Sum / Difference of numbers

The source code for program that can find sum / Difference of two numbers is given below, copy it in note pad and save it as “.cpp”.Then use suitable compiler to compile it.

/*
 *      
 *      Copyright 2011 techstream.org < techstream.org[at]gmail.com >
 *      
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *      
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *      
 */
 
# include 
# include //to use clear screen function

void main()

 {
   clrscr();
   int a,b,ans;  //two intiger variable required if second method is used
                    
   cout<<"Enter First Number";
   cin>>a;
   cout<<"Enter Second Number";
   cin>>b;
   
   ans=a+b;			//use "-" to find Difference
   cout<<"Product is:"<‹ans;  	// second method [cout<<"Product is:"<‹a+b; ] use "-" to find Difference
   getch();
   
 }'