Swaps two numbers using call by reference in C language.

 WAP to implement a function that swaps two numbers using call by reference.

#include<stdio.h>

#include<conio.h>

void swap(int*,int*);

void main()

{

  int a,b;

  clrscr();

  printf("\n Enter two numbers :\n");

  scanf("%d%d",&a,&b);

  printf("\n Before swapping a = %d and b = %d",a,b);

  swap(&a,&b);

  printf("\n After swapping a = %d and b = %d",a,b);

  getch();

}

void swap(int *m,int *n)

{

  int *t;

  *t=*m;

  *m=*n;

  *n=*t;

}

Output:

Enter two numbers:

10

20

Before swapping  a = 10 and b = 20

After swapping     a = 20 and b = 10