Fundamentals of Computer Science 1 (CS151 2003S)
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Back to Procedure Definitions. On to Conditionals Lab.
Held: Tuesday, 4 February 2003
Summary: Today we begin to learn how to tell Scheme to make decisions. The procedures used to make decisions are called conditionals. Today's class will be a large group design effort rather than an individual or small group design effort.
Related Pages:
Assignments
Notes:
Overview:
if
if. For example,
if the grade is at least 94, then give the student an A, otherwise, if the grade is between 90 and 93, ...
(if condition success-expression failure-expression)
if
does not behave according to the standard
pattern, in which all the arguments
to a procedure are computed before the procedure is applied).
(if (<= 90 grade) 'A 'F)
(if (<= 90 garde) 'A (if (<= 80 grade 89) 'B (if (<= 70 grade 79) ...)))
(if (<= grade 90) 'A (if (<= 80 grade) 'B (if (<= 70 grade) ...)))
cond
, which more closely resembles a table.
cond
expression looks like
(cond ((condition1) exp1) ((condition2) exp2) ((condition3) exp3) ... (else default-exp))
(cond ((<= 90 grade) 'A) ((<= 80 grade) 'B) ...)
if
nor cond
?
#t
) or false
(#f
).
<
(strictly less than),
<=
(less than or equal to),
=
(equal to),
>=
(greater than or equal to),
and
>
(strictly greater than).
=
,
eq?
,
eqv?
, and
equal?
.
and
,
or
, and not
.
Thursday, 16 January 2003 [Samuel A. Rebelsky]
Tuesday, 4 February 2003 [Samuel A. Rebelsky]
Back to Procedure Definitions. On to Conditionals Lab.
[Skip to Body]
Primary:
[Front Door]
[Current]
[Glance]
-
[EC]
[Honesty]
[Instructions]
[Links]
[Search]
[Syllabus]
Groupings:
[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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