#include 
using namespace std;

void enterData(int firstMatrix[][10], int secondMatrix[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond);
void multiplyMatrices(int firstMatrix[][10], int secondMatrix[][10], int multResult[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond);
void display(int mult[][10], int rowFirst, int columnSecond);

int main()
{
    int firstMatrix[10][10], secondMatrix[10][10], mult[10][10], rowFirst, columnFirst, rowSecond, columnSecond, i, j, k;

    cout << "Enter rows and column for first matrix: ";
    cin >> rowFirst >> columnFirst;

    cout << "Enter rows and column for second matrix: ";
    cin >> rowSecond >> columnSecond;

    // If colum of first matrix in not equal to row of second matrix, asking user to enter the size of matrix again.
    while (columnFirst != rowSecond)
    {
        cout << "Error! column of first matrix not equal to row of second." << endl;
        cout << "Enter rows and column for first matrix: ";
        cin >> rowFirst >> columnFirst;
        cout << "Enter rows and column for second matrix: ";
        cin >> rowSecond >> columnSecond;
    }

    // Function to take matrices data
        enterData(firstMatrix, secondMatrix, rowFirst, columnFirst, rowSecond, columnSecond);

        // Function to multiply two matrices.
        multiplyMatrices(firstMatrix, secondMatrix, mult, rowFirst, columnFirst, rowSecond, columnSecond);

        // Function to display resultant matrix after multiplication.
        display(mult, rowFirst, columnSecond);

    return 0;
}

void enterData(int firstMatrix[][10], int secondMatrix[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond)
{
    int i, j;
    cout << endl << "Enter elements of matrix 1:" << endl;
    for(i = 0; i < rowFirst; ++i)
    {
        for(j = 0; j < columnFirst; ++j)
        {
            cout << "Enter elements a"<< i + 1 << j + 1 << ": ";
            cin >> firstMatrix[i][j];
        }
    }

    cout << endl << "Enter elements of matrix 2:" << endl;
    for(i = 0; i < rowSecond; ++i)
    {
        for(j = 0; j < columnSecond; ++j)
        {
            cout << "Enter elements b" << i + 1 << j + 1 << ": ";
            cin >> secondMatrix[i][j];
        }
    }
}

void multiplyMatrices(int firstMatrix[][10], int secondMatrix[][10], int mult[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond)
{
    int i, j, k;

    // Initializing elements of matrix mult to 0.
    for(i = 0; i < rowFirst; ++i)
    {
        for(j = 0; j < columnSecond; ++j)
        {
            mult[i][j] = 0;
        }
    }

    // Multiplying matrix firstMatrix and secondMatrix and storing in array mult.
    for(i = 0; i < rowFirst; ++i)
    {
        for(j = 0; j < columnSecond; ++j)
        {
            for(k=0; k

Enter rows and column for first matrix: 3
2
Enter rows and column for second matrix: 3
2
Error! column of first matrix not equal to row of second.

Enter rows and column for first matrix: 2
3
Enter rows and column for second matrix: 3
2

Enter elements of matrix 1:
Enter elements a11: 3
Enter elements a12: -2
Enter elements a13: 5
Enter elements a21: 3
Enter elements a22: 0
Enter elements a23: 4

Enter elements of matrix 2:
Enter elements b11: 2
Enter elements b12: 3
Enter elements b21: -9
Enter elements b22: 0
Enter elements b31: 0
Enter elements b32: 4

Output Matrix:
24 29

6  25