fixnum? - test if an object is a fixnum
(import (rnrs)) ;R6RS
(import (rnrs arithmetic fixnums)) ;R6RS
Returns #t if obj is an exact integer object within the fixnum
range, #f otherwise.
The fixnum range is implementation-dependent, see fixnum-width(3scm).
Returns a single boolean object as per the description.
(fixnum? 0) => #t
(fixnum? (expt 2 20)) => #t
(fixnum? #f) => #f
(fixnum? "123") => #f
(fixnum? (fx+ a 1))
=> #t or &implementation-restriction
This procedure can raise exceptions with the following condition types:
- &assertion (R6RS)
- The wrong number of arguments was passed or an argument was outside its
domain.
- R7RS
- The assertions described above are errors. Implementations may signal an
error, extend the procedure's domain of definition to include such
arguments, or fail catastrophically.