How can I distinguish between prefix increment and postfix increment?

Prefix increment prototype syntax:
void operator ++();

Postfix increment prototype increment:
void operator ++(int);

Example:

class pre_post
{
public:
  void operator ++(void)
  {
    cout << "Prefix ++ called";
  }
    void operator ++(int)
  {
    cout << "Postfix ++ called";
  }
};
void main(int argc, char *argv[])
{
  pre_post b;
  b++;
  ++b;
}

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