switch case default



the expression must be of an integral type or of a class type for which there is an unambiguous conversion to integral type. integral promotion is performed as described in integral promotions. the switch statement body consists of a series of case labels and an optional default label. no two constant expressions in case 

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aller à case labels if they match, control is transferred to the switch section that contains the first matching case label. if no case label pattern matches the match expression, control is transferred to the section with the default case label, if there is one. if there is no default case, no statements in any switch section are  syntax. switch(expression) { case n: code block break; case n: code block break; default: code block }. this is how it works: the switch expression is evaluated once. the value of the expression is compared with the values of each case. if there is a match, the associated block of code is executed.

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the c standard is not explicit about this, but taking all facts together, it is perfectly valid. a case and default label are equivalent to a goto label. see .. labeled statements. especially interesting is , which enables the already mentioned duff's device: any statement may be preceded by a prefix  the body of a switch statement is known as a switch block. a statement in the switch block can be labeled with one or more case or default labels. the switch statement evaluates its expression, then executes all statements that follow the matching case label. you could also display the name of the month with ifthenelse 

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default: echo "thingy"; break; } ?> but if "case " represented a fairly common case (other than "everything else"), then it would be better to declare it explicitly, not only because it saves time by not having to test every other case first (in the current example, php finds 'case ' in the first switch in two tests, but in the second  si aucune clause case n'est trouvée, le programme recherche la clause optionnelle default et si elle existe, les instructions correspondantes sont exécutées. si cette clause optionnelle n'est pas utilisée, le programme continue son exécution après l'instruction switch . par convention, la clause default est 

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these c# examples cover the switch statement. it is possible to switch on value types and strings. the body of a switch statement may have an arbitrary number of case: labels, as long as the values of all constant_expressions are unique (after conversions/promotions). at most one default: label may be present (although nested switch statements may use their own default: labels or have case: labels 

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switch(expression) { case constantexpression : statement(s); break; optional case constantexpression : statement(s); break; optional you can have any number of case statements default : optional statement(s); }. the following rules apply to a switch statement −. the expression used in a switch statement 

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