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C251 User's Guide
C251 Introduction Compiling Programs Language Extensions 
Preprocessor Header Files 
How #include Works Including Files Once Only Macros Simple Macros Complex Macros Macro Operators Stringize (#) Token Pasting (##) Defined Predefined Macros Undefining and Redefining Macro Caveats Preprocessor Directives Conditional Compilation #define #elif #else #endif #error #if #ifdef #ifndef #include #line #message #pragma #undef #warning Advanced Programming Error Messages Library Reference AppendixPredefined Macros
The C251 Compiler provides the following predefined constants you may use in preprocessor directives and C code to create portable programs.
| Constant | Description |
|---|---|
| __C251__ | Version number of the compiler (for example, 401 for version 4.01). |
| __DATE__ | Date when the compilation was started in ANSI format (month dd yyyy). |
| __DATE2__ | Date when the compilation was started in short form (mm/dd/yy). |
| __FILE__ | Name of the file being compiled. |
| __LINE__ | Current line number in the file being compiled. |
| __MODEL__ | Memory model selected: |
| __TIME__ | Time when the compilation was started. |
| __STDC__ | Defined to 1 to indicate full conformance with the ANSI C Standard. |
| __FLOAT64__ | Defined to 0 to indicate that 32-bit floating-point numbers are used. Defined to 1 if the FLOAT64 directive is given either by invocation or #pragma. FLOAT64 changes the floating point math to double precision (64-bit). |
| __MODSRC__ | Defined to 0 if the binary mode of the 251 MCU is specified either by invocation or #pragma. Defined to 1 if the source mode of the 251 MCU is specified. |
Note
- There are two (2) leading and trailing underscore characters ('_') used for the predefined constants.
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