Objective-C: Visual QuickStart Guide

3. Handling Data

This chapter is all about working with data in Objective-C. You’ll use arrays, pointers, strings, and more.

An array is a set of data items, called elements, that you can refer to with an array index. For example, if you store numbers in an array named array, you can address each element with an index number like this: array[0], which refers to the first element; array[1], which refers to the second element; and so on. The following code creates an array of five elements, stores a value of 51 in array[0], and then displays that value:

#include <stdio.h>int main(){  int array[5];  array[0] = 51;  printf("array[0] is %i.\n", array[0]);  return 0;}

Pointers are special variables that hold the address in memory of data items. You ...