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ceil 

        # Integer.ceil

(from ruby core)
---
    ceil(ndigits = 0) -> integer

---

Returns the smallest number greater than or equal to `self` with a
precision of `ndigits` decimal digits.

When the precision is negative, the returned value is an integer with at
least `ndigits.abs` trailing zeros:

    555.ceil(-1)  # => 560
    555.ceil(-2)  # => 600
    -555.ceil(-2) # => -500
    555.ceil(-3)  # => 1000

Returns `self` when `ndigits` is zero or positive.

    555.ceil     # => 555
    555.ceil(50) # => 555

Related: Integer#floor.

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