Fundamentals of Computer Science 1 (CS151 2003S)
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Back to Input and Output. On to Variable-Arity Procedures.
Held: Tuesday, 8 April 2003
Summary: Today we consider how to make Scheme read values and characters from files and write values to other files.
Related Pages:
Due
Assignments
Notes:
Overview:
anythingyou can do on the computer.
(open-input-file file-name)
.
(open-output-file file-name)
.
(read port)
(newline port)
(write value port)
(display value port)
(close-input-port port)
(close-output-port port)
(let* (; Prepare to read from a file (source (open-input-file "data")) ; Read one value (value (read source))) ; We're done, so clean up. (close-input-port source) ; Return the value read value)
read
do when there's nothing left in the file?
It returns a special value (which DrScheme displays as
#<eof>
).
eof-object?
(read-char port)
.
read
procedure.
(peek-char port)
read-char
encounters the end of the file, it returns
the same special value as read
Thursday, 16 January 2003 [Samuel A. Rebelsky]
Back to Input and Output. On to Variable-Arity Procedures.
[Skip to Body]
Primary:
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[Current]
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[EC]
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[Search]
[Syllabus]
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[EBoards]
[Examples]
[Exams]
[Handouts]
[Homework]
[Labs]
[Lab Writeups]
[Outlines]
[Project]
[Readings]
[Reference]
ECA:
[About]
[Grades]
[Quizzes]
[Submit Work]
[Change Password]
[Reset Password]
Misc:
[Scheme Reference]
[Scheme Report]
[CS151 2003S Gum]
[CS151 2002F]
[CS151 History]
[SamR]
Disclaimer:
I usually create these pages on the fly
, which means that I rarely
proofread them and they may contain bad grammar and incorrect details.
It also means that I tend to update them regularly (see the history for
more details). Feel free to contact me with any suggestions for changes.
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The source to the document was last modified on Thu Jan 16 13:46:00 2003.
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