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1. Adrian Cochrane (alcinnz@floss.social)'s status on Friday, 17-Mar-2023 02:36:37 JST Adrian Cochrane

   GNU Multiprecision has a LibMPQ sublibrary implementing fractions, consisting of several mostly-trivial utilities around a struct holding a numerator & denominator as MPN & MPZ numbers. These utilities include:

   * Swapping fields between 2 `mpq_ptr`s.
   * Accessors for the 2 fields.
   * Conversion from/to long pair (signed or not), MPF, double, string, or file. Most complex part.
   * Copy from one MPQ to another.
   * Swap numerator & denominator.

   0/d is normalized to 0/1.

   1/2!

   • Adrian Cochrane (alcinnz@floss.social)'s status on Friday, 17-Mar-2023 02:49:40 JST Adrian Cochrane

     in reply to

     Also I see utilities for:
     * Initialize multiple MPQs, wrapping a utility to initialize one.
     * Negate numerator, cloning where necessary.
     * Test fields for equality.
     * Compare against long pair (signed or not).
     * Clear a variadic-list of MPQs.
     * Clear a MPQ.
     * Normalize, e.g. dividing by GCD.
     * Make numerator positive, cloning where necessary.
     * Add/subtract multiplies by denominator product whilst normalizing so the op can be applied to numerators.
     * Cross-multiply & compare with fastpaths.

     2/3

   • Adrian Cochrane (alcinnz@floss.social)'s status on Friday, 17-Mar-2023 02:55:27 JST Adrian Cochrane

     in reply to

     * Combined/optimized invert & multiply-call with fastpaths, to implement division.
     * Fastpath for multiplying by powers-of-2.
     * Multiplying numerators & denominators whilst dividing by GCD.

     2.1/2.1! Fin for today! Tomorrow: MPZ!