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The "switch," "case," and "default" statements |
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SwitchStatement ::= ‘switch’ S? ‘(‘ S? Expression S? ‘)’ S? BracedStatements The “switch” statement indicates the start of “switched” conditional statement execution. The expression is evaluated (must evaluate to char, short, or long type) and compared against the case labels within the braced statements. CaseLabel ::= ‘case’ S Constant S? ‘:’ A case label is composed of the text “case,” a constant, and a colon. If the constant matches the “switched” conditional expression, this is the label to which script execution jumps. Duplicate constants are not permitted within a single “switch” statement. Case labels are only valid in the immediate context of a switched control block. An error occurs if the statement appears in any other context. DefaultLabel ::= ‘default’ S? ‘:’ A default case label is composed of the text “default” and a colon. If the “switched” conditional expression does not match any other case label, this is the label to which script execution jumps. Only a single “default” statement is permitted within a single “switch” statement. A default case label is only valid in the immediate context of a switched control block. An error occurs if the statement appears in any other context.
See also: [Evaluation and null
statements] [The "goto" statement and text labels]
[The "return" statement] [The
"if" and "else" statements]
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