C Preprocessor Directives

The C preprocessor is a microprocessor that is used by the compiler to transform your code before compilation. It is called micro preprocessor because it allows us to add macros.

Note: Proprocessor direcives are executed before compilation.

All preprocessor directives starts with hash # symbol.

Let's see a list of preprocessor directives.

• #include

• #define

• #undef

• #ifdef

• #ifndef

• #if

• #else

• #elif

• #endif

• #error

• #pragma