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58 lines
2.6 KiB
Markdown
58 lines
2.6 KiB
Markdown
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The [LINE INPUT](LINE-INPUT) statement requests a [STRING](STRING) keyboard entry from a program user.
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## Syntax
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> [LINE INPUT](LINE-INPUT) [;] "[text prompt or question]"{,|;} stringVariable$
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> [LINE INPUT](LINE-INPUT) ; stringVariable$
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## Parameter(s)
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* A [semicolon](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 stringVariable$.
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* Requires only one [STRING](STRING) variable to hold the entire text entry.
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## Description
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* Cannot use numerical [Variable Types](Variable-Types) variables or [comma](comma) separated variable lists for multiple entries.
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* Allows [comma](comma)s and [quotation mark](quotation-mark)s in the user input, unlike [INPUT](INPUT) where commas denote extra input values and quotes delimit strings.
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* The statement halts the program until an entry is made. Pressing Enter ends the entry and code execution resumes.
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* LINE INPUT does not trim off leading or trailing spaces in the string entry like [INPUT](INPUT) string returns.
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* Use [VAL](VAL) to convert string numbers and [&O](&O) (octal), [&H](&H) (hexadecimal) or [&B](&B) (binary) prefixed entries into numerical values.
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* Use [_DEST](_DEST) [_CONSOLE](_CONSOLE) before LINE INPUT statements to receive input from a [$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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## Example(s)
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Preventing screen roll after an input entry on the bottom 2 screen rows.
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```vb
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SCREEN 12
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COLOR 14: LOCATE 29, 2 ' place dursor at beginning of prompt liine
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PRINT "Enter a name to search for... "; 'print prompt on screen
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COLOR 15: LINE INPUT ; "", name$ ' get search name from user
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LOCATE 29, 2: PRINT SPC(78); ' erase previous prompt
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n$ = UCASE$(name$) ' convert search name to upper case
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COLOR 14' change foreground color to yellow
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LOCATE 29, 2: PRINT "Searching..."; 'print message
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SLEEP
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```
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```text
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Enter a name to search for... █
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```
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> *Explanation:* The red [semicolon](semicolon) after LINE INPUT acts like a semicolon after a [PRINT](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-mode)), [INPUT (file statement)](INPUT-(file-statement)), [LINE INPUT (file statement)](LINE-INPUT-(file-statement))
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* [INPUT](INPUT), [INPUT$](INPUT$) (keyboard input)
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* [COLOR](COLOR), [LOCATE](LOCATE)
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* [INKEY$](INKEY$)
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* [_KEYHIT](_KEYHIT), [_KEYDOWN](_KEYDOWN)
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