PRINT (file statement)
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The PRINT # statement prints numeric or string expressions to a sequential file, IO port or device.
Syntax
- PRINT #fileNumber&, [ [expression] [{;|,] ... ]
- fileNumber& is the file number of a file or device opened for writing. See Template:KW.
- expression is a numeric or string expression to be written to the file. Quotes will be removed from strings.
- The print statement can be followed by a semicolon to stop the print cursor or a comma to tab the next print.
Usage:
- STRING values will be stripped of leading and trailing quotation marks when printed to the file. Use CHR$(34) to add quotes to a file.
- separator is used to separate multiple expressions and specifies how the file cursor is to be moved before writing the next expression. It can be one of the following:
- semi-colon (;) - specifies that the print cursor stop immediately after the print. A subsequent print will start there.
- comma (,) - specifies that the file cursor is to move to the next 14-column tab-stop. If the file cursor is at column 56 or greater, it is moved to the next file row at column 1.
- If separator is not used at the end of the expression list, the file cursor moves to the next file row at column 1.
- PRINT # can use the + concatenation operator or semicolons to combine strings.
- SPC(n%) - specifies that n% space characters will be written in a print.
- TAB(column%) - specifies that the file cursor is to move to a column number column%. If the file cursor is beyond that column, it is moved to that column on the next file row.
- When printing literal or variable numerical values the following rules apply:
- If the value is positive, the number is prefixed with a space character, otherwise, the number is prefixed with a negative sign (-).
- If the value is an INTEGER (whole number), no decimal point or fractional part will be written.
- If the value is not an integer (whole number) and has zero for a coefficient, no leading zero is written. For example, -0.123 is written as "-.123 "
- If a numeric literal is in scientific notation, the number is also written in scientific notation. PRINT #, USING can return actual rounded numerical values in string form.
- The numerical value is always followed by a space character unless STR$ is used to convert it to a string value.
- Whenever PRINT # moves the file cursor to a new file row, a carriage return character (Template:KW) followed by a line feed character (Template:KW) is written. The combination are referred to as the "CRLF" character.
- Note: RANDOM and BINARY files are not affected by PRINT # statements to them and will create a syntax error in QB64!
Example: Prints data to a text file sequentially and reads it back to the program screen as one line of text.
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 PRINT #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 LINE INPUT #2, text$ CLOSE #2 PRINT text$ WRITE text$ END |
- File content: PRINT string file values will not include the enclosing quotation marks but can be read by LINE INPUT as text.
1 2 Three |
- Screen output: PRINT string values will not display enclosing quotation marks. WRITE screen displays will.
1 2 Three " 1 2 Three" |
See also