password , lulus

#include <iostream>
#include <stdlib.h>
using namespace std;

main (){
    int percobaan = 0;
    char nama[50], mata_kuliah[30], dosen[50];
    long nim, uas, tugas, uts, nilai_akhir;
    string password, status, grade;
    do{
        cout << "[!] Masukkan password : "; cin >> password;
        percobaan = percobaan + 1;
        if (percobaan==3){
            cout << "Anda telah salah password 3x,Program berhenti !";
            exit(EXIT_FAILURE);
        }
    }while (password != "123");
    system("CLS");
        cout << "Selamat datang !!" << endl;
        cout << "Masukkan Nama anda : "; cin >> nama;
        cout << "Masukkan NIM anda : " ; cin >> nim;
        cout << "Masukkan Mata kuliah : "; cin >> mata_kuliah;
        cout << "Dosen anda : "; cin >> dosen;
        cout << "Masukkan nilai tugas : "; cin >> tugas;
        cout << "Masukkan nilai UAS : "; cin >> uas;
        cout << "Masukkan nilai UTS : "; cin >> uts;
        if (tugas > 60){
            status = "Lulus";
        }else{
            cout << " [!] Anda tidak lulus";
            exit(EXIT_FAILURE);
        }
    nilai_akhir = (tugas * 0.5) + (uts * 0.2) + (uas * 0.3);
    if (nilai_akhir > 85 && nilai_akhir < 100){
        grade = "A";
        status = "Lulus";
    }else if (nilai_akhir > 75 && nilai_akhir < 84){
        grade = "B";
        status = "Lulus";
    }else if (nilai_akhir > 60 && nilai_akhir < 74){
        grade = "C";
        status = "Lulus";
    }else if (nilai_akhir > 40 && nilai_akhir < 59){
        grade = "D";
        status = "Tidak Lulus";
    }else{
        grade = "E";
        status = " Tidak Lulus";
    }
    system("CLS");
    cout << "Nama : " << nama << endl;
    cout << "NIM : " << nim << endl;
    cout << "Mata kuliah : " << mata_kuliah << endl;
    cout << "Dosen anda : " << dosen << endl;
    cout << "Nilai Akhir anda : " << nilai_akhir << endl;
    cout << "Grade : " << grade << endl;
    cout << "Status : " << status << endl;
}