2.c.

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Igitur prima ansa intus,

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erant 'iens addere additional pro loop.

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Ita propter (int j = 0, n = strlen (argv [i]),

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Ergo multo quam nunc habet et rationem,

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; J <n; j + +)

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Sumamus cuique loci typis

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intus est current argumentum per usura printf.

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Sic, printf ("argv [% d], ad repraesentandum index current argumentum,

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tunc [% d] iterum, ad repraesentandum current characterem current argumentum,

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est% C, qualis nunc est argumentum.

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Postremo ansam praebent extremo indicis printf ego

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tunc index interioris loop.

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>> Et ultimum argumentum ad printf est actualis character ex ratione dummodo

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iussu linea.

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Nunc quia actum meum strlen adipisci longitudine nervus nervo,

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Oportet me et adde string.h library ad verticem nostra includit.

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Unde ad hoc enim ibo, et sub stdio.h, facturi sumus

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# Includunt <string.h>.

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>> Sic, lets compilare, et currunt et providere eam actualis argumentum.

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>> Et ut videamus jam caritas uniuscuiusque loci prorsus argumentum.

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Sic ut 'eam. Im 'Christopher Bartholomeus hoc est CS50.

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[CS50.TV]