Matrix Multiplication in C

In this tutorial, we are going to see how to multiply two matrices in C. The following program asks the user to enter two matrices and then calculates the multiplication of these two matrices.
 

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Matrix Multiplication in C

#include<stdio.h> 
#include<stdlib.h>

int main(){
  int mat1[10][10], mat2[10][10], res[10][10];
  int n,m,i,j,k;

    printf("Enter the number of rows and columns:\n");
    scanf("%d%d",&n,&m);

    printf("Enter the elements of the first matrix\n");
    for(i = 0; i < n; i++)
    {
        for(j = 0; j < m; j++)
        {
            scanf("%d",&mat1[i][j]);
        }
    }

    printf("Enter the elements of the second matrix\n");
    for(i = 0; i < n; i++)
    {
        for(j = 0; j < m; j++)
        {
            scanf("%d",&mat2[i][j]);
        }
    } 
    
  printf("Matrix multiplication = \n");
  for(i = 0; i < n; i++)
  {
    for(j = 0; j < m; j++)
    {
      res[i][j]=0;
      for(k = 0; k < m; k++)
      {
        res[i][j] += mat1[i][k] * mat2[k][j];
      }
    }
  }
  //Display result
  for(i = 0; i < n; i++)
  {
    for(j = 0; j < m; j++) 
    {
      printf("%d\t",res[i][j]);
    }
    printf("\n");
  }
  return 0;
}

Output:

Enter the number of rows and columns:
2 2
Enter the elements of the first matrix
1 2
1 3
Enter the elements of the second matrix
3 2
1 1
Matrix multiplication = 
5       4
6       5

 

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