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What is the point of #define in c++ In the normal c or c++ build process the first thing that happens is that the preprocessor runs, the preprocessor looks though the source files for preprocessor directives like #define or #include and then performs simple operations with them. 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.
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The #define directive is a preprocessor directive 0 in c or c++ #define allows you to create preprocessor macros 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 width 10 is a preprocessor directive that allows you to specify a name (width) and its replacement text (10) The preprocessor parses the source file and each occurrence of the name is replaced by its associated text
The compiler never actually sees a macro name at all, what it sees is the replaced text. #define simply substitutes a name with its value Furthermore, a #define 'd constant may be used in the preprocessor You can use it with #ifdef to do conditional compilation based on its value, or use the stringizing operator # to get a string with its value.
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)
I've found that this works on gcc and clang by default: 23 so i read the interesting answers about what are the differences between constexpr and const but i was curious about are the differences between #define and constexpr I feel like constexpr is just a #define where the type can be chosen. I want to use the pi constant and trigonometric functions in some c++ program
I get the trigonometric functions with include <math.h> However, there doesn't seem to be a definition for pi i. I have been seeing code like this usually in the start of header files #ifndef headerfile_h #define headerfile_h and at the end of the file is #endif what is the purpose of this?
