Decimal,Octal and Hexadecimal ( C++ )

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

main ()
{
int nilai;

cout<<"Nilai = ";cin>>nilai;
cout<<endl;
cout<<"Nilai ke Octal = "<<oct<<nilai<<endl;
cout<<"Nilai ke Hexadesimal = "<<hex<<nilai<<endl;
cout<<"Nilai ke Desimal = "<<dec<<nilai<<endl;

getch();
}