Printing Ratios (ANSI and GNU Common Lisp Document)

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#### 22.1.3.3 Printing Ratios

Ratios are printed as follows: the absolute value of the numerator is printed, as for an integer; then a `/`; then the denominator. The numerator and denominator are both printed in the radix specified by the current output base; they are obtained as if by numerator and denominator, and so ratios are printed in reduced form (lowest terms). If appropriate, a radix specifier can be printed; see *print-radix*. If the ratio is negative, a minus sign is printed before the numerator.

For related information about the syntax of a ratio, see Syntax of a Ratio.