I know that the first is a declaration, and the second is an assignment:What does it mean by "if an identifier is defined"? Has it been declared and assigned or just declared?Code:int a; a = 1;
Question is regarding macro directives: #ifdef and defined
Perhaps give an example of what you are having issues with, unfortunately C has "overloaded definitions" of 'define'.
http://c-faq.com/decl/decldef.html
[edit]Code:#include <stdio.h> #define FOO /* comment this out, compile, and compare */ #if defined FOO const char text[] = "foo"; #else const char text[] = "bar"; #endif int main() { puts(text); return 0; }
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
