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Contents
require 'facets/core/float/round_off'
class Float
# Rounds to the nearest _n_th degree.
#
# 4.555.round_to(1) #=> 5.0
# 4.555.round_to(0.1) #=> 4.6
# 4.555.round_to(0.01) #=> 4.56
# 4.555.round_to(0) #=> 4.555
#
def round_to( n ) #n=1
return self if n == 0
(self * (1.0 / n)).round_off.to_f / (1.0 / n)
end
end
class Numeric
# To properly support Float's rounding methods,
# Numeric must also be augmented.
def round_to(*args)
self.to_f.round_to(*args)
end
end
class Integer
# To properly support Float's rounding methods,
# Integer must also be augmented.
def round_to(*args)
self.to_f.round_to(*args)
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCFloat < Test::Unit::TestCase
def setup
@f0 = [ 0, 10, 15, 105 ]
@f1 = [ 10.1, 10.01, 10.9, 10.09, 10.5, 10.05, 10.49 ]
end
def test_round_to_arg1
fr = @f0.collect { |f| f.round_to(0.1) }
assert_equal( [0,10,15,105], fr )
fr = @f1.collect { |f| f.round_to(0.1) }
assert_equal( [10.1,10.0,10.9,10.1,10.5,10.1,10.5], fr )
end
def test_round_to_arg10
fr = @f0.collect { |f| f.round_to(10) }
assert_equal( [0,10,20,110], fr )
fr = @f1.collect { |f| f.round_to(10) }
assert_equal( [10,10,10,10,10,10,10], fr )
end
def test_round_off
assert_equal( 1.0, 1.2.round_off )
assert_equal( 2.0, 1.8.round_off )
end
end
=end
Version data entries
21 entries across 21 versions & 1 rubygems