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[avr-gcc-list] life span of #define


From: Marlin Unruh
Subject: [avr-gcc-list] life span of #define
Date: Fri, 16 Aug 2002 16:25:29 -0600

Hi,

What is the life span of a #define or #include. Is it to the end of the C file that defined or included it?

Is the #define or #include stuff flushed before the next C files is analyzed? Somewhere I read that it is bad programming style to include include files from an include file. Is this TRUE?

Does someone know of a good source of info so I can get a grip on how the preprocessor works? I want to understand how to intellegently use the #define #ifdef #ifndef stuff, instead of tumbling around with it.

Thank You.

Marlin

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