Days, Months, Years Program to show Copy Constructor in C++

#include<iostream.h>

#include<conio.h>

class PERIOD

{

    int days, months,years;

  public:

    void show();

    PERIOD(int d,int m,int y);

    PERIOD(const PERIOD &);

};

void PERIOD::show()

{

      cout<<days<<months<<years<<endl;

}

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

{

      days=d;months=m;years=y;

}

PERIOD::PERIOD(const PERIOD &tmp)

{

      cout<<"Copied"<<"\n";

      days=tmp.days;months=tmp.months;years=tmp.years;

}

int main ()

{

clrscr();

   PERIOD p1(10,6,100);

   p1.show();

   PERIOD p2(p1);

   p2.show();

  getch();

  return 0;

}

Copy Constructor # 2

/* This program creates a "safe" array class. Since space

for the array is allocated using new, a copy constructor

is provided to allocate memory when one array object is

used to initialize another.

*/

#include <iostream.h>

#include <conio.h>

//using namespace std;

class array

{

      int *p;

      int size;

      public:

      array(int sz)

      {

            p = new int[sz];

            size = sz;

      }

      ~array()

      {

            delete [] p;

      }

// copy constructor

      array(const array &a);

      void put(int i, int j)

      {

            if(i>=0 && i<size) p[i] = j;

      }

      int get(int i)

      {

            return p[i];

      }

};

// Copy Constructor

array::array(const array &a)

{

      int i;

      p = new int[a.size];

      for(i=0; i<a.size; i++) p[i] = a.p[i];

}

int main()

{

      clrscr();

      array num(10);

      int i;

      for(i=0; i<10; i++) num.put(i, i);

      for(i=9; i>=0; i--) cout << num.get(i);

      cout << "\n";

      // create another array and initialize with num

      array x(num); // invokes copy constructor

      for(i=0; i<10; i++) cout << x.get(i);

      getch();

      return 0;

}