Overloading Basic Programming Concept in C++

#include<iostream.h>

#include<conio.h>

class PERIOD
{

    int days, months,years;

  public:

    void show();

    PERIOD(int d,int m,int y);

};

void PERIOD::show

{

    cout<<days<<months<<years<<endl;

}

PERIOD::PERIOD(int d,int m,int y)

{

    days=d;months=m;years=y;

}

int main () 
{

  clrscr();

  PERIOD p1(10,6,100);

  p1.show();

  PERIOD p2(p1);

  p2.show();

  getch();

  return 0;

}