Day#39 'C' Coding Challenge

What are preprocessor operators in C?

Following are the preprocessor operators in C:

• Stringizing Operator (#)
• Token-Pasting Operator (##)
• Macro Continuation Operator (/)

Stringizing Operator (#):

When this parameter is used along with Macro in it's parameter definition, it converts that parameter into string. Example as below:

#include<stdio.h>

#define wesbite_name(name) #name 

int main()

{

printf("%s",wesbite_name(Embeddeddesignblog));

return 0;

}

Token-Pasting Operator (##):

Token pasting helps to combine parameters in a Macro. For example, in the below code, pagecount and n are combined using token-pasting. They are seen as single parameter by the compiler.

#include <stdio.h>

#define website_pages(n) printf ("pagecount" #n " = %d", pagecount##n)

int main() 

{

   int pagecount_1 = 5;

   website_pages(_1);

   return 0;

}

Macro Continuation Operator (/):

A macro extends over a single line. If we want to write the same macro extending over two lines, '/' need to be used.

#define website_pages(n) /

printf ("pagecount" #n " = %d", pagecount##n)