Question

What does the line int Test::i; does in the below program. Somebody Please Explain

// Assume that integers take 4 bytes.
#include<iostream>

using namespace std;   

class Test
{
  static int i;
  int j;
};

int Test::i;

int main()
{
    cout << sizeof(Test);
    return 0;
}

Answer 1

That’s the syntax for defining a static member of a class. It initializes Test::i to 0.

To give it another value, you can do

int Tent::i = 42;