static datamedlem

Kode 

#include <iostream>
#include <iomanip>
using namespace std;

class TestClass
{
public:
   static int objects;
private:
   TestClass();
   void writeObjects();
};


TestClass::TestClass()
{
    yValue = 10;
    objects++;
}


void TestClass::writeObjects()
{
  cout << objects << endl;
}

void TestClass::changeValue(int value)
{
  yValue = value;
}
//hvorfor skal man skrive typen?
int TestClass::objects = 0;