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    Preprocessor

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    Preprocessor
     

    Der Prprozessor wird vor dem Compiler aufgerufen. Das Ergebnis des Prprozessors ist eine Datei, die an den Compiler weitergeleitet wird.

    Richtlinien

    Die Prprozessordirektiven steuern das Verhalten des Prprozessors. Jede Anweisung belegt eine Zeile und hat folgendes Format:

    • # Charakter
    • Prprozessorinstruktion (eine von define, undef, include, if, ifdef, ifndef, else, elif, endif, line, error, pragma)[1]
    • Argumente (abhngig von der Instruktion)
    • Zeilenumbruch

    Die Null-Richtlinie (# gefolgt von einen Zeilenumbruch) ist zulssig und hat keine Auswirkung.

    Fhigkeiten

    Die bersetzung der Quelldatei kann durch den Prprozessor wie folgt gesteuert werden:

    Das Verhalten des Prprozessors kann wie folgt gesteuert werden:
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    The following aspects of the preprocessor can be controlled:
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    Fussnoten

    1. Dies sind die Direktiven, die vomStandard definiert sind. Der Standard definiert kein Verhalten fr ander Direktiven: sie knen ignoriert werden, eine sinnvolle Bedeutung haben oder einen Copilerfehler erzeugen. Auch wenn sie ignoriert werden, werden sie vom Quellcode entfernt wenn die Verarbeitung des Prprozessors abgeschlossen ist. Eine hufige nicht standardisierte Erweiterung ist die #warning Direktive, die whrend der Compilation eine benutzerdefinierte Meldung ausgibt.
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