Medical News Today: What is the difference between primary and secondary dysmenorrhea? Primary dysmenorrhea is menstrual pain with no underlying medical cause. Secondary dysmenorrhea is menstrual pain that results from structural abnormalities or medical conditions of the reproductive ...
Period pain, or dysmenorrhea, refers to pain and cramping that occurs during or around menstruation. According to a 2014 review, anywhere between 16–91% of people who menstruate experience ... 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.
define dysmenorrhea, 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. Oh ... 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.
define dysmenorrhea, c++ - Why use #define instead of a variable - 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:
