%

        # Numeric.%

(from ruby core)
---
    self % other -> real_numeric

---

Returns `self` modulo `other` as a real number.

Of the Core and Standard Library classes, only Rational uses this
implementation.

For Rational `r` and real number `n`, these expressions are equivalent:

    c % n
    c-n*(c/n).floor
    c.divmod(n)[1]

See Numeric#divmod.

Examples:

    r = Rational(1, 2)    # => (1/2)
    r2 = Rational(2, 3)   # => (2/3)
    r % r2                # => (1/2)
    r % 2                 # => (1/2)
    r % 2.0               # => 0.5

    r = Rational(301,100) # => (301/100)
    r2 = Rational(7,5)    # => (7/5)
    r % r2                # => (21/100)
    r % -r2               # => (-119/100)
    (-r) % r2             # => (119/100)
    (-r) %-r2             # => (-21/100)

Numeric#modulo is an alias for Numeric#%.