Const after a function name

Here is a classic example of putting const after a function name. What this means is that this function will not modify any private members of this class.

//Program tested on Microsoft Visual Studio 2008 - Zahid Ghadialy
//This example shows what happens if const is put after a function
#include<iostream>

using namespace std;

class ABC
{
public:
  int func1(int a, int b);
  int func2(int a, int b) const;
private:
  int x,y;
};

int ABC::func1(int a, int b)
{
  x = a, y = b;
  cout<<"x = "<<x<<" and y = "<<y<<endl;
  return 0;
}

int ABC::func2(int a, int b) const
{
  //x = a, y = b; - NOT POSSIBLE, Compile Error
  cout<<"Cant change x and y"<<endl;
  return -1;
}

int main()
{
  ABC abc;
  abc.func1(3, 7);
  abc.func2(20, 40);
  return 0;
}

The output is as follows: