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52 lines
2.6 KiB
Text
52 lines
2.6 KiB
Text
The [[LINE INPUT]] statement requests a [[STRING]] keyboard entry from a program user.
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{{PageSyntax}}
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: [[LINE INPUT]] [;] "[text prompt or question]"{,|;} {{Parameter|stringVariable$}}
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: [[LINE INPUT]] ; {{Parameter|stringVariable$}}
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{{Parameters}}
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* A [[semicolon]] immediately after LINE INPUT stops the cursor after the entry and prevents screen roll on the lowest two screen rows.
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* ''text prompt or question'' is optional, but quotes are necessary unless just a semicolon is used before the {{Parameter|stringVariable$}}.
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* Requires only one [[STRING|string]] variable to hold the entire text entry.
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{{PageDescription}}
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* Cannot use numerical [[type]] variables or [[comma]] separated variable lists for multiple entries.
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* Allows [[comma]]s and [[quotation mark]]s in the user input, unlike [[INPUT]] where commas denote extra input values and quotes delimit strings.
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* The statement halts the program until an entry is made. Pressing Enter ends the entry and code execution resumes.
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* LINE INPUT does not trim off leading or trailing spaces in the string entry like [[INPUT]] string returns.
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* Use [[VAL]] to convert string numbers and [[&O]] (octal), [[&H]] (hexadecimal) or [[&B]] (binary) prefixed entries into numerical values.
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* Use [[_DEST]] [[_CONSOLE]] before LINE INPUT statements to receive input from a [[$CONSOLE|console]] window.
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* '''Note: QB64''' will not remove CHR$(0) from the end of LINE INPUT string return values like QBasic did.
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{{PageExamples}}
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''Example:'' Preventing screen roll after an input entry on the bottom 2 screen rows.
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{{CodeStart}} '' ''
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{{Cl|SCREEN}} 12
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{{Cl|COLOR}} 14: {{Cl|LOCATE}} 29, 2 ' place dursor at beginning of prompt liine
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{{Cl|PRINT}} "Enter a name to search for... "; 'print prompt on screen
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{{Cl|COLOR}} 15: {{Cl|LINE INPUT}} {{text|;|red}} "", name$ ' get search name from user
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{{Cl|LOCATE}} 29, 2: {{Cl|PRINT}} {{Cl|SPC}}(78); ' erase previous prompt
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n$ = {{Cl|UCASE$}}(name$) ' convert search name to upper case
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{{Cl|COLOR}} 14' change foreground color to yellow
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{{Cl|LOCATE}} 29, 2: {{Cl|PRINT}} "Searching..."; 'print message
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{{Cl|SLEEP}}
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{{CodeEnd}}
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{{OutputStart}}{{text|Enter a name to search for...|#FFFF00}} █
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{{OutputEnd}}
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: ''Explanation:'' The {{text|red|red}} [[semicolon]] after LINE INPUT acts like a semicolon after a [[PRINT]], which keeps the print cursor on the same row.
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''See also:''
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* [[INPUT (file mode)]], [[INPUT (file statement)|INPUT #]], [[LINE INPUT (file statement)|LINE INPUT #]]
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* [[INPUT]], [[INPUT$]] {{text|(keyboard input)}}
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* [[COLOR]], [[LOCATE]]
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* [[INKEY$]]
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* [[_KEYHIT]], [[_KEYDOWN]]
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{{PageNavigation}}
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