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C preprocessor introduction
1. C preprocessor introduction
2. Preprocessor
The C compiler also uses a preprocessor that processes the source program before the compiler gets access to the transformed program. The idea started in ALGOL 68 (a complex language) but became popular with C.
3. Directives
Some preprocessor directives, introduced by the hash character "
#" include the following in C.
#include header files (as modules)
#define to define preprocessor
#error for custom error messages (related to the compile)
#pragma for non-standard or compiler-specific directives.
#if, etc.
C also has a macro expansion capability that makes providing meaningful error messages more difficult.
4. Common directive
A common directive at the top of most C programs is the following.
#include
The
stdio stands for "
standard input output" and contains routines, such as
printf and
scanf to do fundamental input and output. If the directive is not present, the C compiler will not know the meaning of
printf or
scanf and will issue detected error messages.
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