menghitung bujur sangkar C++

#include<stdio.h>
#include<conio.h>
#include<iostream.h>
main()
{
int sisi,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 sisi 1 :";cin>>sisi;
luas= sisi*sisi;
cout<<"\n nilai :"<<luas;
getch();
}