Simple example of Callback Functions

Here is a simple example introducing to the concept of callbacks in C++. Function Pointers will be used implicitly in demonstrating this example.

//Program tested on Microsoft Visual Studio 2008 - Zahid Ghadialy
//Example showing how callback functions work in C++
#include<iostream>

using namespace std;

int adds(int a, int b)
{
  return a+b;
}

int subs(int a, int b)
{
  return a-b;
}

int DoIt(int x, int y, int (*c)(int, int))
{
  cout<<"DoIt : "<<c(x,y)<<endl;
  return 0;
}

int main()
{
  DoIt(3,4,adds);
  DoIt(4,3,subs);

  //subs by another name
  int (*minus)(int,int) = subs;
  DoIt(4,2,minus);

  return 0;
}