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A <while-statement> executes a sequence of statements as long as a specified pre-condition is True.
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while-statement = "While" boolean-expression EOS statement-block "Wend"
Runtime Semantics.
The <boolean-expression> is repeatedly evaluated until the value of an evaluation is the data value False. Each time an evaluation of the <boolean-expression> has the data value True, the <statement-block> is executed prior to the next evaluation of <boolean-expression>.