c-preprocessor – Page 24

Why does the C preprocessor interpret the word “linux” as the constant “1”?

September 4, 2022 by Tarik

In the Old Days (pre-ANSI), predefining symbols such as unix and vax was a way to allow code to detect at compile time what system it was being compiled for. There was no official language standard back then (beyond the reference material at the back of the first edition of K&R), and C code of … Read more

What is the difference between #include and #include “filename”?

August 23, 2022 by Tarik

What differs is the locations in which the preprocessor searches for the file to be included. #include <filename> The preprocessor searches in an implementation-defined manner, normally in directories pre-designated by the compiler/IDE. This method is normally used to include header files for the C standard library and other header files associated with the target … Read more