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Message: [QUOTE="Michael Mair, post: 2435009"] It is more consistent #if defined FOO #elif defined BAR .... #else #endif In addition, you can do things like #if (defined __STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) (parens added for reading convenience) So, the #if defined style offers the same functionality and then some more. If you need this additional functionality, then you get more consistent code if using the second style. BTW: I think of #ifdef/#ifndef as syntactic sugar, as it is an unnecessary shorthand for #if defined/#if !defined... However, I am not very consistent in that as I like my header guards the good old way with #ifndef... ;-) -- in this case, it is entirely sufficient and means "header guards" to me. Cheers Michael [/QUOTE]