Fundamentals of CS I (CS151 2001S) : Reference
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Procedure  abs 

Parameters  n, a number 
Purpose  Computes the absolute value of n. 
Produces  A number. If n is not negative, produces n. If n is negative, produces the opposite of n. 
Preconditions  Only one parameter (verified). n is a number (verified). 
Postconditions  The result is the same kind of number (integer, exact, inexact, etc.) as the parameter. The result is not negative. 
Examples  > (abs 0)
> (abs 1.5)
1.5

"..." (double quote)

+ (plus)

#\character (pound backslash)

#\newline

#\space

; (semicolon)
* (times)

abs

and

append

boolean?

car

cdr

char?

char<?

char<=?

char=?

char>=?

char>?

charalphabetic?

charci<?

charci<=?

charci=?

charci>?

charci>=?

char>integer

chardowncase

charlowercase?

charnumeric?

charuppercase?

charupcase

charwhitespace?

complex?

cons

eq?

equal?

eqv?

exact?

exact>inexact

exp

expt

inexact?

integer?

integer>char
length

list

list?

listref

null

null?

number?

procedure?
rational?

real?

reverse
sqrt

string?

symbol?
[Current]
[Discussions]
[Glance]
[Honesty]
[Instructions]
[Links]
[News]
[Search]
[Syllabus]
Primary
[Examples]
[Exams]
[Handouts]
[Homework]
[Labs]
[Outlines]
[Quizzes]
[Readings]
[Reference]
Sets
[Blackboard]
[Scheme Report]
[SamR's Schedule]
[Rebelsky/Fall 2000]
[Walker/Fall2000]
[Stone/Spring2000]
Links
Disclaimer: I usually create these pages on the fly. This means that they are rarely proofread and may contain bad grammar and incorrect details. It also means that I may 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 was last modified Fri Jan 26 00:00:33 2001.