Static function and static variable

#include <iostream>
using namespace std;

class MyClass {
  static int i;
public:
  static void init(int x) {
     i = x;
  }
  void show() {
     cout << i;
  }
};

int MyClass::i;

int main()
{
  // init static data before object creation
  MyClass::init(30);

  MyClass x;
  x.show();

  return 0;
}

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3.	Static member functions: 'preinitialize' private static data
4.	A static member variable example.
5.	Use a static member variable independent of any object.
6.	Init static data before object creation
7.	A shared resource example.
8.	Usage and effect of a static data member

Static function and static variable : Static « Language « C++

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