If condition evaluates to a value that doesn't match any of the case: labels, and the default: label is not present, then none of the statements in the switch body is executed. If condition evaluates to a value that doesn't match any of the case: labels, and the default: label is present, control is transferred to the statement labeled with the default: label. If condition evaluates to a value that is equal to the value of one of constant-expressions, then control is transferred to the statement that is labeled with that constant-expression. At most one default: label may be present (although nested switch statements may use their own default: labels or have case: labels whose constants are identical to the ones used in the enclosing switch). 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). case: and default: labels are permitted in statement and break statement has special meaning.Īttr (optional) case constant-expression : statementĪ constant expression of the same type as the type of condition after conversions and integral promotions If the (possibly converted) type is subject to integral promotions, condition is converted to the promoted type.Īny statement (typically a compound statement). The value of condition must be of integral or enumeration type, or of a class type contextually implicitly convertible to an integral or enumeration type. a declaration of a single non-array variable of such type with a brace-or-equals initializer, in this case the value of condition is the value of the declared variable.an expression, in this case the value of condition is the value of the expression.Note that any init-statement must end with a semicolon, which is why it is often described informally as an expression or a declaration followed by a semicolon. a simple declaration, typically a declaration of a variable with initializer, but it may declare arbitrarily many variables or structured bindings.an expression statement (which may be a null statement " "). ![]() Write a function, getNumberExplanation(), that describes a number passed to it.Attr (optional) switch ( init-statement (optional) condition ) statement Although there's now physically more code, it's easier to read than loads of elseif blocks. The key benefit of using it is that it better expresses the programmer's intention when checking the values of a particular variable. Though switch is present in the code, you can always find a way to avoid it. And since no code is executed after return we can get rid of break:
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