fixnump

Arguments: x

Returns t if the argument is a fixnum and returns nil otherwise.

cl-user(2): (fixnump 1)  ;; 1 is a fixnum is any Common Lisp
t
cl-user(3): (fixnump most-positive-fixnum) ;; defined to be a fixnum
t
cl-user(4): (fixnump (1+ most-positive-fixnum))
  ;; defined not to be a fixnum
nil
cl-user(5): (fixnump 1.0) ;; floats are not fixnums
nil
cl-user(6): (fixnump t) ;; works (returning NIL) for 
                        ;; values that are not numbers
nil
cl-user(7): 

See also single-float-p and double-float-p.

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This page was not revised from the 8.1 page.
Created 2010.1.21.