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In other words, when the compiler starts building your code, no #define statements or anything like that is left #define my_macro printf( \ i like %d types of cheese\n, \ 5 \ ) but you cannot do that with your first example A good way to understand what the preprocessor does to your code is to get hold of the preprocessed output and look at it.

What is the point of #define in c++ What are advantages/disadvantages for each method? 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.

Just do something like this

#ifdef use_const #define myconst const #else #define myconst #endif then you can write code like this Myconst int x = 1 Myconst char* foo = bar You'll need to complete a few actions and gain 15 reputation points before being able to upvote

Upvoting indicates when questions and answers are useful What's reputation and how do i get it Instead, you can save this post to reference later. 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 0 in c or c++ #define allows you to create preprocessor macros

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. #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.

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. Is it better to use static const variables than #define preprocessor Or does it maybe depend on the context

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