{{keywords>wiki library source code example reference}}
====== define ======

    Constants and Macros
<code c>
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

    #define identifier     replacement_name
    #define identifier(identifier_list)     replacement_name
</code>
===== C Example =====
<code c>
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */


#define ANSWER 42

int main(void){
   printf("the answer to life the universe and everything is %d \n", ANSWER );
}
</code>
==== output example ====

    the answer to life the universe and everything is 42