C++ | References | Question 6

Output of following C++ program?

#include<iostream>
using namespace std;

int main()
{
  int x = 10;
  int& ref = x;
  ref = 20;
  cout << "x = " << x << endl ;
  x = 30;
  cout << "ref = " << ref << endl;
  return 0;
}

(A)

x = 20
ref = 30

(B)

x = 20
ref = 20

(C)

x = 10
ref = 30

(D)

x = 30
ref = 30

Answer: (A)
Explanation: ref is an alias of x, so if we change either of them, we can see the change in other as well.
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