C++ da Dikdörtgen Uygulaması

//www.ethemsulan.com
#include <cstdlib>
#include <iostream>
using namespace std;
class rec{
      double x,y,z;
      double hacim(){return x*y*z;}
      public:
             rec(int i=0,int j=0,int k=0){x=i;y=j;z=k;}
             double alan(){return 3.14*x*y*z;}
             void show(){cout<<hacim()<<endl;}
      };
int main(int argc, char *argv[])
{
    rec ob(5,12,6);
    ob.show();
    cout<<ob.alan()<<endl;
    //cout<<ob.hacim()<<endl; private oldugu icin 
    //in icinden erisemeyiz sadece kendi sinifindan erisiriz
    system("PAUSE");
    return EXIT_SUCCESS;
}