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Arrays

Definition​

An Array is a collection of elements of the same data type.

Declaration​

 int ar[10];
 char ch[10];

Initialisation​

Initialisation refers to giving an initial value to a variable.

int ar[5] = { 10, 20, 30, 40, 50};

Referencing​

Every element in an array can be referenced by its index. Index numbers range from 0 to ( length of array - 1 ).

Following is an example of indexes of the array declared above.

ELEMENTS1020304050
INDEX01234

ar[3] --> 40

ar[0] --> 10

Looping​

To reference each element of the array we use loops.

Input​

#include <stdio.h>
int main()
{
    int ar[5];
    for (int i = 0; i < 5; i++)
    {
        scanf("%d", &ar[i]);
    }
    return 0;
}

Output​

#include <stdio.h>
int main()
{
    int ar[5];

    // INPUT
    for (int i = 0; i < 5; i++)
    {
        scanf("%d", &ar[i]);
    }

    // OUTPUT
    for (int i = 0; i < 5; i++)
    {
        printf("%d", ar[i]);
    }
    return 0;
}

Find Arrays programs here:
https://github.com/TejasBhovad/c-programs/arrays