Program to illustrate copy constructor

#include<iostream.h>
#include<conio.h>

class Sample
{
int a;
float b;
public:
    Sample();  //constructor
    Sample(Sample &ptr);            // copy constructor
    void display();
};// end of class

Sample::Sample()
{
a=10;
b=20.75;
}
Sample::Sample(Sample &ptr)
{
a=ptr.a;
b=ptr.b;
}

void Sample::display()
{
cout<<"\na : "<<a<<endl;
cout<<"\nb : "<<b<<endl;
}
void main(void)
{
clrscr();
Sample s1;
s1.display();
Sample s2(s1);
s2.display();
getch();
}//end of main