getch c 2b 2b library

1#include<iostream.h>
2#include<conio.h>
3
4void main()
5{
6int a=10, b=20;
7int sum=0;
8clrscr();  // use clrscr() after variable declaration
9sum=a+b;
10cout<<"Sum: "<<sum;
11getch();
12}

1#include <conio.h>
2int getch();