C++ | Static Keyword | Question 1

Predict the output of following C++ program.

#include <iostream> 
using namespace std; 
  
class Test 
{ 
    static int x; 
public: 
    Test() { x++; } 
    static int getX() {return x;} 
}; 
  
int Test::x = 0; 
  
int main() 
{ 
    cout << Test::getX() << " "; 
    Test t[5]; 
    cout << Test::getX(); 
}

(A) 0 0
(B) 5 5
(C) 0 5
(D) Compiler Error

Answer: (C)

Explanation: Static functions can be called without any object. So the call “Test::getX()” is fine.

Since x is initialized as 0, the first call to getX() returns 0. Note the statement x++ in constructor. When an array of 5 objects is created, the constructor is called 5 times. So x is incremented to 5 before the next call to getX().

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