#include<stdio.h>
#define ROW 3
#define COL 3
int main()
{
int First[3][3],Second[3][3],Result[3][3];
int m1,n1,m2,n2,i,j;
printf("Enter no of row and column for 1st matrix\n");
scanf("%d%d",&m1,&n1);
printf("Enter no of row and column for 2nd matrix\n");
scanf("%d%d",&m2,&n2);
//check if multiplication is possible, 1st matrix rows must be equal to
//Second matrix columns
if(n1==m2)
{
printf("Enter First matrix\n");
matrixInput(First);
printf("\nEnter Second matrix\n");
matrixInput(Second);
matrixMultiply(First,Second,Result);
printf("Product of entered matrices :-\n");
//print the resultant matrices
for(i=0;i<m1;i++)
{
for(j=0;j<n2;j++)
printf("%d\t",*(*(Result + i) + j));
printf("\n");
}
}
else
{
printf("Sorry ! Multiplication is not possible");
}
return 0;
}
//Get matrix data
void matrixInput(int mat[][COL])
{
int row, col;
for (row = 0; row < ROW; row++)
{
for (col = 0; col < COL; col++)
{
scanf("%d", (*(mat + row) + col));
}
}
}
//Function to multiply Matrices mat1 * mat2 = res
void matrixMultiply(int mat1[][COL], int mat2[][COL], int res[][COL])
{
int row, col, i;
int sum;
for (row = 0; row < ROW; row++)
{
for (col = 0; col < COL; col++)
{
sum = 0;
// find the sum of product of each elements of row for first matirx
// and columsn of second
for (i = 0; i < COL; i++)
{
sum += (*(*(mat1 + row) + i)) * (*(*(mat2 + i) + col));
}
//save sum in resultant matrix
*(*(res + row) + col) = sum;
}
}
}
