INPUT$: Difference between revisions

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{{PageDescription}}
* Keyboard input is limited to the [[INTEGER]] {{Parameter|numberOfBytes%}} (characters) designated by program.
* Keyboard input is limited to the [[INTEGER]] {{Parameter|numberOfBytes%}} (characters) designated by program.
* The keyboard is the default device when a file or port number is omitted. The {{Parameter|numberOfBytes%}} is number of key presses to read.
* The keyboard is the default device when a file or port number is omitted. The {{Parameter|numberOfBytes%}} is number of key presses to read.
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* Use [[_DEST]] [[_CONSOLE]] before INPUT$ is used  to receive input from a [[$CONSOLE|console]] window.
* Use [[_DEST]] [[_CONSOLE]] before INPUT$ is used  to receive input from a [[$CONSOLE|console]] window.


 
=== QBasic/QuickBASIC ===
==QBasic/QuickBASIC==
* {{Parameter|numberOfBytes%}} could not exceed 32767 in [[BINARY]] files or a QBasic error would occur.
* {{Parameter|numberOfBytes%}} could not exceed 32767 in [[BINARY]] files or a QBasic error would occur.  
* Ctrl + Break would not interrupt the QBasic program until there was a full INPUT$ key entry. In '''QB64''' Ctrl + Break will immediately exit a running program.
* Ctrl + Break would not interrupt the QBasic program until there was a full INPUT$ key entry. In '''QB64''' Ctrl + Break will immediately exit a running program.


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{{PageExamples}}
{{PageExamples}}
''Example 1:'' A keyboard limited length entry can be made with a fixed blinking cursor. Entry must be completed before it can be shown.
''Example 1:'' A keyboard limited length entry can be made with a fixed blinking cursor. Entry must be completed before it can be shown.
{{CodeStart}} '' ''
{{CodeStart}}
{{Cl|LOCATE}} 10, 10, 1        'display fixed cursor at location
{{Cl|LOCATE}} 10, 10, 1        'display fixed cursor at location
year$ = {{Cl|INPUT$}}(4)        'waits until all 4 digits are entered
year$ = {{Cl|INPUT$}}(4)        'waits until all 4 digits are entered
PRINT year$              'display the text entry '' ''
PRINT year$              'display the text entry
{{CodeEnd}}
{{CodeEnd}}




''Example 2:'' Reading bytes from a text file for an 80 wide screen mode.
''Example 2:'' Reading bytes from a text file for an 80 wide screen mode.
{{CodeStart}} '' ''
{{CodeStart}}
{{Cl|LOCATE}} 5, 5, 1                    'locate and display cursor
{{Cl|LOCATE}} 5, 5, 1                    'locate and display cursor
{{Cl|OPEN}} "Diary.txt" FOR {{Cl|INPUT (file mode)|INPUT}} AS #1  'open existing text file
{{Cl|OPEN}} "Diary.txt" FOR {{Cl|INPUT (file mode)|INPUT}} AS #1  'open existing text file
text$ = {{Cl|INPUT$}}(70, 1)
text$ = {{Cl|INPUT$}}(70, 1)
{{Cl|LOCATE}} 5, 6, 0: PRINT text$      'print text and turn cursor off '' ''
{{Cl|LOCATE}} 5, 6, 0: PRINT text$      'print text and turn cursor off
{{CodeEnd}}
{{CodeEnd}}




