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CC78K4 датащи(PDF) 140 Page - NEC |
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CC78K4 датащи(HTML) 140 Page - NEC |
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140 / 523 page ![]() CHAPTER 9 PREPROCESSING DIRECTIVES (COMPILER DIRECTIVES) User’s Manual U15556EJ1V0UM 140 (3) #ifdef directive Conditional Translation Directives #ifdef FUNCTION The #ifdef directive is equivalent to: #if defined (identifier) If the identifier has been defined with the #define directive, the statements between #ifdef and #endif will be translated. If the identifier has never been defined or its definition has been canceled, the translation phase will skip the source code between #ifdef and #endif. SYNTAX #ifdef identifier line feed group EXAMPLE #define ON #ifdef ON : #endif EXPLANATION In the above example, the identifier “ON” has been defined with the #define directive. Thus, the source code between #ifdef and #endif will be translated. If the identifier “ON” has never been defined, the source code between #ifdef and #endif will be discarded. |
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