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. ![]() If no match is found from all case statements, then it executes the code block from the default case. It goes on by comparing the result of expression one by one with all case values. The way to check the value of the simple variable, use the logical. After matching the value with the case statements, if a match is found, it executes the code or expression within that block and exits from the switch block. 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 switch.case statement is a useful conditional statement for many programming tasks. 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). If none of the case values match the expression, the default case is executed, ensuring that there's always a fallback action. case: and default: labels are permitted in statement and break statement has special meaning.Īttrâ (optional) case constant-expression : statementĪ constant expression of the same type as the type of condition after conversions and integral promotions At its core, a switch statement contains a few fundamental components: the switch expression, which is evaluated, and multiple case statements, each representing a possible value. 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.
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