''Example 3:'' Getting the entire text file data as one string value.
''Example 3:'' Getting the entire text file data as one string value.
{{CodeStart}} '' ''
{{CodeStart}}
{{Cl|OPEN}} "Diary.txt FOR {{Cl|BINARY}} AS #1  'open an existing file up to 32767 bytes
{{Cl|OPEN}} "Diary.txt FOR {{Cl|BINARY}} AS #1  'open an existing file up to 32767 bytes
IF {{Cl|LOF}}(1) <= 32767 THEN Text$ = {{Cl|INPUT$}}(LOF(1), 1)
IF {{Cl|LOF}}(1) <= 32767 THEN Text$ = {{Cl|INPUT$}}(LOF(1), 1)
{{Cl|CLOSE}} #1 '' ''
{{Cl|CLOSE}} #1
{{CodeEnd}}
{{CodeEnd}}
:''Explanation:'' The IF statement gets the entire contents when the file size is less than 32768. The program can then work with the string by using [[MID$]] or [[INSTR]]. Note: A text file string will also have '''CrLf''' line break end characters [[CHR$]](13) + [[CHR$]](10).
:''Explanation:'' The IF statement gets the entire contents when the file size is less than 32768. The program can then work with the string by using [[MID$ (function)|MID$]] or [[INSTR]]. Note: A text file string will also have '''CrLf''' line break end characters [[CHR$]](13) + [[CHR$]](10).




{{PageSeeAlso}}
{{PageSeeAlso}}
* [[INPUT]], [[LINE INPUT]] {{text|(keyboard input)}}
* [[INPUT]], [[LINE INPUT]] {{Text|(keyboard input)}}
* [[INPUT (file mode)]], [[INPUT (file statement)|INPUT #]], [[LINE INPUT (file statement)|LINE INPUT #]] {{text|(file input)}}
* [[INPUT (file mode)]], [[INPUT (file statement)|INPUT #]], [[LINE INPUT (file statement)|LINE INPUT #]] {{Text|(file input)}}
* [[OPEN]], [[LOC]] {{text|(file)}}  
* [[OPEN]], [[LOC]] {{Text|(file)}}
* [[LOCATE]] {{text|(cursor on/off)}}
* [[LOCATE]] {{Text|(cursor on/off)}}




{{PageNavigation}}
{{PageNavigation}}

Latest revision as of 00:36, 26 February 2023

The INPUT$ function is used to receive data from the user's keyboard, an open file or an open port.


Syntax

result$ = INPUT$(numberOfBytes%[, fileOrPortNumber])


Description

  • Keyboard input is limited to the INTEGER numberOfBytes% (characters) designated by program.
  • The keyboard is the default device when a file or port number is omitted. The numberOfBytes% is number of key presses to read.
  • INPUT$ will wait until the number of bytes are read from the keyboard or port. One byte per loop is recommended with ports.
  • RANDOM opened file bytes can be up to the LEN = recordLength statement, or 128 if no statement is used.
  • fileOrPortNumber is the number that was used in the OPEN AS statement.
  • Returns STRING values including spaces or even extended ASCII characters.
  • Backspace key results in the CHR$(8) character being added to an entry.
  • Use LOCATE , , 1 to view the cursor entry. Turn the cursor off using LOCATE , , 0.
  • Use _DEST _CONSOLE before INPUT$ is used to receive input from a console window.

QBasic/QuickBASIC

  • numberOfBytes% could not exceed 32767 in BINARY files or a QBasic error would occur.
  • Ctrl + Break would not interrupt the QBasic program until there was a full INPUT$ key entry. In QB64 Ctrl + Break will immediately exit a running program.


Examples

Example 1: A keyboard limited length entry can be made with a fixed blinking cursor. Entry must be completed before it can be shown. 

LOCATE 10, 10, 1         'display fixed cursor at location
year$ = INPUT$(4)        'waits until all 4 digits are entered
PRINT year$              'display the text entry


Example 2: Reading bytes from a text file for an 80 wide screen mode. 

LOCATE 5, 5, 1                    'locate and display cursor
OPEN "Diary.txt" FOR INPUT AS #1  'open existing text file
text$ = INPUT$(70, 1)
LOCATE 5, 6, 0: PRINT text$       'print text and turn cursor off


Example 3: Getting the entire text file data as one string value. 

OPEN "Diary.txt FOR BINARY AS #1  'open an existing file up to 32767 bytes
IF LOF(1) <= 32767 THEN Text$ = INPUT$(LOF(1), 1)
CLOSE #1
Explanation: The IF statement gets the entire contents when the file size is less than 32768. The program can then work with the string by using MID$ or INSTR. Note: A text file string will also have CrLf line break end characters CHR$(13) + CHR$(10).


See also


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Keyword Reference - By usage
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