Why ++ operator not incrementing in case of operator overloading in c++?

Answer 1

a++ alone would suffice, without the assignment. The ++ operator acts on its operand "on the spot", meaning you don't need to do any assigning. And a = a++ is undefined behavior, so you don't want to do that.

Try:

Class test
{
public:
   int a=10;
   void operator ++(int)
   {
      a++;
      cout<<a;
   }
}