C Program to Add Two Matrix Using Multi-dimensional Arrays

This program takes two matrices of order r*c and stores it in two-dimensional array. Then, the program adds these two matrices and displays it on the screen.

To understand this example, you should have the knowledge of following C programming topics:

In this program, user is asked to entered the number of rows r and columns c. The value of r and c should be less than 100 in this program.

The user is asked to enter elements of two matrices (of order r*c).

Then, the program adds these two matrices, saves it in another matrix (two-dimensional array) and displays it on the screen.

Example: Program to Add Two Matrices

#include <stdio.h>
int main(){
    int r, c, a[100][100], b[100][100], sum[100][100], i, j;

    printf("Enter number of rows (between 1 and 100): ");
    scanf("%d", &r);
    printf("Enter number of columns (between 1 and 100): ");
    scanf("%d", &c);

    printf("\nEnter elements of 1st matrix:\n");

    for(i=0; i<r; ++i)
        for(j=0; j<c; ++j)
        {
            printf("Enter element a%d%d: ",i+1,j+1);
            scanf("%d",&a[i][j]);
        }

    printf("Enter elements of 2nd matrix:\n");
    for(i=0; i<r; ++i)
        for(j=0; j<c; ++j)
        {
            printf("Enter element a%d%d: ",i+1, j+1);
            scanf("%d", &b[i][j]);
        }

    // Adding Two matrices

    for(i=0;i<r;++i)
        for(j=0;j<c;++j)
        {
            sum[i][j]=a[i][j]+b[i][j];
        }

    // Displaying the result
    printf("\nSum of two matrix is: \n\n");

    for(i=0;i<r;++i)
        for(j=0;j<c;++j)
        {

            printf("%d   ",sum[i][j]);

            if(j==c-1)
            {
                printf("\n\n");
            }
        }
    
    return 0;
}

Output

Enter number of rows (between 1 and 100): 2
Enter number of columns (between 1 and 100): 3

Enter elements of 1st matrix:
Enter element a11: 2
Enter element a12: 3
Enter element a13: 4
Enter element a21: 5
Enter element a22: 2
Enter element a23: 3
Enter elements of 2nd matrix:
Enter element a11: -4
Enter element a12: 5
Enter element a13: 3
Enter element a21: 5
Enter element a22: 6
Enter element a23: 3

Sum of two matrix is: 

-2   8   7   

10   8   6