/*
Nome: Mario
Cognome: Montanari

Moltiplicazione tra due matrici
*/

#include <iostream>
#include <cstdlib>
#include <array>
#include <ctime>
#include <iomanip>

#define NROW 2
#define NCOL 2
#define VMIN -5
#define VMAX 5

using namespace std;

void fillMatrix(int matrix[][NCOL], int nrow, int ncol);
void printMatrix(int matrix[][NCOL], int nrow, int ncol);
void multiplyMatrices(int matrix1[][NCOL], int matrix2[][NCOL], int result[][NCOL], int nrow, int ncol);

int main(void) {
    int matrix1[NROW][NCOL];
    int matrix2[NROW][NCOL];
    int result[NROW][NCOL];

    fillMatrix(matrix1, NROW, NCOL);
    fillMatrix(matrix2, NROW, NCOL);

    cout << "First Matrix: " << endl;
    printMatrix(matrix1, NROW, NCOL);

    cout << "Second Matrix: " << endl;
    printMatrix(matrix2, NROW, NCOL);

    multiplyMatrices(matrix1, matrix2, result, NROW, NCOL);

    cout << "Product of the Matrices: " << endl;
    printMatrix(result, NROW, NCOL);

    return 0;
}

void fillMatrix(int matrix[][NCOL], int nrow, int ncol) {
    srand(time(NULL));
	for (int i = 0; i < nrow; i++) {
        for (int j = 0; j < ncol; j++) {
            matrix[i][j] = rand() % (VMAX - VMIN + 1) + VMIN;
        }
    }
}

void printMatrix(int matrix[][NCOL], int nrow, int ncol) {
    for (int i = 0; i < nrow; i++) {
        cout << endl;
        for (int j = 0; j < ncol; j++) {
            cout << setw(5) << matrix[i][j];
        }
        cout << endl;
    }
    cout << endl << endl << endl;
}

void multiplyMatrices(int matrix1[][NCOL], int matrix2[][NCOL], int result[][NCOL], int nrow, int ncol) {
	for (int i = 0; i < nrow; i++) {
        for (int j = 0; j < ncol; j++) {
            result[i][j] = 0;
        }
    }

    for (int i = 0; i < nrow; i++) {
        for (int j = 0; j < ncol; j++) {
            for (int k = 0; k < ncol; k++) {
                result[i][j] = result[i][j] + matrix1[i][k] * matrix2[k][j];
            }
        }
    }
}