#include <iostream>
using namespace std;
class multi
{
int a[10][10], b[10][10], mult[10][10], r1, c1, r2, c2, i, j, k;
public:
multi(int r1, int c1, int r2, int c2)
{
this->r1 = r1;
this->c1 = c1;
this->r2 = r2;
this->c2 = c2;
int a[r1][c1], b[r2][c2];
}
void matrix()
{
// Storing elements of first matrix.
cout << endl
<< "Enter elements of matrix 1:" << endl;
for (i = 0; i < r1; ++i)
for (j = 0; j < c1; ++j)
{
cout << "Enter element a" << i + 1 << j + 1 << " : ";
cin >> a[i][j];
}
// Storing elements of second matrix.
cout << endl
<< "Enter elements of matrix 2:" << endl;
for (i = 0; i < r2; ++i)
for (j = 0; j < c2; ++j)
{
cout << "Enter element b" << i + 1 << j + 1 << " : ";
cin >> b[i][j];
}
}
void multip()
{
// Initializing elements of matrix mult to 0.
for (i = 0; i < r1; ++i)
for (j = 0; j < c2; ++j)
{
mult[i][j] = 0;
}
// Multiplying matrix a and b and storing in array mult.
for (i = 0; i < r1; ++i)
for (j = 0; j < c2; ++j)
for (k = 0; k < c1; ++k)
{
mult[i][j] += a[i][k] * b[k][j];
}
// Displaying the multiplication of two matrix.
cout << endl
<< "Output Matrix: " << endl;
for (i = 0; i < r1; ++i)
{
for (j = 0; j < c2; ++j)
{
cout << " " << mult[i][j];
}
cout << endl;
}
}
};
int main()
{
int r1, c1, r2, c2;
cout << "Enter rows and columns for first matrix: ";
cin >> r1 >> c1;
cout << "Enter rows and columns for second matrix: ";
cin >> r2 >> c2;
// If column of first matrix in not equal to row of second matrix,
// ask the user to enter the size of matrix again.
while (c1 != r2)
{
cout << "Error! column of first matrix not equal to row of second.";
cout << "Enter rows and columns for first matrix: ";
cin >> r1 >> c1;
cout << "Enter rows and columns for second matrix: ";
cin >> r2 >> c2;
}
multi obj(r1, c1, r2, c2);
obj.matrix();
obj.multip();
return 0;
}