preprocessor directive

listen to the pronunciation of preprocessor directive
Английский Язык - Английский Язык
A statement that begins with the pound sign (#) and contains instructions that the preprocessor interprets
In C and C++, a statement that begins with the number sign (#) and contains instructions that the preprocessor interprets
a command placed within a source code listing, that directs the compiler to do something before the rest of the source code is parsed and compiled