Menu Kantin Univ Mercu Buana

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

int main(){
    int menu, banyak, total_menu, total, uang_bayar, kembalian, diskon;
    cout << "Menu Kantin Univ Mercu Buana" << endl;
    cout << "1.) Ayam Geprek + Nasi + Es Susu Milo ( Rp. 15.000 )" << endl;
    cout << "2.) Ayam Penyet + Nasi + Es Teh ( Rp. 13.000 )" << endl;
    cout << "3.) Ayam Crispy + Nasi + Pepsi Dingin ( Rp. 14.000 )" << endl;
    cout << "4.) Ayam Bakar + Nasi Uduk + Es Teh ( Rp. 16.000 )" << endl;
    cout << "# Pilih Menu : "; cin >> menu;
    switch(menu){
        case 1:
            cout << "==========================================================================" << endl;
            cout << "[!] Kamu Memesan Paket 1 : Ayam Geprek + Nasi + Es Susu Milo ( Rp. 15.000 )" << endl;
            cout << "[T] Masukkan Jumlah Pesanan : "; cin >> banyak;
            total_menu = banyak * 15000;
            break;
        case 2:
            cout << "==========================================================================" << endl;
            cout << "[!] Kamu Memesan Paket 2 : Ayam Penyet + Nasi + Es Teh ( Rp. 13.000 )" << endl;
            cout << "[T] Masukkan Jumlah Pesanan : "; cin >> banyak;
            total_menu = banyak * 13000;
            break;
        case 3:
            cout << "==========================================================================" << endl;
            cout << "[!] Kamu Memesan Paket 3 : Ayam Crispy + Nasi + Pepsi Dingin ( Rp. 14.000 )" << endl;
            cout << "[T] Masukkan Jumlah Pesanan : "; cin >> banyak;
            total_menu = banyak * 14000;
            break;
        case 4:
            cout << "==========================================================================" << endl;
            cout << "[!] Kamu Memesan Paket 4 : Ayam Bakar + Nasi Uduk + Es Teh ( Rp. 16.000 )" << endl;
            cout << "[T] Masukkan Jumlah Pesanan : "; cin >> banyak;
            total_menu = banyak * 16000;
            break;
        default:
            cout << "Mohon Pilih Pesanan" << endl;
            exit (EXIT_FAILURE);
            break;
    }
    if(banyak > 5){
        total = total_menu * 0.2;
        diskon = total_menu - total;
        cout << "[+] Total : " << total_menu << endl;
        cout << "[!] Kamu mendapat diskon Rp." << total << endl;
        cout << "[+] Total Yang Harus Kamu Bayarkan adalah Rp." << diskon << endl;
        cout << "[R] Masukkan Uang Bayar : "; cin >> uang_bayar;
    }else if(banyak >= 3 && banyak <= 5){
        total = total_menu * 0.1;
        diskon = total_menu - total;
        cout << "[+] Total : " << total_menu << endl;
        cout << "[!] Kamu mendapat diskon Rp." << total << endl;
        cout << "[+] Total Yang Harus Kamu Bayarkan adalah Rp." << diskon << endl;
        cout << "[R] Masukkan Uang Bayar : "; cin >> uang_bayar;
    }else{
        diskon = total_menu;
        cout << "[+] Total Yang Harus Kamu Bayarkan adalah Rp." << diskon << endl;
        cout << "[R] Masukkan Uang Bayar : "; cin >> uang_bayar;
    }
    kembalian = uang_bayar - diskon;
    if(kembalian == 0){
        cout << "[T] Uang Bayar mu senilai Rp." << uang_bayar << endl;
    }else{
        cout << "[T] Uang Bayar mu senilai Rp." << uang_bayar << endl;
        cout << "[!] Kembalian mu senilai Rp." << kembalian << endl;
    }
    cout << "[!] Terima Kasih Telah Berkunjung!" << endl;
    cout << "==========================================================================" << endl;
    return 0;
}