Preprocessor instruction in C # pragma

The #pragma preprocessor directive is used to provide additional information to the compiler. The #pragma directive is used by the compiler to offer machine or operating-system feature.
Syntax:

#pragma token  
 
Different compilers can provide different usage of #pragma directive.
The turbo C++ compiler supports following #pragma directives.

#pragma argsused  
#pragma exit  
#pragma hdrfile  
#pragma hdrstop  
#pragma inline  
#pragma option  
#pragma saveregs  
#pragma startup  
#pragma warn  

 

Let's see a simple example to use #pragma preprocessor directive.

#include<stdio.h>  
#include<conio.h>  
  
void func() ;  
  
#pragma startup func  
#pragma exit func  
  
void main(){  
printf("\nI am in main");  
getch();  
}  
  
void func(){  
printf("\nI am in func");  
getch();  
}  

Output:

I am in func
I am in main
I am in func