program to show function call by reference

113./*Write a program to show function call by reference*/

#include<stdio.h>

#include<conio.h>

void main()

{

            int a;

            a=200;

            clrscr();

            printf("\na = %d",a);

            add(&a);

            printf("\nAFTER RETURN FROM FUNCTION a=%d",a);

            getch();

            }

            add(int*ptr)

            {

            *ptr = *ptr+200;

            printf("\nIN FUNCTION a=%d",*ptr);

            return;

}

OUTPUT

            a = 200

            IN FUNCTION a= 400

            AFTER RETURN FROM FUNCTION a= 400