write a function using refrence variable as argument to swap the value of a pair of integers.

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

class swaping
{
int a;
public :
void getdata(void);
friend void swap(swaping &,swaping &);
void display(void);
};

void swaping :: getdata(void)
{
cout<<"\n\nEnter any Integer :-";
cin>>a;
}

void swap(swaping &o1,swaping &o2)
{
int temp;
temp    =    o1.a;
o1.a    =    o2.a;
o2.a    =    temp;
}

 void swaping :: display(void)
{
cout<<a<<endl;
}

void main()
{
clrscr();
swaping o1,o2;

cout<<"Before Swaping\n";
o1.getdata();
o2.getdata();

swap(o1,o2);

cout<<"\n\nAfter Swaping\n";
o1.display();
o2.display();

getch();
}