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switch statement

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switch statement
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Führt Code nach Wert eines ganzzahligen Argument
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Executes code according to value of an integral argument
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Dort eingesetzt, wo eine oder mehrere aus vielen Zweigen der Code nach einem ganzzahligen Wert ausgeführt werden müssen .
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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 ) {
case constant_expression1 :
statement1 (optional)
case constant_expression2 :
statement2 (optional)
... ... ...
case constant_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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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
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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) {
        case 1: std::cout << "1";
        case 2: std::cout << "2";   //execution starts at this case label
        case 3: std::cout << "3";
        case 4:
        case 5: std::cout << "45";
                break;              //execution of subsequent statements is terminated
        case 6: std::cout << "6";
    }
 
    std::cout << '\n';
 
    switch (i) {
        case 4: std::cout << "a";
        default: std::cout << "d"; //there are no applicable constant_expressions 
                                   //therefore default_statement is executed
    }
 
    std::cout << '\n';
 
    switch (i) {
        case 4: std::cout << "a";  //nothing is executed
    }
}

Output:

2345
d