/*
 * array.c
 *
 * Computer Science 50, Fall 2011
 * section4
 *
 * Practice with treating arrays as pointers and navigating through
 * them with pointer arithmetic.
 */

#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char* argv[])
{
    // ensures user entered one and only one command line arguments
    if(argc != 2)
    {
        printf("Usage: ./array size\n");
        return 1;
    }
    
    // converts input to an integer
    int size = atoi(argv[1]);
    
    // ensures value is greater than 0
    if(size <= 0)
    {
        printf("Please enter a positive integer.\n");
        return 2;
    }
    
    // initalizes new array
    int* nums = malloc(sizeof(int) * size);
    
    // uses pointer arithmetic to store integers starting at 0
    for(int i = 0; i < size; i++)
        *(nums + i) = i;

    // uses index notation to add 1 to each element
    for(int j = 0; j < size; j++)
        nums[j] += 1;
    
    // prints final array
    for(int k = 0; k < size; k++)
        printf("%d\n", nums[k]);
    
    // frees allocated memory
    free(nums);
    
    // success
    return 0;
}