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    switch statement

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    switch statement
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    Used where one or several out of many branches of code need to be executed according to an integral value.
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    Inhaltsverzeichnis

    [Bearbeiten]Syntax

    switch (expression) {
    caseconstant_expression1:
    statement1(optional)
    caseconstant_expression2:
    statement2(optional)
    ... ... ...
    caseconstant_expressionn:
    statementn(optional)
    default:default_statement(optional)

    }

    [Bearbeiten]Erklärung

    expression sind ein Ausdruck, umwandelbar in einen Integer-Wert sein .
    Original:
    expression shall be an expression, convertible to an integer value.
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    Alle constant_expressions sind konstante Ausdrücke, umwandelbar in einen Integer-Wert, die einzigartig in diesem switch Aussage sein
    Original:
    All constant_expressions shall be constant expressions, convertible to an integer value, which is unique within this switch statement
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    Wenn die expression ergibt einen Wert, der gleich dem Wert eines der definierten constant_expressioni die statementi (falls vorhanden) und allen nachfolgenden Aussagen (außer default_statement, falls vorhanden) werden ausgeführt. Wenn der Wert des expression mit keinem der constant_expressions wird die default_statement ausgeführt falls vorhanden .
    Original:
    If the expression evaluates to a value, equal to the value of one of the defined constant_expressioni, the statementi (if present) and all subsequent statements (except default_statement, if present) are executed. If the value of the expression does not match any of the constant_expressions, the default_statement is executed if present.
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    Es ist nützlich, zu beachten, dass, wenn die Ausführung der nachfolgenden Aussagen ist unerwünscht, die <div class="t-tr-text"> break-Anweisung
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    break statement
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    verwendet werden können. In diesem Fall wird die Ausführung des switch Anweisung beendet .
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    It is useful to note, that if the execution of subsequent statements is undesirable, the
    break-Anweisung
    Original:
    break statement
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    </div>     can be used. In that case the execution of the switch statement terminates.
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    [Bearbeiten]Keywords

    switch, case, default

    [Bearbeiten]Beispiel

    Der folgende Code zeigt einige Anwendungsfälle der Switch Aussage
    Original:
    The following code shows several usage cases of the switch statement
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    #include <iostream>   int main(){int i =2;switch(i){case1:std::cout<<"1";case2:std::cout<<"2";//execution starts at this case labelcase3:std::cout<<"3";case4:case5:std::cout<<"45";break;//execution of subsequent statements is terminatedcase6:std::cout<<"6";}   std::cout<<'\n';   switch(i){case4:std::cout<<"a";default:std::cout<<"d";//there are no applicable constant_expressions //therefore default_statement is executed}   std::cout<<'\n';   switch(i){case4:std::cout<<"a";//nothing is executed}}

    Output: 

    2345 d
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