Cpp- Program for call by reference

//Program for call by reference.
#include<iostream>
#include<conio.h>
int main()
{
clrscr();
void swap(int *a, int *b);
int x=10;
int y=20;
cout<<"\n\t\t\tOUTPUT";
cout<<"\n\t\t\t------------";
cout << "\n\t\tBefore swapping";
cout<<"\n\t\t\tx="<<x;
cout<<"\n\t\t\ty="<<y;
swap(&x, &y);
cout<<"\n\t\tswapping";
cout<<"\n\t\t\tx="<<x;
cout<<"\n\t\t\ty="<<y;
getch();
return 0;
}
void swap(int *a,int *b)
{
int temp;
temp=*a;
*a=*b;
*b=temp;
}
OUTPUT
--------------
Before swapping
x=10
y=20
After swapping
x=20
y=10
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