multiplication of matrix.md

#include using namespace std;

int main() { int a[10][10], b[10][10], mult[10][10], r1, c1, r2, c2, i, j, k;

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;
}

// 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];
    }

// 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];
    if(j == c2-1)
        cout << endl;
}

return 0;

}