Program Nilai Akhir Mahasiswa

#include <iostream>

using namespace std;

int main(){
    system ("color 0A");

    float nilai_tugas, nilai_uts, nilai_uas, nilai_akhir;
    char ulang;

    cout << "====================================================="<< endl;
    cout << "Aplikasi Sederhana Menghitung Nilai Ujian Mahasiswa"<< endl;
    cout << "Nama : TEDY FAZRIN"<< endl;
    cout << "www.tedybearblog.tech"<< endl;
    cout << "====================================================="<< endl;

    awal:
    cout << endl << "Masukkan nilai tugas = ";
    cin >> nilai_tugas;

    cout << endl << "Masukkan nilai uts = ";
    cin >> nilai_uts;

    cout << endl << "Masukkan nilai uas = ";
    cin >> nilai_uas;

    nilai_tugas = nilai_tugas*0.3;
    nilai_uts = nilai_uts*0.3;
    nilai_uas = nilai_uas*0.4;

    nilai_akhir =  nilai_tugas + nilai_uts + nilai_uas;

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

    if(nilai_akhir > 80){
        cout << endl << "Hasil nilai akhir nya adalah = "<< nilai_akhir <<endl;
        cout << endl << "Dengan Grade = A"<< endl;
    }
    else if(nilai_akhir >= 80 || nilai_akhir > 60 ){
        cout << endl << "Hasil nilai akhir nya adalah = "<< nilai_akhir <<endl;
        cout << endl << "Dengan Grade = B"<< endl;
    }
    else if(nilai_akhir  >= 60 || nilai_akhir > 40){
        cout << endl << "Hasil nilai akhir nya adalah = "<< nilai_akhir <<endl;
        cout << endl << "Dengan Grade = C"<< endl;
    }
    else if(nilai_akhir >= 40 || nilai_akhir > 20){
        cout << endl << "Hasil nilai akhir nya adalah = "<< nilai_akhir <<endl;
        cout << endl << "Dengan Grade = D"<< endl;
    }
    else {
        cout << endl << "Hasil nilai akhir nya adalah = "<< nilai_akhir <<endl;
        cout << endl << "Dengan Grade = E"<< endl;
        }

    cout << endl << "Apakah ingin mengulang? [Y/N] = ";
    cin >> ulang;
    cout << endl << "====================================================="<< endl;
    if (ulang == 'Y' || ulang == 'y'){
        goto awal;
    }
    else cout << endl << "Selesai Terimakasih";

}