Input / Output
Input / Output or I/O is the way in which the computer communicates with the outside world.
These functions write the external representation of obj to the output port. write writes a form that can be read back in by Scheme; for example, a string will be enclosed in "". display writes the external form without any extra characters.
> (begin (write "Foo") (newline)) "Foo" #f
> (begin (display "Foo") (newline)) Foo #f
(newline) writes a newline character.
(write-char char) writes the single character char.
Each of these functions can optionally have a port as an additional argument.
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