Wyznacznik macierzy 3x3

#include <cstdlib>
#include <iostream>
#include <stdio.h>

using namespace std;

int main(){
    int l[9];
    int r[7];
    int wynik;
    cout << "Wyznacznik macierzy 3x3 by Narzew\n";
    cout << "Podaj macierz 3x3:\n";
    for(int i=0;i<9;i++){
        cin >> l[i];
    }
    printf("|%d\t%d\t%d|\n|%d\t%d\t%d|\n|%d\t%d\t%d|\n",l[0],l[1],l[2],l[3],l[4],l[5],l[6],l[7],l[8]);
    r[1]= l[0]*l[4]*l[8];
    r[2]= l[3]*l[7]*l[2];
    r[3]= l[6]*l[1]*l[5];
    r[4]= l[6]*l[4]*l[2];
    r[5]= l[3]*l[1]*l[8];
    r[6]= l[0]*l[7]*l[5];
    cout << "A = "<< l[0] << "*" << l[4] << "*" << l[8] << "=" << r[1] << "\n";
    cout << "B = "<< l[3] << "*" << l[7] << "*" << l[2] << "=" << r[2] << "\n";
    cout << "C = "<< l[6] << "*" << l[1] << "*" << l[5] << "=" << r[3] << "\n";
    cout << "D = "<< l[6] << "*" << l[4] << "*" << l[2] << "=" << r[4] << "\n";
    cout << "E = "<< l[3] << "*" << l[1] << "*" << l[8] << "=" << r[5] << "\n";
    cout << "F = "<< l[0] << "*" << l[7] << "*" << l[5] << "=" << r[6] << "\n";
    wynik = r[1]+r[2]+r[3]-r[4]-r[5]-r[6];
    cout << "A+B+C-D-E-F = " << r[1] << "+" << r[2] << "+" << r[3] << "-" << r[4] << "-" << r[5] << "-" << r[6] << " = " << r[1]+r[2]+r[3] << "-" << r[4]+r[5]+r[6] << " = " << wynik;
    cout << "\nWynik wynosi: " << wynik << "\n";
    cin >> l[1];
    return 0;
}