C Preprocessor Directives

The C preprocessor is a micro processor that is used by 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

What is Macro

Please visit next page.