1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
require_relative '../../spec_helper'
require 'bigdecimal'
describe "BigDecimal#floor" do
before :each do
@one = BigDecimal("1")
@three = BigDecimal("3")
@four = BigDecimal("4")
@zero = BigDecimal("0")
@mixed = BigDecimal("1.23456789")
@mixed_big = BigDecimal("1.23456789E100")
@pos_int = BigDecimal("2E5555")
@neg_int = BigDecimal("-2E5555")
@pos_frac = BigDecimal("2E-9999")
@neg_frac = BigDecimal("-2E-9999")
@infinity = BigDecimal("Infinity")
@infinity_neg = BigDecimal("-Infinity")
@nan = BigDecimal("NaN")
@zero_pos = BigDecimal("+0")
@zero_neg = BigDecimal("-0")
end
it "returns the greatest integer smaller or equal to self" do
@pos_int.floor.should == @pos_int
@neg_int.floor.should == @neg_int
@pos_frac.floor.should == @zero
@neg_frac.floor.should == BigDecimal("-1")
@zero.floor.should == 0
@zero_pos.floor.should == @zero_pos
@zero_neg.floor.should == @zero_neg
BigDecimal('2.3').floor.should == 2
BigDecimal('2.5').floor.should == 2
BigDecimal('2.9999').floor.should == 2
BigDecimal('-2.3').floor.should == -3
BigDecimal('-2.5').floor.should == -3
BigDecimal('-2.9999').floor.should == -3
BigDecimal('0.8').floor.should == 0
BigDecimal('-0.8').floor.should == -1
end
it "raise exception, if self is special value" do
lambda { @infinity.floor }.should raise_error(FloatDomainError)
lambda { @infinity_neg.floor }.should raise_error(FloatDomainError)
lambda { @nan.floor }.should raise_error(FloatDomainError)
end
it "returns n digits right of the decimal point if given n > 0" do
@mixed.floor(1).should == BigDecimal("1.2")
@mixed.floor(5).should == BigDecimal("1.23456")
BigDecimal("-0.03").floor(1).should == BigDecimal("-0.1")
BigDecimal("0.03").floor(1).should == BigDecimal("0")
BigDecimal("23.45").floor(0).should == BigDecimal('23')
BigDecimal("23.45").floor(1).should == BigDecimal('23.4')
BigDecimal("23.45").floor(2).should == BigDecimal('23.45')
BigDecimal("-23.45").floor(0).should == BigDecimal('-24')
BigDecimal("-23.45").floor(1).should == BigDecimal('-23.5')
BigDecimal("-23.45").floor(2).should == BigDecimal('-23.45')
BigDecimal("2E-10").floor(0).should == @zero
BigDecimal("2E-10").floor(9).should == @zero
BigDecimal("2E-10").floor(10).should == BigDecimal('2E-10')
BigDecimal("2E-10").floor(11).should == BigDecimal('2E-10')
(1..10).each do |n|
# 0.3, 0.33, 0.333, etc.
(@one.div(@three,20)).floor(n).should == BigDecimal("0.#{'3'*n}")
# 1.3, 1.33, 1.333, etc.
(@four.div(@three,20)).floor(n).should == BigDecimal("1.#{'3'*n}")
(BigDecimal('31').div(@three,20)).floor(n).should == BigDecimal("10.#{'3'*n}")
end
(1..10).each do |n|
# -0.4, -0.34, -0.334, etc.
(-@one.div(@three,20)).floor(n).should == BigDecimal("-0.#{'3'*(n-1)}4")
end
(1..10).each do |n|
(@three.div(@one,20)).floor(n).should == @three
end
(1..10).each do |n|
(-@three.div(@one,20)).floor(n).should == -@three
end
end
it "sets n digits left of the decimal point to 0, if given n < 0" do
BigDecimal("13345.234").floor(-2).should == BigDecimal("13300.0")
@mixed_big.floor(-99).should == BigDecimal("0.12E101")
@mixed_big.floor(-100).should == BigDecimal("0.1E101")
@mixed_big.floor(-95).should == BigDecimal("0.123456E101")
(1..10).each do |n|
BigDecimal('1.8').floor(-n).should == @zero
end
BigDecimal("1E10").floor(-30).should == @zero
BigDecimal("-1E10").floor(-30).should == BigDecimal('-1E30')
end
end
|
