C Preprocessor Directives:
The Preprocessor Directives are a part of C program which are executed before compilation, hence the name Preprocessor. These Preprocessor Directives are easily identified as they starts with hash # symbol. The preprocessors are also used to add macros in a C program.
Some of the Preprocessor Directives are;
- #include
- #define
- #undef
- #ifdef
- #ifndef
- #if
- #else
- #elif
- #endif
- #error
- #pragma
Example:
#include <stdio.h> void main() { printf("Hello C."); } |
Output
Hello C. |
