C++ | Misc C++ | Question 3

Predict the output of following C++ program

#include<iostream> 
using namespace std; 
  
union A { 
  int a; 
  unsigned int b; 
  A() { a = 10; } 
  unsigned int getb() {return b;} 
}; 
  
int main() 
{ 
    A obj; 
    cout << obj.getb(); 
    return 0; 
} 

(A) Compiler Error: union can’t have functions
(B) Compiler Error: can’t access private members of A
(C) 10
(D) garbage value

Answer: (C)

Explanation: Like struct and class, union can have methods. Like struct and unlike class, members of union are public by default.

Since data members of union share memory, the value of b becomes same as a.

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