What is #pragma

Question

preprocessor

Answer 1

it's a faster #ifndef #define preprocessor. it's to make sure that you're not including headers twice which can result in some funky errors. the difference between the two is that all compilers recognize #ifndef, #define so it's fail proof. but not all compilers recognize #pragma, but it's a bit faster and neater

Answer 2

As I know, it's a preprocessor with very many neat functions.

Answer 3

note that it is not supported by default by all popular compilers.