What is array ?

An array is a collection of data items or a kind of data structure that can store a fixed size sequential collection of elements of the same type.

Single / One Dimensional Array :

Single / One Dimensional array is used to represent and store data in a liner form and only one subscript variable is called Single / One dimensional array.

Syntax :

<data-type> <array_name> [size];

Example :

/* Description: program to find sum of N integers */ #include<stdio.h> main() { int a[20],i,n,sum=0; printf("How many integers : "); scanf("%d",&n); printf("----------------------"); for(i=1;i<=n;i++) { printf("\nNo. %d - Value enter: ",i); scanf("%d",&a[i]); } for(i=1;i<=n;i++) { sum=sum+a[i]; } printf("----------------------"); printf("\nsum of all integers: %d",sum); getch(); }

Output :

Multi Dimensional Array :

Array have more than one subscript variable is called multi dimensional array, Multi dimensional array also represent or store data.

Syntax :

<data-type> <array_name> [row_subscript][colum_subscript];

Example :

/* Description: matrix sum */ #include<stdio.h> main() { int a[10][10],b[10][10],sum[10][10],i,j,m,n; printf("Enter order of matrix: "); scanf("%d %d",&m,&n); printf("\nput 1st matrix values:\n"); for(i=1;i<=m;i++) { for(j=1;j<=n;j++) { scanf("%d",&a[i][j]); } } printf("\nput 2nd matrix values:\n"); for(i=1;i<=m;i++) { for(j=1;j<=n;j++) { scanf("%d",&b[i][j]); } } printf("\nCalculating...\n"); for(i=1;i<=m;i++) { for(j=1;j<=n;j++) { sum[i][j]=a[i][j]+b[i][j]; } } printf("Result :\n\n"); for(i=1;i<=m;i++) { for(j=1;j<=n;j++) { printf("%d \t",sum[i][j]); } printf("\n"); } getch(); }

Output :