#506 – Using Expressions in #if and #elif Directives

You can use more complex expressions in #if and #elif directives, instead of just checking to see whether a single conditional compilation symbol is defined.

In the example below, the #elif directive triggers if the DOGSBARK symbol is defined and then DOGSGROWL symbol is not defined.

#define DOGSBARK
//#define DOGSWAG
//#define DOGSGROWL

using System;
using DogLibrary;

namespace ConsoleApplication1
    class Program
        static void Main()
            Dog d = new Dog("Kirby", 12);



You can build more complex expressions using parentheses and the && (logical AND) and || (logical OR) operators.


About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

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