Constructing Objects and Calling Member functions

Question

Here is my code

#include 

using namespace std;

class MyTestClass
{
    int MyTestIVar;

    public: 
        MyTestClass(void);
        int         


        

Answer 1

You have stumbled upon the most vexing parse.

The line

MyTestClass mTC();

is parsed as a function prototype of a function named mTC which has no arguments and returns an instance of MyTestClass.

Answer 2

MyTestClass mTC();    

Does not declare an object of the MyTestClass class, as you think.

It Actually, declares a function by the name of mTC which does not take any parameters and returns an MyTestClass object.

This is known as the Most Vexing Parse in c++.