program to swap by using pass by address

#include<iostream.h>
#include<conio.h>
void main()
{
    int a,b;
    clrscr();
    void swap(int *,int *);
    cout<<"enter the value of a and b ";
    cin>>a>>b;
    swap(&a,&b);
    cout<<"the value of a is "<<a<<" and b is "<<b;
    getch();
}
void swap(int *c,int *d)
{
    int a;
    a=*c;
    *c=*d;
    *d=a;
}