menghitung persegi panjang c++

#include<stdio.h>
#include<conio.h>
#include<iostream.h>
main()
{
int panjang,lebar,luas;
cout<<"\n No absen :30";
cout<<"\n Nim :12116511";
cout<<"\n Nama :Rizki amaludin";
cout<<"\n Kelas :12.1J.01";

cout<<"\n masukan nilai panjang :";cin>>panjang;
cout<<"\n masukan nilai lebar :";cin>>lebar;
luas= panjang*lebar;
cout<<"\n nilai :"<<luas;
getch();
}