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Cx51 User's Guide
Cx51 Introduction
Compiling Programs
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How #include Works
Including Files Once Only
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#define
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Advanced Programming
8051 Derivatives
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Library Reference
Appendix
#undef
The #undef directive un-defines a macro name.
#undef macro-name
#undef causes the previously defined macro macro-name to no longer be defined as a macro. If macro-name is not defined, #undef is ignored. Predefined macros are not affected by #undef.
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