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51 lines
1.2 KiB
Markdown
51 lines
1.2 KiB
Markdown
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See [OPEN](OPEN).
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The [OUTPUT](OUTPUT) file mode is used in an [OPEN](OPEN) statement to send new data to files or ports.
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## Syntax
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> [OPEN](OPEN) fileName$ **FOR** [OUTPUT](OUTPUT) **AS** #1
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## Description
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* OUTPUT mode erases all previous data in an existing file or clears a port receive buffer.
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* Creates an empty file if the filename does not exist. Use [APPEND](APPEND) if previous file data is to be preserved.
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* Mode can use [PRINT (file statement)](PRINT-(file-statement)), [WRITE (file statement)](WRITE-(file-statement)) or [PRINT USING (file statement)](PRINT-USING-(file-statement)) to output file data.
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## Example(s)
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Writes new data to a text file sequentially and reads it back to the program screen.
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```vb
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filename$ = "testfile.dat"
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x = 1: y = 2: z$ = "Three"
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OPEN filename$ FOR OUTPUT AS #1 'opens and clears an existing file or creates new empty file
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WRITE #1, x, y, z$
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CLOSE #1
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PRINT "File created with data. Press a key!"
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K$ = INPUT$(1) 'press a key
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OPEN filename$ FOR INPUT AS #2 'opens a file to read it
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INPUT #2, a, b, c$
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CLOSE #2
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PRINT a, b, c$
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END
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```
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## See Also
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* [APPEND](APPEND), [RANDOM](RANDOM)
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* [INPUT (file mode)](INPUT-(file-mode)), [BINARY](BINARY)
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* [WRITE](WRITE), [INPUT (file statement)](INPUT-(file-statement))
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