C++ Constructor not calling [duplicate]

Question

#include<iostream>  
using namespace std;  
class base {  
public:     
    base() {
        cout<<"Constructing base \n";
    }  
    virtual ~base() {
        cout<<"Destructing base \n";
    } 
};  
class derived: public base { 
public:    
    derived() {
        cout<<"Constructing derived \n";
    }    
    ~derived() {
        cout<<"Destructing derived \n";
    }
};   
int main(void) {
    derived d();     
    return 0; 
} 

Why in this program its not calling constructor?

Can Anyone explain?
.......

Answer 1

The problem is that you are declaring a function here:

// function d(), returns a derived object.
derived d();   

What you need is

derived d; // C++03, C++11

or

derived d{}; // C++11 only

This is an "interesting" aspect of C++, where anything that can be parsed as a function declaration will be (provided it is in a context where a function can be declared).

See more on variable initialization in GoTW #1 Variable initialization - or is it?.