The Preprocessor Reference explains the preprocessor as it is implemented in Microsoft C/C++. The preprocessor performs preliminary operations on C and C++ files before they are passed to the compiler. You can use the preprocessor to conditionally compile code, insert files, specify compile-time error messages, and apply machines-specific rules to sections of code.

• Preprocessor directives
• Preprocessor operators
• Pragmas
• Predefined macros

For additional reference material on C and C++, see:

• Language Quick Reference
• C++ Language Reference
• C Language Reference