Execute function before execution of main() function in C using #pragma directive

/*This Program demonstrates the use of #pragma directive.
  #pragma startup can be used to call a function before main.The function
  must not returning anything other than void and must not contain any
  arguments.
  
  Syntax : #pragma startup function-name [priority]
  Here function-name is the name of a function and priority is optional.
  priority can be from 64 to 255.Do not use priority from 0 to 63 because
  they are used by C libraries.
  100 is a Default priority
  255 is a lowest priority
  Developed on       :- 28/03/2009
  Developed by       :- Malhar Vora 
  Email              :- vbmade2000@gmail.com         
  WebSite            :- http://malhar2010.blogspot.com
  Development Status :- Completed
  
******************************************************************/


 #include 

void PrintChar1()
{
   printf("Hello before main1\n");
}

void PrintChar2()
{

   printf("Hello before main2\n");
}


#pragma startup PrintChar1 64
#pragma startup PrintChar2 65

void main()
{

   printf("Hello from Main");

}