Arrays
An array lets you declare and work with a collection of values of the same type. For example, you might want to create a collection of five integers. One way to do it would be to declare five integers directly:
int a, b, c, d, e;
This is okay, but what if you needed a thousand integers?
For 1 thousand :
int a,b,c,d,e………….
or
int a[1000];
An easier way is to declare an array of five integers:
int a[5];
The five separate integers inside this array are accessed by an index. All arrays start at index zero and go to n-1 in C. Thus, int a[5]; contains five elements. For example:
int a[5];
a[0] = 12;
a[1] = 9;
a[2] = 14;
a[3] = 5;
a[4] = 1;
One of the nice things about array indexing is that you can use a loop to manipulate the index. For example, the following code initializes all of the values in the array to 0:
#include <stdio.h>
int main()
{
int a[5];
int i;
for (i=0; i<5; i++)
{a[i] = 0;
printf("a[%d] = %d\n", i, a[i]);}
getchar(); }
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