To swap two numbers using the concept of pointers (Call by reference)

/* Program to swap two numbers using call by reference */

#include<stdio.h>

#include<conio.h>

void swapr(int *x,int *y);

void main()

{

  int a=10,b=20;

  clrscr();

  swapr(&a,&b);

  printf("\na=%d and b=%d",a,b);

  getch();

}

 

void swapr(int *x,int *y)

{

  int temp;

  temp=*x;

  *x=*y;

  *y=temp;

  printf("\nx=%d and y=%d",*x,*y);

}

 

OUTPUT

 

x=20 and y=10

a=20 and b=10