Spondylitis is a group of inflammatory conditions that affect the joints in your spine. Spondylosis isn’t due to inflammation but rather the wear and tear of your spine. Spondylitis and spondylosis ...
Spondylosis is a general term for degenerative conditions that affect the disks, vertebrae, and joints in the back. Back pain is a common symptom. Spondylosis is a common age-related condition that ... What is the point of #define in C++?
define spondylosis, I've only seen examples where it's used in place of a "magic number" but I don't see the point in just giving that value to a variable instead. c++ - Why use #define instead of a variable - Stack Overflow The #define directive is a preprocessor directive; the preprocessor replaces those macros by their body before the compiler even sees it. Think of it as an automatic search and replace of your source code. A const variable declaration declares an actual variable in the language, which you can use... well, like a real variable: take its address, pass it around, use it, cast/convert it, etc.
define spondylosis, Oh ... The question is if users can define new macros in a macro, not if they can use macros in macros. As far as I know, what you're trying to do (use if statement and then return a value from a macro) isn't possible in ISO C... but it is somewhat possible with statement expressions (GNU extension). Since #define s are essentially just fancy text find-and-replace, you have to be really careful about how they're expanded. I've found that this works on gcc and clang by default: I know that this is a long time after the original query, but this may still be useful.
This can be done in GCC using the stringify operator "#", but it requires two additional stages to be defined first. #define XSTR(x) STR(x) #define STR(x) #x The value of a macro can then be displayed with: #pragma message "The value of ABC: " XSTR(ABC) See: 3.4 Stringification in the gcc online ...
