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fixed documentation for check-within

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This commit is contained in:
Matthias Felleisen 2012-02-03 10:29:45 -05:00
parent dc7d14580f
commit b63cb42acf
1 changed files with 11 additions and 5 deletions
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16
collects/scribblings/htdp-langs/prim-ops.rkt
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@ -309,12 +309,18 @@
@defform*[#:id [check-within check-within-id]
[(check-within expression expected-expression delta-expression)]]{
[(check-within expression expected-expression delta)]]{
Checks that the first @racket[expression] evaluates to a value within
@racket[delta-expression] of the @racket[expected-expression]. If
@racket[delta-expression] is not a number, @check-within-elem reports an
error.}
Checks whether the value of the @racket[expression] expression is
structurally equal to the value produced by the
@racket[expected-expression] expression; every number in the first
expression must be within @racket[delta] of the corresponding number in
the second expression.
It is an error for @racket[expressions] or @racket[expected-expression]
to produce a function value.
If @racket[delta] is not a number, @check-within-elem reports an error.}
@defform*[#:id [check-error check-error-id]