The Department of Health is warning the public against fake endorsements of thyroid disease and goiter supplements circulating online. The agency said the advertisements, which appear on social media, ... 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 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 goiter disease, well, like a real variable: take its address, pass it around, use it, cast/convert it, etc. Oh ... 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. c++ - What does ## in a #define mean?
define goiter disease, - Stack Overflow 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:
