///////    Matrix multiplication    ///////
#include <iostream.h>

int rtc(int *row, int *col, int s, int t)
{       int sum=0;
        while ( s-- > 0 )
        {   sum += *row++ * *col;
            col += t;
        }
        return(sum);
}

void matmul(int *a, int *b, int* c, int r, int s, int t)
{       int i,j;
        for (i=0 ; i < r ; i++)
        {   a += i*s;
            for (j=0 ; j < t ; j++)
                *c++ = rtc(a,b+j,s,t);
        }
}

int main()
{       int a[2][3]= { {1,-2,5}, {1,2,3}};
        int b[3][2]= { {9,7},{-2,3},{-1,4}};
        int c[2][2];
        matmul(*a,*b,*c,2,3,2);
        cout << "( " << c[0][0] << "   " << c[0][1] << ")\n( "
             << c[1][0] << "   " << c[1][1]  << ")\n";
        return(0);
}