Kalimatriks

#include<iostream>
using namespace std;

int main(){
    int r1,r2,c1,c2;
    //Input Baris Matris A
    cout << "Input Baris Matriks A : ";
    cin >> r1;

    //Input Kolom Matriks A
    cout << "Input Kolom Matriks Pertama : ";
    cin >> c1;

    //Input Baris Matriks B
    cout << "Input Baris Matriks Kedua : ";
    cin >> r2;

    //Input Kolom Matriks B
    cout << "Input Kolom Matriks Kedua : ";
    cin >> c2;

    int A[r1][c1];
    int B[r2][c2];
    int C[10][10];

    //Cek Apakah Jumlah Kolom Matriks A Sama Atau Tidak Dengan Jumlah Baris Matriks B
    if(c1 != r2){
        cout << "Nilai dari Kolom Pertama Harus Sama Dengan Baris Kedua ";
        return 0;
    } else {
        cout << endl << "===============================" << endl;
        //Input Nilai Matriks A
        cout << "Input Nilai Matriks A : " << endl;
        for (int r=0; r < r1; r++){
            for (int c=0; c < c1; c++){
                cout << "A[" << r << "][" << c << "] = ";
                cin >> A[r][c];
            }
        }

        cout << endl << "===============================" << endl;
        //Input Nilai Matriks B
        cout << "Input Nilai Matriks B : " << endl;
        for (int r=0; r < r2; r++){
            for (int c=0; c < c2; c++){
                cout << "B[" << r << "][" << c << "] = ";
                cin >> B[r][c];
            }
        }

        //Operasi Perkalian
        int kali = 0;
        for (int r=0; r < r1; r++){
            for (int c=0; c < c2; c++){
                for (int n=0; n < r2; n++){
                    kali = kali + A[r][n] * B[n][c];
                }
                C[r][c] = kali;
                kali = 0;
            }
        }
        cout << endl << "===============================" << endl;

        //Output Nilai Matriks A
        cout << "Matriks A : " << endl;
        for(int r=0; r < r1; r++){
            cout << endl;
            for (int c= 0; c < c1; c++){
                cout << "\t" << A[r][c] << "\t";
            }
        }

        cout << endl << "===============================" << endl;

        //Output Nilai Matriks B
        cout << "Matriks B : " << endl;
        for(int r=0; r < r2; r++){
            cout << endl;
            for (int c= 0; c < c2; c++){
                cout << "\t" << B[r][c] << "\t";
            }
        }
        cout << endl << "===============================" << endl;
        //Output Nilai Matriks C
        cout << "Matriks A * Matriks B = Matriks C " << endl;
        for(int r=0; r < r1; r++){
            cout << endl;
            for (int c= 0; c < c1; c++){
                cout << "\t" << C[r][c] << "\t";
            }
        }
        cout << endl << "===============================" << endl;
    }
    return 0;
}