how to print a newline in a file in plt scheme?
Question
I need to have a newline every time I write to a file in plt scheme. I wonder if there is a special procedure that allows me to do this.
Solution
newline can take an optional argument of a port, on which it will emit a newline.
(define myport (open-output-file "greeting.txt"))
(display "hello world" myport)
(newline myport)
OTHER TIPS
If you're displaying a string as in Jay's example, you don't need to use newline
-- MzScheme's strings include the usual C escapes, so you could just do
(with-output-to-file "foo.txt"
(lambda ()
(display "hello world\n")))
Note also that the with-...
forms are generally better than in Jay's code, since that will require you to close the file explicitly -- MzScheme will not close a file that corresponds to a port that has been garbage-collected.
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