Example program for default, parametrized and copy constructor

//Example program for default, parametrized and copy constructor
#include<iostream.h>
#include<conio.h>
class rational
{
 private:
  int nr,dr;
public:
 rational()
 {
   nr=22;
  dr=7;
 }
rational(int nr1,int dr1)
 {
   nr=nr1;
   dr=dr1;
 }
rational(int nr1)
 {
   nr=nr1;
   dr=nr1+1;
 }
rational(rational &a)
 {
   nr=a.dr;
   dr=a.nr;
 }

~rational()

{ 

 cout<<"obj. is lost\n";

}

void display()

{

 cout<<nr<<"/"<<dr<<endl;

}

};

void main()

{

 rational a,b(5,8),c(5);

 rational d(b); //or rational d=b;

rational f;

f=b;

rational &e=c;

a.display();

b.display();

c.display();

d.display();

e.display();

f.display();

getch();

}

Constructors and Destructors