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| ANSI Common Lisp 12 Numbers 12.2 Dictionary of Numbers
12.2.27 / | Function
  Syntax: / number reciprocal / numerator `&rest` denominators+ quotient Arguments and Values: number, denominator - a non-zero number. numerator, quotient, reciprocal - a number. Description: The function / performs division or reciprocation. If no denominators are supplied, the function / returns the reciprocal of number. If at least one denominator is supplied, the function / divides the numerator by all of the denominators and returns the resulting quotient. If each argument is either an integer or a ratio, and the result is not an integer, then it is a ratio. The function / performs necessary type conversions. If any argument is a float then the rules of floating-point contagion apply; see Section 12.1.4 Floating-point Computations. Examples:
       (/ 12 4)  3
       (/ 13 4)  13/4
       (/ -8)  -1/8
       (/ 3 4 5)  3/20
       (/ 0.5)  2.0
       (/ 20 5)  4
       (/ 5 20)  1/4
       (/ 60 -2 3 5.0)  -2.0
       (/ 2 #c(2 2))  #C(1/2 -1/2)
Exceptional Situations: The consequences are unspecified if any argument other than the first is zero. If there is only one argument, the consequences are unspecified if it is zero. Might signal type-error if some argument is not a number. Might signal division-by-zero if division by zero is attempted. Might signal arithmetic-error. See Also: floor, ceiling, truncate, round Allegro CL Implementation Details: None.

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