Call by address method in c language.

■ Program for swapping two numbers using      function 

#include<stdio.h>

#include<conio.h>

void swap(int *,int *);

void main()

{

int a,b;

clrscr();

printf("enter two numbers=");

scanf("%d%d",&a,&b);

swap(&a,&b);

getch();

}

void swap(int *a,int *b)

{

int temp;

temp=*a;

*a=*b;

*b=temp;

printf("a is=%d\n",*a);

printf("b is=%d",*b);

}

■》Output->

enter two numbers=4

                                      5

a is=5

b is=4