Postfix Operator Overloading Error!

[basanta]

Gretting Codeguru World!
Recently, i successfully overloaded postfix operator to class counter by using Object and Class. Now, i want to overload same postfix operator to Inheritance. I created my code and generated in compiler. But, my compiler signaled me uncommon error(saw first time) and i couldn't generate any idea where my actually mistake is.

Here is my Code which objective is to count the number increasingly or decreasingly as per object created of CountDn class.

#include <iostream>

using namespace std;

class Counter                                       // base class
{
    protected :                                     // NOTE : Not Private
        unsigned int count;
    public :
        Counter() : count(0)                        // no arg constructor
        {}
        Counter(int c) : count(c)                   // one arg constructor
        {}
        unsigned int get_count() const              // return count
            {return count;}

        Counter operator ++()                       // increase count(postfix)
            {return Counter(count++);}

};

class CountDn : public Counter                      // derived class
{
    public :
        CountDn() : Counter()
        {}
        CountDn(int c) : Counter(c)
        {}
        CountDn operator --()                       // decrease count(postfix)
            {return CountDn(count--);}
};

int main()
{
    CountDn c1;
    CountDn c2;
    cout <<"\nC1 = "; c1.get_count();
    cout <<"\nC2 = "; c2.get_count();
    c1++;
    c2 = c1++;
    cout <<"\nC2 = "; c1.get_count();
    c2 = c1--;
    cout <<"\nC2 = "; c2.get_count();
    cout <<'\n';
    return 0;
}

Expecting some suggestion and Feedback

Regards
Basanta

Error : |41|error: no 'operator++(int)' declared for postfix '++', trying prefix operator instead|
|42|error: no 'operator++(int)' declared for postfix '++', trying prefix operator instead|
|42|error: no match for 'operator=' in 'c2 = c1.CountDn::<anonymous>.Counter:perator++()'|
|44|error: no 'operator--(int)' declared for postfix '--', trying prefix operator instead|

Plus : I have visited http://forums.codeguru.com/showthrea...ment-operators but, i still can't understand the code so i have to create this thread..