WRITE (file statement): Difference between revisions
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''Example:'' Writes new data to a text file sequentially and reads it back to the program screen. | ''Example:'' Writes new data to a text file sequentially and reads it back to the program screen. | ||
{{CodeStart}} | {{CodeStart}} | ||
filename$ = "testfile.dat" | filename$ = "testfile.dat" | ||
x = 1: y = 2: z$ = "Three" | x = 1: y = 2: z$ = "Three" | ||
{{Cl|OPEN}} filename$ {{Cl|FOR...NEXT|FOR}} {{Cl|OUTPUT}} {{Cl|AS}} #1 'opens and clears an existing file or creates new empty file | {{Cl|OPEN}} filename$ {{Cl|FOR...NEXT|FOR}} {{Cl|OUTPUT}} {{Cl|AS}} #1 'opens and clears an existing file or creates new empty file | ||
{{Cl|WRITE (file statement)|WRITE}} #1, x, y, z$ | {{Cl|WRITE (file statement)|WRITE}} #1, x, y, z$ | ||
{{Cl|CLOSE}} #1 | {{Cl|CLOSE}} #1 | ||
{{Cl|PRINT}} "File created with data. Press a key!" | {{Cl|PRINT}} "File created with data. Press a key!" | ||
K$ = {{Cl|INPUT$}}(1) 'press a key | K$ = {{Cl|INPUT$}}(1) 'press a key | ||
{{Cl|OPEN}} filename$ {{Cl|FOR (file statement)|FOR}} {{Cl|INPUT (file mode)|INPUT}} {{Cl|AS}} #2 'opens a file to read it | {{Cl|OPEN}} filename$ {{Cl|FOR (file statement)|FOR}} {{Cl|INPUT (file mode)|INPUT}} {{Cl|AS}} #2 'opens a file to read it | ||
{{Cl|INPUT (file statement)|INPUT}} #2, a, b, c$ | {{Cl|INPUT (file statement)|INPUT}} #2, a, b, c$ | ||
{{Cl|CLOSE}} #2 | {{Cl|CLOSE}} #2 | ||
{{Cl|PRINT}} a, b, c$ | {{Cl|PRINT}} a, b, c$ | ||
{{Cl|WRITE}} a, b, c$ | {{Cl|WRITE}} a, b, c$ | ||
{{Cl|END}} | {{Cl|END}} | ||
{{CodeEnd}} | {{CodeEnd}} | ||
: ''File content:'' [[WRITE]] string values will include quotation marks, but they are not required to read the file. | : ''File content:'' [[WRITE]] string values will include quotation marks, but they are not required to read the file. | ||
Revision as of 03:00, 23 January 2023
The WRITE # file statement writes a list of comma separated variable values to a sequential file or port.
Syntax
- Template:KWfilenumber&[, expressionList]
Description
- filenumber& is the number of the file or device Template:KWed in the Template:KW or Template:KW modes. See: Template:KW.
- expressionList is a comma-separated list of values to be written to the file or device.
- WRITE can place any number and types of variable values needed in a file record separated by commas.
- String values will have quotation marks although quotes are not required to read strings in CSV files with INPUT #.
- Data files using WRITE normally will have the same number of values listed on each file line.
- Data containing commas must be in quotation marks. Number commas are illegal!
- WRITE created files are normally read with INPUT #.
- CSV files created can be read by Excel using a .CSV file name extension. Strings may or may not include quotation marks.
- Semicolons cannot be used in or following the WRITE statement!
Example: Writes new data to a text file sequentially and reads it back to the program screen.
filename$ = "testfile.dat" x = 1: y = 2: z$ = "Three" OPEN filename$ FOR OUTPUT AS #1 'opens and clears an existing file or creates new empty file WRITE #1, x, y, z$ CLOSE #1 PRINT "File created with data. Press a key!" K$ = INPUT$(1) 'press a key OPEN filename$ FOR INPUT AS #2 'opens a file to read it INPUT #2, a, b, c$ CLOSE #2 PRINT a, b, c$ WRITE a, b, c$ END |
- File content: WRITE string values will include quotation marks, but they are not required to read the file.
1,2,"Three" |
1 2 Three 1,2,"Three" |
See also
- PRINT #
- INPUT #
- LINE INPUT #
- SQL Client (library)