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

    Constants and Macros
<code cpp>    
#include <iostream> /* including standard library */

    #define identifier     replacement_name
    #define identifier(identifier_list)     replacement_name
</code>    
===== cpp Example 1 =====
<code cpp>
#include <iostream> /* including standard library */


#define ANSWER 42

using namespace std;

int main(void){
   cout << "the answer to life the universe and everything is " << ANSWER << endl;
}
</code>
==== output example 1 ====

    the answer to life the universe and everything is 42 
    
===== C Example 2 =====
<code cpp>
#include <iostream> /* including standard library */

#define ANSWER 42

using namespace std;

int print ( void )
{
   cout << "the answer to life the universe and everything is " << ANSWER << endl;
   return 0;
}

int main(void)
{
   print();
return 0;
}
</code>
==== output example 2 ====

    the answer to life the universe and everything is 42