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53 lines
1.4 KiB
Plaintext
53 lines
1.4 KiB
Plaintext
{{QBDLDATE:05-20-2022}}
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{{QBDLTIME:23:17:27}}
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The {{KW|WHILE...WEND}} statement is used to repeat a block of statements while the condition is met.
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{{PageSyntax}}
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:{{KW|WHILE}} {{Parameter|condition}}
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:.
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:.
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:.
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:{{KW|WEND}}
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{{PageDescription}}
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* {{Parameter|condition}} is a numeric expression used to determine if the loop will execute.
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* {{Parameter|statements}} will execute repeatedly while {{Parameter|condition}} is a non-zero value.
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* [[EXIT]] WHILE can be used for emergency exits from the loop in QB64 only.
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* A [[DO...LOOP]] can use the same DO WHILE condition to get the same results.
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* WHILE loops only run if the WHILE condition is True.
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{{Template:RelationalTable}}
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{{PageExamples}}
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''Example 1:'' Reading an entire file. Example assumes the program has a [[OPEN|file opened]] as #1
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{{CodeStart}}
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{{Cl|OPEN}} "Readme.txt" FOR {{Cl|INPUT (file mode)|INPUT}} AS #1
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{{Cl|WHILE...WEND|WHILE}} {{Cl|NOT}} {{Cl|EOF}}(1)
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{{Cl|_LIMIT}} 1 'limit line prints to one per second
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{{Cl|LINE INPUT (file statement)|LINE INPUT #}}1, text$
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IF {{Cl|INKEY$}} = {{Cl|CHR$}}(27) THEN {{Cl|EXIT}} {{Cl|WHILE}} 'ESC key exits
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{{Cl|PRINT}} text$
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{{Cl|WEND}}
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{{CodeEnd}}
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''Example 2:'' Clearing the keyboard buffer.
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{{CodeStart}}
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{{Cl|WHILE}} {{Cl|INKEY$}} <> "" : {{Cl|WEND}}
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{{CodeEnd}}
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{{PageSeeAlso}}
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* [[DO...LOOP]]
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* [[FOR...NEXT]]
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* [[UNTIL]] (condition)
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* [[_CONTINUE]]
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{{PageNavigation}}
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