C++ | Constructors | Question 6

#include<iostream> 
using namespace std; 
  
class X  
{ 
public: 
    int x; 
}; 
  
int main() 
{ 
    X a = {10}; 
    X b = a; 
    cout << a.x << " " << b.x; 
    return 0; 
} 

(A) Compiler Error
(B) 10 followed by Garbage Value
(C) 10 10
(D) 10 0

Answer: (C)

Explanation: The following may look like an error, but it works fine.

X a = {10};

Like structures, class objects can be initialized.

The line “X b = a;” calls copy constructor and is same as “X b(a);”. Please note that, if we don’t write our own copy constructor, then compiler creates a default copy constructor which assigns data members one object to other object.

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