Check out example codes for "getch c++ library". It will help you in understanding the concepts better.

Code Example 1

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

void main()
{
int a=10, b=20;
int sum=0;
clrscr();  // use clrscr() after variable declaration
sum=a+b;
cout<<"Sum: "<<sum;
getch();
}

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