lispdoc - results for round

(round number &optional (divisor 1))

Function: Rounds number (or number/divisor) to nearest integer. The second returned value is the remainder.

Example:

(defun time-string (time)
  "Return a string representing this internal time in min:secs."
  (multiple-value-bind (min sec)
      (floor
       (round time
              internal-time-units-per-second)
       60)
    (format nil "~2d:~2,'0d" min sec)))

Mentioned in:
CLtL2 - 12.4. Arithmetic Operations
CLtL2 - 12.6. Type Conversions and Component Extractions on Numbers
CLtL2 - 4.8. Type Conversion Function
HyperSpec - Function FLOOR, FFLOOR, CEILING, FCEILING, TRUNCATE, FTRUNCATE, ROUND, FROUND
PCL - basic math
Successful Lisp - chapter20