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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