header « macro « C Q&A

1. Macro undeclared, but defined in header    stackoverflow.com

I'm facing a very weird problem. This is map.h:

#define MAP_WIDTH   256
#define MAP_HEIGHT  256

typedef struct {
    char exit_n;
    char exit_s;
    char ...

2. Macro definitions for headers, where to put them?    stackoverflow.com

When defining macros that headers rely on, such as _FILE_OFFSET_BITS, FUSE_USE_VERSION, _GNU_SOURCE among others, where is the best place to put them? Some possibilities I've considered include

1. At the top of the any ...

3. MACRO to capitalize first letter of a word in header.    bytes.com

I think I would be forced to ask why? and over how many files? For a small number of files then a text editor is probably your best bet. For more files you might be able to use an awk script to automate a lot of the process or a perl script. Ultimately you could write you own text processing program. ...

4. Correspondence between headers and macros    bytes.com

My understanding is that when you write a library then the header should be of the form #ifndef macro_corresponding_to_the_library #define macro_corresponding_to_the_library .. .. ...definitions... .. #endif This prevents the objects in the library to be defined more than once in case the header gets included more than once. Assuming that I got that correctly my question is whether there is some ...