Erosive gastritis leads to inflammation and damage in the stomach lining. Blood test, stool tests, or endoscopic procedures help diagnose erosive gastritis. Avoiding alcohol or drinking in moderation ...
What is the point of #define in C++? 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 In other words, when the compiler starts building your code, no #define statements or anything like that is left. A good way to understand what the preprocessor does to your code is to get hold of the preprocessed output and look at it.
define gastritis and provide the word parts, c++ - What does ## in a #define mean? - Stack Overflow The question is if users can define new macros in a macro, not if they can use macros in macros. 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...
define gastritis and provide the word parts, well, like a real variable: take its address, pass it around, use it, cast/convert it, etc. Oh ... 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:
