LINE INPUT: Difference between revisions
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{{ | {{PageParameters}} | ||
* A [[semicolon]] immediately after LINE INPUT stops the cursor after the entry and prevents screen roll on the lowest two screen rows. | * A [[semicolon]] immediately after LINE INPUT stops the cursor after the entry and prevents screen roll on the lowest two screen rows. | ||
* ''text prompt or question'' is optional, but quotes are necessary unless just a semicolon is used before the {{Parameter|stringVariable$}}. | * ''text prompt or question'' is optional, but quotes are necessary unless just a semicolon is used before the {{Parameter|stringVariable$}}. | ||
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{{PageDescription}} | {{PageDescription}} | ||
* Cannot use numerical [[type]] variables or [[comma]] separated variable lists for multiple entries. | * Cannot use numerical [[Variable Types|type]] variables or [[comma]] separated variable lists for multiple entries. | ||
* Allows [[comma]]s and [[quotation mark]]s in the user input, unlike [[INPUT]] where commas denote extra input values and quotes delimit strings. | * Allows [[comma]]s and [[quotation mark]]s in the user input, unlike [[INPUT]] where commas denote extra input values and quotes delimit strings. | ||
* The statement halts the program until an entry is made. Pressing Enter ends the entry and code execution resumes. | * The statement halts the program until an entry is made. Pressing Enter ends the entry and code execution resumes. | ||
| Line 30: | Line 30: | ||
{{Cl|COLOR}} 14: {{Cl|LOCATE}} 29, 2 ' place dursor at beginning of prompt liine | {{Cl|COLOR}} 14: {{Cl|LOCATE}} 29, 2 ' place dursor at beginning of prompt liine | ||
{{Cl|PRINT}} "Enter a name to search for... "; 'print prompt on screen | {{Cl|PRINT}} "Enter a name to search for... "; 'print prompt on screen | ||
{{Cl|COLOR}} 15: {{Cl|LINE INPUT}} {{ | {{Cl|COLOR}} 15: {{Cl|LINE INPUT}} {{Text|;|red}} "", name$ ' get search name from user | ||
{{Cl|LOCATE}} 29, 2: {{Cl|PRINT}} {{Cl|SPC}}(78); ' erase previous prompt | {{Cl|LOCATE}} 29, 2: {{Cl|PRINT}} {{Cl|SPC}}(78); ' erase previous prompt | ||
n$ = {{Cl|UCASE$}}(name$) ' convert search name to upper case | n$ = {{Cl|UCASE$}}(name$) ' convert search name to upper case | ||
| Line 37: | Line 37: | ||
{{Cl|SLEEP}} | {{Cl|SLEEP}} | ||
{{CodeEnd}} | {{CodeEnd}} | ||
{{OutputStart}}{{ | {{OutputStart}} | ||
{{Text|Enter a name to search for...|#FFFF00}} █ | |||
{{OutputEnd}} | {{OutputEnd}} | ||
: ''Explanation:'' The {{ | : ''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. | ||
{{PageSeeAlso}} | |||
* [[INPUT (file mode)]], [[INPUT (file statement)|INPUT #]], [[LINE INPUT (file statement)|LINE INPUT #]] | * [[INPUT (file mode)]], [[INPUT (file statement)|INPUT #]], [[LINE INPUT (file statement)|LINE INPUT #]] | ||
* [[INPUT]], [[INPUT$]] {{ | * [[INPUT]], [[INPUT$]] {{Text|(keyboard input)}} | ||
* [[COLOR]], [[LOCATE]] | * [[COLOR]], [[LOCATE]] | ||
* [[INKEY$]] | * [[INKEY$]] | ||
Latest revision as of 20:25, 26 January 2024
The LINE INPUT statement requests a STRING keyboard entry from a program user.
Syntax
- LINE INPUT [;] "[text prompt or question]"{,|;} stringVariable$
- LINE INPUT ; stringVariable$
Parameters
- A semicolon immediately after LINE INPUT stops the cursor after the entry and prevents screen roll on the lowest two screen rows.
- text prompt or question is optional, but quotes are necessary unless just a semicolon is used before the stringVariable$.
- Requires only one string variable to hold the entire text entry.
Description
- Cannot use numerical type variables or comma separated variable lists for multiple entries.
- Allows commas and quotation marks in the user input, unlike INPUT where commas denote extra input values and quotes delimit strings.
- The statement halts the program until an entry is made. Pressing Enter ends the entry and code execution resumes.
- LINE INPUT does not trim off leading or trailing spaces in the string entry like INPUT string returns.
- Use VAL to convert string numbers and &O (octal), &H (hexadecimal) or &B (binary) prefixed entries into numerical values.
- Use _DEST _CONSOLE before LINE INPUT statements to receive input from a console window.
- Note: QB64 will not remove CHR$(0) from the end of LINE INPUT string return values like QBasic did.
Examples
Example: Preventing screen roll after an input entry on the bottom 2 screen rows.
SCREEN 12 COLOR 14: LOCATE 29, 2 ' place dursor at beginning of prompt liine PRINT "Enter a name to search for... "; 'print prompt on screen COLOR 15: LINE INPUT ; "", name$ ' get search name from user LOCATE 29, 2: PRINT SPC(78); ' erase previous prompt n$ = UCASE$(name$) ' convert search name to upper case COLOR 14' change foreground color to yellow LOCATE 29, 2: PRINT "Searching..."; 'print message SLEEP |
Enter a name to search for... █
|
- Explanation: The red semicolon after LINE INPUT acts like a semicolon after a PRINT, which keeps the print cursor on the same row.
See also
- INPUT (file mode), INPUT #, LINE INPUT #
- INPUT, INPUT$ (keyboard input)
- COLOR, LOCATE
- INKEY$
- _KEYHIT, _KEYDOWN