C/C++ Pre-processor Commands
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| #, ## | manipulate strings |
| #define | define variables |
| #error | display an error message |
| #if, #ifdef, #ifndef, #else, #elif, #endif | conditional operators |
| #include | insert the contents of another file |
| #line | set line and file information |
| #pragma | implementation specific command |
| #undef | used to undefine variables |
| Predefined preprocessor variables | miscellaneous preprocessor variables |