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50 lines
1.5 KiB
Text
50 lines
1.5 KiB
Text
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.
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* Use [[_CONTINUE]] to skip the remaining lines in the iteration without leaving the loop.
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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" {{Cl|FOR (file statement)|FOR}} {{Cl|INPUT}} {{Cl|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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{{Cl|IF}} {{Cl|INKEY$}} = {{Cl|CHR$}}(27) {{Cl|THEN}} {{Cl|EXIT 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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