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#define simply substitutes a name with its value #ifndef headerfile_h #define headerfile_h and at the end of the file is #endif what is the purpose of this? Furthermore, a #define 'd constant may be used in the preprocessor
What Is Memory Leak? How to Resolve it?
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 have been seeing code like this usually in the start of header files Is it better to use static const variables than #define preprocessor
Or does it maybe depend on the context
What are advantages/disadvantages for each method? The #define version is still a macro The code is expanded at the invocation site It has all the expected problems (with macros) including namespace pollution and unexpected parameter behaviour.
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
You could for example do an ifdef guard to initialize a variable in a macro but make sure it isn't declared twice I'm sure there are other possible use cases Besides, it's normal to give simplified examples when asking theoretical questions Pointing out there's a different way is kind of pointless for this kind of question.
Which one is better to use among the below statements in c Static const int var = 5 Or #define var 5 or enum { var = 5 }; My memory of how the c preprocessor works has atrophied significantly since then.i am writing a very sim.
What is define ( [ , function ]) in javascript
[duplicate] asked 12 years, 4 months ago modified 2 years, 9 months ago viewed 240k times
