4. Function "Exit" should have a prototype Error

 Code:

#include<stdio.h>

#include<conio.h>

void main()

{

 int a;

 while(1)

 {

   printf("1.Menu\n2.exit");

   printf("\nEnter your choice::");

   scanf("%d",&a);

   switch(a)

   {

    case 1:printf("\nYour choice is Menu");

    break;

    case 2:exit(0);

   }

   getch();

 }

}

Error: Function exit() should have a prototype

• This type error occur due to missing library file.
•  So just add header file #include<stdlib.h>  in above program.
• Run  again program in turbo c++ and see output.

Note : Here we need compulsory add header file for standard library for use exit function.