C Exercises: Multiplication of two Matrices
C Array: Exercise-21 with Solution
Write a program in C for the multiplication of two square matrices.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
void main()
{
int arr1[50][50],brr1[50][50],crr1[50][50],i,j,k,r1,c1,r2,c2,sum=0;
printf("\n\nMultiplication of two Matrices :\n");
printf("----------------------------------\n");
printf("\nInput the rows and columns of first matrix : ");
scanf("%d %d",&r1,&c1);
printf("\nInput the rows and columns of second matrix : ");
scanf("%d %d",&r2,&c2);
if(c1!=r2){
printf("Mutiplication of Matrix is not possible.");
printf("\nColumn of first matrix and row of second matrix must be same.");
}
else
{
printf("Input elements in the first matrix :\n");
for(i=0;i<r1;i++)
{
for(j=0;j<c1;j++)
{
printf("element - [%d],[%d] : ",i,j);
scanf("%d",&arr1[i][j]);
}
}
printf("Input elements in the second matrix :\n");
for(i=0;i<r2;i++)
{
for(j=0;j<c2;j++)
{
printf("element - [%d],[%d] : ",i,j);
scanf("%d",&brr1[i][j]);
}
}
printf("\nThe First matrix is :\n");
for(i=0;i<r1;i++)
{
printf("\n");
for(j=0;j<c1;j++)
printf("%d\t",arr1[i][j]);
}
printf("\nThe Second matrix is :\n");
for(i=0;i<r2;i++)
{
printf("\n");
for(j=0;j<c2;j++)
printf("%d\t",brr1[i][j]);
}
//multiplication of matrix
for(i=0;i<r1;i++)
for(j=0;j<c2;j++)
crr1[i][j]=0;
for(i=0;i<r1;i++) //row of first matrix
{
for(j=0;j<c2;j++) //column of second matrix
{
sum=0;
for(k=0;k<c1;k++)
sum=sum+arr1[i][k]*brr1[k][j];
crr1[i][j]=sum;
}
}
printf("\nThe multiplication of two matrices is : \n");
for(i=0;i<r1;i++)
{
printf("\n");
for(j=0;j<c2;j++)
{
printf("%d\t",crr1[i][j]);
}
}
}
printf("\n\n");
}
Sample Output:
Multiplication of two Matrices : ---------------------------------- Input the rows and columns of first matrix : 2 2 Input the rows and columns of second matrix : 2 2 Input elements in the first matrix : element - [0],[0] : 1 element - [0],[1] : 2 element - [1],[0] : 3 element - [1],[1] : 4 Input elements in the second matrix : element - [0],[0] : 5 element - [0],[1] : 6 element - [1],[0] : 7 element - [1],[1] : 8 The First matrix is : 1 2 3 4 The Second matrix is : 5 6 7 8 The multiplication of two matrices is : 19 22 43 50
Flowchart:

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Previous: Write a program in C for subtraction of two Matrices.
Next: Write a program in C to find transpose of a given matrix.
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C Programming: Tips of the Day
C Programming - What is the argument for printf that formats a long?
Put an l (lowercased letter L) directly before the specifier.
unsigned long n; long m; printf("%lu %ld", n, m);
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