AT&T 6300 Programmer's Manual page 499

Gwbasic by microsoft

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WHILE ... WEND

Loop through a series of statements as long as

a given condition remains true.

WHILE condition loop statements WEND

is a numeric, relational or logical expression. GWBASIC

determines whether the condition is true or false by testing

the result of the expression for non zero and zero, respec-

tively. A non zero result is true and a zero result is false.

Because of this, you can test whether the value of a variable

is non zero or zero by merely specifying the name of the

variable as a condition.

statements are executed until a WEND statement is

"condition" is not zero (i.e., true), "loop

statements" are executed until the WEND

statement is encountered. GWBASIC then

returns to the WHILE statement and checks

"condition". If it is still true, the process is

repeated. If it is zero (i.e. false), execution

resumes with the statement following the

WEND statement. WHILE/WEND loops may

be nested to any level. Each WEND will

match the most recent WHILE. An unmatched

WHILE statement causes a "WHILE without

WEND" error, and an unmatched WEND

statement causes a "WEND without WHILE"

Do not direct program flow into a

WHILE/WEND loop without entering

through the WHILE statement.

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