This is a control declaration eligibility allows some specific group of reports to be selected from a number of groups are available. It is a multi-dimensional essential condition the command ' if else ' statement. A conversion report allows a single variable to be compared with a number of cases the label may be, is represented by a constant value. If turning the match with one of the constants, then a jump is made to be done up to that point. A case label cannot appear more than once and can only have one default expressions
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