Preprocessor directives are instructions that we give to the compiler and compilers job is to compile code based on those instructions.

All preprocessor directives must begin with hash(#) sign, but do not need to end with semicolon(;) because they are not statements.

Preprocessor directives are not inherited and are file specific.

List of preprocessor directives:

#define
#undef
#if
#else
#elif
#endif
#warning
#error
#line
#region
#endregion
#pragma
#pragma warning
#pragma checksum

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