Operator Overloading in C++

#include<iostream.h>
class KARAN
{

private:
int k;

public:
KARAN():k(5)
{
}

void operator ++()
{
k=k+1;
}

void Display()
{
cout<<"Value is: "<<k;
}

};
int main()
{

KARAN g;
++g; /* operator function void operator ++() is called */
g.Display();
return 0;

}