C++ | Constructors | Question 6

Output of following C++ code will be?

C++

#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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