WRITE (file statement)

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The WRITE # file statement writes a list of comma separated variable values to a sequential file or port.


WRITE #filenumber&[, expressionList]


  • filenumber& is the number of the file or device OPENed in the OUTPUT or APPEND modes. See: FREEFILE.
  • 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.


Screen output: PRINT string values will not display enclosing quotes. WRITE screen displays will.

1 2 Three 1,2,"Three"

See also

Keyword Reference - Alphabetical
Keyword Reference - By usage
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