Multiplying two matrices is that the number of columns in the first matrix must be equal to the number of rows in the second matrix.

multiplication of two matrix in c

The nested loops that actually compute the matrix multiplication.

			
					for(i=0; i<2; i++)
{
    for(j=0; j<4; j++)
    {
        matR[i][j]=0;
        for(k=0; k<3; k++)
        {
            matR[i][j]=matR[i][j]+matA[i][k]*matB[k][j];
        }
    }
}

Variable i represents the row of the resultant matrix.
Variable j represents the column of the resultant matrix.
Variable k represents the common factor.

			
					#include <stdio.h>
int main ()
{
    int matA[2][3], matB[3][4], matR[2][4];
    int i, j, k;
    printf ("Enter elements of the first matrix of order 2 x 3 \n");
    for (i = 0; i < 2; i++)
    {
        for (j = 0; j < 3; j++)
        {
            scanf ("%d", &matA[i][j]);
        }
    }
    printf ("Enter elements of the second matrix of order 3 x 4 \n");
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 4; j++)
        {
            scanf ("%d", &matB[i][j]);
        }
    }
    for (i = 0; i < 2; i++)
    {
        for (j = 0; j < 4; j++)
        {
            matR[i][j] = 0;
            for (k = 0; k < 3; k++)
            {
                matR[i][j] = matR[i][j] + matA[i][k] * matB[k][j];
            }
        }
    }
    printf ("\nFirst Matrix is \n");
    for (i = 0; i < 2; i++)
    {
        for (j = 0; j < 3; j++)
        {
            printf ("%d\t", matA[i][j]);
        }
        printf ("\n");
    }
    printf ("\nSecond Matrix is \n");
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 4; j++)
        {
            printf ("%d\t", matB[i][j]);
        }
        printf ("\n");
    }
    printf ("\nMatrix multiplication is \n");
    for (i = 0; i < 2; i++)
    {
        for (j = 0; j < 4; j++)
        {
            printf ("%d\t", matR[i][j]);
        }
        printf ("\n");
    }
    return 0;
}

			
					Enter elements of the first matrix of order 2 x 3 
Enter elements of the second matrix of order 3 x 4 

First Matrix is 
1   2   3   
4   5   6   

Second Matrix is 
7   8   9   10  
11  12  13  14  
15  16  17  18  

Matrix multiplication is 
74  80  86  92  
173 188 203 218

Multiplying two matrices in C

multiplication of two matrix in c