static class

#include<iostream>
#include<cstdio>
#include<cstring>

using namespace std;

class myclass
{
  static int x;
public:
  void setx(int n)
  {
    x=n;
  }
  int getx()
  {
    return x;
  }

};

int myclass::x;

int main()
{
  myclass o1, o2;
  o1.setx(9);
  cout<<o1.getx()<<endl;
  cout<<o2.getx()<<endl;
}