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DO CASE
Execute one of several alternative blocks of statements
------------------------------------------------------------------------------
Syntax
DO CASE
CASE <lCondition1>
<statements>...
[CASE <lCondition2>]
<statements>...
[OTHERWISE]
<statements>...
END[CASE]
Arguments
CASE <lCondition> defines a block of statements to be executed if
<lCondition> evaluates to true (.T.).
OTHERWISE defines a block of statements to be executed if none of
the specified CASE conditions evaluates to true (.T.).
Description
DO CASE...ENDCASE is a control structure that executes one of several
blocks of statements depending on which of the associated conditions is
true (.T.). It works by branching execution to the statements following
the first CASE <lCondition> that evaluates to true (.T.). Execution
continues until the next CASE, OTHERWISE, or ENDCASE is encountered.
Control then branches to the first statement following the next ENDCASE
statement.
If none of the CASE conditions evaluates to true (.T.), the statements
following the OTHERWISE statement are executed up to the matching
ENDCASE statement. If an OTHERWISE statement is omitted, control
branches to the first statement following the matching ENDCASE
statement.
You may nest any number of statements, including other control
structures (i.e., DO WHILE and FOR), within a single DO CASE structure.
In addition, within a single DO CASE structure, there is no fixed limit
on the number of CASE statements that a DO CASE structure may contain.
DO CASE...ENDCASE is identical to IF...ELSEIF...ENDIF with neither
syntax having a specific advantage over the other.
Examples
. This example uses DO CASE in a menu structure to branch
control based on user selection:
@ 3, 25 PROMPT "First choice"
@ 4, 25 PROMPT "Second choice"
MENU TO nChoice
//
DO CASE
CASE nChoice = 0
RETURN
CASE nChoice = 1
ChoiceOne()
CASE nChoice = 2
ChoiceTwo()
ENDCASE
See Also:
BEGIN SEQUENCE
DO WHILE
FOR
IF
IF()
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