C program to multiply two matrices

Here is the program for matrix multiplication in C.

m and n are rows and columns of the first matrix.

p and q are rows and columns of the second matrix.

Then, multiplication is possible only if n==p.

Program

#include<stdio.h>
 
int main()
{
	int a[5][5],b[5][5],c[5][5],m,n,p,q,i,j,k;
	printf("Enter rows and columns of first matrix:");
	scanf("%d%d",&m,&n);
	printf("Enter rows and columns of second matrix:");
	scanf("%d%d",&p,&q);
	
	if(n==p)
	{
		printf("\nEnter first matrix:\n");
		
		for(i=0;i<m;++i)
			for(j=0;j<n;++j)
				scanf("%d",&a[i][j]);
		
		printf("\nEnter second matrix:\n");
		
		for(i=0;i<p;++i)
			for(j=0;j<q;++j)
				scanf("%d",&b[i][j]);
		
		printf("\nThe new matrix is:\n");
		
		for(i=0;i<m;++i)
		{
			for(j=0;j<q;++j)
			{
				c[i][j]=0;
				for(k=0;k<n;++k)
					c[i][j]=c[i][j]+(a[i][k]*b[k][j]);
						printf("%d ",c[i][j]);
			}
			
			printf("\n");
		}
	}
	else
		printf("\nSorry!!!! Matrix multiplication can't be done");
 
	return 0;
}

Output

Enter rows and columns of first matrix:3
3
Enter rows and columns of second matrix:3
3

Enter first matrix:
1 2 3
4 5 6
7 8 9

Enter second matrix:
9 8 7
6 5 4
3 2 1

The new matrix is:
30 24 18
84 69 54
138 114 90

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