Download C-Programmierung für Linux in 21 Tagen GERMAN by Lopo de Castro PDF

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Kontrollfragen 1. Worin besteht der Unterschied zwischen einer Integer-Variablen und einer Gleitkommavariablen? 2. Nennen Sie zwei Gründe, warum man eine Gleitkommavariable doppelter Genauigkeit (vom Typ double) anstelle einer Gleitkommavariablen einfacher Genauigkeit (Typ float) verwenden sollte. 3. Auf welche fünf Regeln des ANSI-Standards kann man sich immer verlassen, wenn man die Größen für Variablen reserviert? 4. Nennen Sie zwei Vorteile, die sich aus der Verwendung symbolischer Konstanten anstelle von literalen Konstanten ergeben.

Antwort: Viele Compiler erlauben das, ohne einen Fehler zu signalisieren. h. wenn der Maximalwert überschritten ist, beginnt die Zählung wieder von vorn. Wenn Sie zum Beispiel 32768 an eine vorzeichenbehaftete Integer-Variable (Typ signed int) zuweisen, enthält die Variable am Ende den Wert -32768. Und wenn Sie dieser Integer-Variablen den Wert 65535 zuweisen, steht tatsächlich der Wert -1 in der Variablen. Ziehen Sie den Maximalwert, den die Variable aufnehmen kann, vom zugewiesenen Wert ab. Damit erhalten Sie den Wert, der tatsächlich gespeichert wird.

Diese und andere Anweisungen kommen in der morgigen Lektion zur Sprache. Am Ende des Programms zeigen die Zeilen 30 und 31 die Ergebnisse für den Benutzer an. Was Sie tun sollten Verwenden Sie symbolische Konstanten, um Ihr Programm verständlicher zu formulieren. Was nicht Versuchen Sie nicht, den Wert einer Konstanten nach der Initialisierung erneut zuzuweisen. Zusammenfassung Die heutige Lektion hat sich mit numerischen Variablen beschäftigt, die man in einem C-Programm verwendet, um Daten während der Programmausführung zu speichern.

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