Pernyataan Goto

/*
 Program Menu Makanan
 Author: Fernando D. H. Rotty
 Nim : 181021400222
*/

#include <iostream>
#include <conio.h>
using namespace std;
main()
{
int a,b,k,L,d,e;
 cout<<""<<endl;
 cout<<"#####################################"<<endl;
 cout<<" Fernando D. H. Rotty | 181021400222"<<endl;
 cout<<"#####################################"<<endl;
 cout<<""<<endl;
 cout<<""<<endl;
 cout<<"====================================="<<endl;
 cout<<"          Insomnia Foods"<<endl;
 cout<<"====================================="<<endl;
 cout<<""<<endl;
cout<<"   Menu Makanan        Harga"<<endl;
cout<<"1. Soto Ayam           Rp. 18.000"<<endl;
cout<<"2. Nasi Bakar          Rp. 10.000"<<endl;
cout<<"3. Mie Ayam            Rp. 11.000"<<endl;
cout<<"4. Nasi Goreng         Rp. 10.000"<<endl;
cout<<""<<endl;
cout<<"====================================="<<endl;
k:
cout<<"Masukan No Menu Pilihan : ";
cin>>a;
switch(a)
{ case 1 :
cout<<"Soto Ayam "<<endl;
cout<<"Masukan Jumlah Pesanan : ";
cin>>b;
k=18000*b;
cout<<"Total Harga Rp: "<<k<<""<<endl;
s1:
cout<<"Uang Pembayaran : ";
cin>>d;
if (d<18000){
cout<<"Uang yang Anda Masukan Kurang, Silahkan Input Pembayaran"<<endl;
goto s1;
}
else{
e=d-k;
cout<<"Kembali : "<<e<<""<<endl;
}
break;
case 2 :
cout<<"Nasi Bakar "<<endl;
cout<<"Masukan Jumlah Pesanan : ";
cin>>b;
k=10000*b;
cout<<"Total Harga Rp: "<<k<<""<<endl;
s2:
cout<<"Uang pembayaran : ";
cin>>d;
if (d<1000){
cout<<"Uang yang Anda Masukan Kurang, Silahkan Input Pembayaran"<<endl;
goto s2;
}
else{
e=d-k;
cout<<"Kembali : "<<e<<""<<endl;
}
break;
case 3:
cout<<"Mie Goreng "<<endl;
cout<<"Masukan Jumlah Pesanan : ";
cin>>b;
k=11000*b;
cout<<"Total Harga Rp: "<<k<<""<<endl;
s3:
cout<<"Uang pembayaran : ";
cin>>d;
if (d<11000){
cout<<"Uang yang Anda Masukan Kurang, Silahkan Input Pembayaran"<<endl;
goto s3;
}
else{
e=d-k;
cout<<"Kembali : "<<e<<""<<endl;
}
break;
case 4 :
cout<<"Nasi Goreng "<<endl;
cout<<"Masukan Jumlah Pesanan : ";
cin>>b;
k=8000*b;
cout<<"Total Harga Rp: "<<k<<""<<endl;
s4:
cout<<"Uang pembayaran : ";
cin>>d;
if (d<10000){
cout<<"Uang yang Anda Masukan Kurang, Silahkan Input Pembayaran"<<endl;
goto s4;
}
else{
e=d-k;
cout<<"Kembali : "<<e<<""<<endl;
}
break;
default:cout<<"Menu Pilihan Tidak Tersedia"<<endl;
}
cout<<"Mau Pesan Lagi Y/T : "<<endl;
L = getche ();
if (L == 'Y' || L == 'y')
cout<<endl;
goto k;
getch ();
}