Preprocessor

Preprocessor

 Before  a C program is compiled,it is passed through the another  proram is called “Pre processor” The Pre processor works on the source code and creates ‘Expanded Source Code’, which is stored in  ‘*.I’.

This expanded source code is sent to compiler for compilation.

Pre processor directives begins with a  ‘# ‘ symbol.
 Some of the  pre processor directives are:
1.  Macro Expansion.
2. File Inclusion.