TUGAS FUNGSI C++

#include <conio.h>
#include <stdio.h>
#include <iostream.h>

float cek_saldo()
{return(1000000);}

float setoran_tunai(float setoran)
{return(setoran+1000000);}

float tarikan_tunai(float tarikan)
{return(1000000-tarikan);}

float transfer_uang(float transfer)
{return(1000000-transfer);}

main()
{

char lagi,no[20];
int i,pin;
float pilihan,setoran,tarikan,transfer,ceksal,setun,tartun,tu;

clrscr();
puts("\t\t***************************************\n");
puts("\t\t Selamat Datang Di ATM Tarik Uang Terus\n");
puts("\t\t***************************************\n\n");
printf("\t\t   Silahkan Masukan 6 Digit PIN Anda\n\n\t\t\t\t");
char szInput[6];
gets (szInput);
pin=strlen(szInput);

awal:
clrscr();
cout<<endl;
printf ("\t\t   PIN Anda Telah di Proses : ");
for(i=1;i<=pin;i++)
{printf("*");}
printf("\n\t\t\t   PIN Berhasil !!!\n\n");

puts("\n\n\t\t\t*************************");
puts("\t\t\t\tMenu ATM");
puts("\t\t\t*************************\n\n\n");
printf("1 -->  Cek Saldo\t\t\t");
printf("\t\tTarikan Tunai  <-- 3\n\n");
printf("2 -->  Setoran Tunai\t\t\t");
printf("\t\tTransfer Uang  <-- 4\n\n");
puts("\t\t\t\t5 --> Keluar\n\n");
cout<<"Silakan Masukan Pilhan Anda : ";cin>>pilihan;
cout<<endl;

clrscr();
if(pilihan==1)
{
cout<<"\n\n\tJumlah Saldo Anda\t\t: Rp "<<1000000<<endl;
}
else if(pilihan==2)
{
cout<<"\n\n\tMasukan Jumlah Setoran\t\t: Rp ";cin>>setoran;
printf("\n\tJumlah Saldo Anda\t\t: Rp %2.0f\n\n\n",setoran_tunai(setoran));
}
else if(pilihan==3)
{
cout<<"\n\n\tMasukan Jumlah Tarikan\t\t: Rp ";cin>>tarikan;
tartun=tarikan_tunai(tarikan);
cout<<"\n\tJumlah Saldo Anda\t\t: Rp "<<tartun<<endl<<endl<<endl;
}
else if(pilihan==4)
{
cout<<"\n\n\tMasukan Jumlah Transfer\t\t: Rp ";cin>>transfer;
cout<<"\n\tNo. Rekening\t\t\t: ";cin>>no;
tu=transfer_uang(transfer);
cout<<"\n\tJumlah Saldo Anda\t\t: Rp "<<tu<<endl<<endl<<endl;
}
else
{
goto akhir;}

cout<<"\n\n\nIngin Input Lagi [Y/T] : ";cin>>lagi;
if(lagi=='Y'||lagi=='y')
goto awal;
else if(lagi=='T'||lagi=='t')
goto akhir;

getch();
akhir:
}