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

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H. eine Zahl im Zahlensystem zur Basis 8). Oktale Konstanten können die Ziffern 0 bis 7 und ein führendes Minus- oder Pluszeichen enthalten. h. eine Zahl im Zahlensystem zur Basis 16). Hexadezimale Konstanten können die Ziffern 0 bis 9, die Buchstaben A bis F und ein führendes Minusoder Pluszeichen enthalten. Im Anhang C finden Sie eine umfassende Erläuterung der dezimalen und hexadezimalen Notation. Symbolische Konstanten Eine symbolische Konstante ist eine Konstante, die durch einen Namen (Symbol) im Programm dargestellt wird.

Unter normalen Umständen beginnt die Programmausführung bei der ersten Anweisung in main und endet mit der letzten Anweisung in dieser Funktion. 35 Die #include-Direktive (Zeile 2) Die #include-Direktive weist den C-Compiler an, den Inhalt einer so genannten Include-Datei während der Kompilierung in das Programm einzubinden. Eine Include-Datei ist eine separate Datei mit Informationen, die das Programm oder der Compiler benötigt. Zum Lieferumfang des Compilers gehören mehrere dieser Dateien (man spricht auch von Header-Dateien).

Ein Programm verwendet Variablen, um verschiedene Arten von Daten während der Programmausführung zu speichern. In C muss man eine Variable zuerst definieren, bevor man sie verwenden kann. Die Variablendefinition informiert den Compiler über den Namen der Variablen und den Typ der Daten, die die Variable aufnehmen kann. Das Beispielprogramm definiert in Zeile 4 mit der Anweisung int a,b,c; drei Variablen mit den Namen a, b und c, die jeweils einen ganzzahligen Wert aufnehmen. Mehr zu Variablen und Variablendefinitionen erfahren Sie am dritten Tag.

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