Elmomc SimplIQ Software Manual Manual de usuario descargar pdf (Pagina 47)

SimplIQ Software Manual 4BThe SimplIQ User Programming Language

MAN-SIMSW (Ver. 1.4)

5-18

5.7.7 Switch Selection

Syntax:

switch (expression)

case (case_expression1)

…

statement1

…

case (case_expression2)

…

statement2

…

otherwise

…

statement

…

end

The switch statement causes an unconditional jump to one of the statements that is the

“switch body,” or to the last statement, depending on the value of the controlling

expression, the values of the case labels and the presence or absence of an otherwise label.

The switch body is normally a compound statement (although this is not a syntactic

requirement). Usually, some of the statements in the switch body are labeled with case

labels or with the otherwise label. Labeled statements are not syntactic requirements either,

but the switch statement is meaningless without them. The otherwise label can appear only

once, and must appear after at least one case label. In contrast to the case label, the

otherwise label cannot be followed by an expression for evaluation.

The switch and case expressions may be any logical and/or numerical expression. The case

expression in the case label is compared for equality with the switch expression. If the

switch expression and the case expression are equal, then this case is selected and the

statements between the matching case expression and the next case or otherwise label are

executed. After execution of the statements, a break keyword may appear. It is not

necessary a case statement to finish with a break, because after executing the statements, an

unconditional jump to the end of the switch is performed automatically, and the next case

statement is not executed.

If a number of case expressions match the switch expression, then the first matching case is

selected.

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Elmomc SimplIQ Software Manual Manual de usuario Pagina 47