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Scheme's writer procedures take the object that is to be
written and an optional output port argument. If the port
is not specified, the current output port (usually the
console) is assumed.
Writing can be character- or s-expression-based.
The procedure write-char writes the given character
(without the #\) to the port.
The procedures write and display both
write the given s-expression to the port, with one
difference: write attempts to use a machine-readable
format and display doesn't. Eg, write uses double
quotes for strings and the #\ syntax for characters.
display doesn't.
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