What are the Pre Processor
| The pre-processing directives provide the ability to conditionally skip sections of source files, to report error and warning conditions, and to delineate distinct regions of source code. The term "pre-processing directives" is used only for consistency with C and C++ programming languages. In C#, there is no separate pre-processing step; pre-processing directives are processed as part of the lexical analysis phase.
A preprocessor directive mus |
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| t be only instruction on a line. Preprocessing directives are lines in your program that start with `#'. Whitespace is allowed before and after the `#'. The `#' is followed by an identifier that is the directive name. For example, `#define' is the directive
Types are:#if, #else, #elif, #endif, #define, #undef, #warning, #error, #line, #region, #endregion
They are used for: - Conditional compilation , Line control ,Error and Warning reporting. | |