Program Kasir

Assalamualaikum bro....
nih saya kasih codingan aplikasi kasir, nah bedanya dengan aplikasi yang lain yaitu di program ini terdapat converter dari angka ke kata, penasaran??? nih codingnya

#include<stdio.h>
#include<conio.h>
#include<iostream>
using namespace std;

void satuan(int x) //satuan
{
if(x==1)cout<<" Satu ";
else if(x==2)cout<<" Dua ";
else if(x==3)cout<<" Tiga ";
else if(x==4)cout<<" Empat ";
else if(x==5)cout<<" Lima ";
else if(x==6)cout<<" Enam ";
else if(x==7)cout<<" Tujuh ";
else if(x==8)cout<<" Delapan ";
else if(x==9)cout<<" Sembilan ";
else if(x==10)cout<<" Sepuluh ";
else if(x==11)cout<<" Sebelas ";
}

void terbilang(long y)
{
if (y<=11) satuan(y);
else if ((y>11)&&(y<=19)) //belasan
{
terbilang(y%10);
cout<<"Belas";
}
else if ((y>=20)&&(y<=99)) //puluhan
{
terbilang(y/10);
cout<<"Puluh";
terbilang(y%10);
}
else if ((y>=100)&&(y<=199)) //seratus
{
cout<<" Seratus";
terbilang(y%100);
}
else if ((y>=200)&&(y<=999)) //Ratusan
{
terbilang(y/100);
cout<<"Ratus";
terbilang(y%100);
}
else if ((y>=1000)&&(y<=1999)) //seribu
{
cout<<" Seribu";
terbilang(y%1000);
}
else if ((y>=2000)&&(y<=999999)) //Ribuan
{
terbilang(y/1000);
cout<<" Ribu";
terbilang(y%1000);
}
else if ((y>=1000000)&&(y<=1999999)) //sejuta
{
cout<<" Sejuta";
terbilang(y%1000000);
}
else if ((y>=2000000)&&(y<=999999999)) //Jutaanan
{
terbilang(y/1000000);
cout<<" Juta";
terbilang(y%1000000);
}
else { cout<<"Error"; }
}

main()
{
unsigned long nilai;
int jp, produk;
char ukuran, lagi;
unsigned long total, harga, kembalian, pem;
do{
printf("\n\t++++ Aplikasi Kasir ++++\n");
printf("+--------------------------------------------------+\n");
printf("|NO \tNama Produk \tUkuran \t\tHarga      |\n");
printf("+--------------------------------------------------+\n");
printf("|1 \tSepatu \t\tL \t\t100.000    |\n");
printf("|  \t       \t\tM \t\t80.000     |\n");
printf("|  \t       \t\tS \t\t70.000     |\n");
printf("+--------------------------------------------------+\n");
printf("|2 \tSandal \t\tL \t\t30.000     |\n");
printf("|  \t       \t\tM \t\t25.000     |\n");
printf("|  \t       \t\tS \t\t15.000     |\n");
    printf("+--------------------------------------------------+\n");
printf("|3 \tTas \t\tL \t\t200.000    |\n");
printf("|  \t       \t\tM \t\t150.000    |\n");
printf("|  \t       \t\tS \t\t100.000    |\n");
printf("+--------------------------------------------------+\n");
printf("\nPilih Nomer Produk \t: "); scanf("%d",&produk);

switch(produk){
case 1:
printf("\nPilih Ukuran \t\t: "); scanf("%s",&ukuran);
switch(ukuran){
case 'l':
harga=100000; break;
case 'm' :
harga=80000; break;
case 's':
harga=70000; break;}
break;

case 2:
printf("\nPilih Ukuran \t\t: "); scanf("%s",&ukuran);
switch(ukuran){
case 'l':
harga=30000; break;
case 'm':
harga=25000; break;
case 's':
harga=15000; break;}
break;

case 3:
printf("\nPilih Ukuran \t\t: "); scanf("%s",&ukuran);
switch(ukuran){
case 'l':
harga=200000; break;
case 'm':
harga=150000; break;
case 's':
harga=100000; break;}
break;

}
//angka
printf("\nJumlah Produk \t\t: "); scanf("%d",&jp);
total=jp*harga; //total biaya
printf("\nTotal Biaya \t: Rp.%d ", total);
printf("\nPembayaran \t: Rp."); scanf("%d",&pem);
kembalian=pem-total; //kembalian
printf("Kembalian \t: Rp.%d ", kembalian);
printf("\n+--------------------------------------------------+\n");

//text
cout<<"\nJumlah Produk \t: ";
nilai=jp;
terbilang(nilai);

cout<<"\nTotal Biaya \t: "; //kembalian text
nilai=total;
terbilang(nilai);
cout<<" Rupiah";

cout<<"\nPembayaran \t: "; //kembalian text
nilai=pem;
terbilang(nilai);
cout<<" Rupiah";

cout<<"\nKembalian \t: "; //kembalian text
nilai=kembalian;
terbilang(nilai);
cout<<" Rupiah";
printf("\n+--------------------------------------------------+\n");

printf("\n\n Terimakasih.... :)");
printf("\n\nMenghitung lagi ? y/n  :"); scanf("%s",&lagi);
}while (lagi=='y');
}

//jangan lupa pada dieditin ya