Call by value 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