c preprocessor pragma

by

C #pragma:

The #pragma is a preprocessor directive which is used to get additional information related to machine or operating-system features by the compiler.

Some of the commonly used #pragma directives are:

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

 

Syntax:

#pragma_directives identifiers

Example:

#include<stdio.h>  
 
void first() ;  
#pragma startup first 
#pragma exit first 
 
void main()
{  
printf("\nBye C.");  
}  
 
void first()
{  
printf("\nHello C.");  
}

Output

Hello C.
Bye C.