blob: 8bfc0ed8ed2a7dd97d5bf8d4fc8c1b042ba5bc83 (
plain)
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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
# frozen_string_literal: false
#
#--
# bigdecimal/util extends various native classes to provide the #to_d method,
# and provides BigDecimal#to_d and BigDecimal#to_digits.
#++
require 'bigdecimal'
class Integer < Numeric
# call-seq:
# int.to_d -> bigdecimal
#
# Returns the value of +int+ as a BigDecimal.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# 42.to_d # => 0.42e2
#
# See also Kernel.BigDecimal.
#
def to_d
BigDecimal(self)
end
end
class Float < Numeric
# call-seq:
# float.to_d -> bigdecimal
# float.to_d(precision) -> bigdecimal
#
# Returns the value of +float+ as a BigDecimal.
# The +precision+ parameter is used to determine the number of
# significant digits for the result. When +precision+ is set to +0+,
# the number of digits to represent the float being converted is determined
# automatically.
# The default +precision+ is +0+.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# 0.5.to_d # => 0.5e0
# 1.234.to_d # => 0.1234e1
# 1.234.to_d(2) # => 0.12e1
#
# See also Kernel.BigDecimal.
#
def to_d(precision=0)
BigDecimal(self, precision)
end
end
class String
# call-seq:
# str.to_d -> bigdecimal
#
# Returns the result of interpreting leading characters in +str+
# as a BigDecimal.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# "0.5".to_d # => 0.5e0
# "123.45e1".to_d # => 0.12345e4
# "45.67 degrees".to_d # => 0.4567e2
#
# See also Kernel.BigDecimal.
#
def to_d
BigDecimal.interpret_loosely(self)
end
end
class BigDecimal < Numeric
# call-seq:
# a.to_digits -> string
#
# Converts a BigDecimal to a String of the form "nnnnnn.mmm".
# This method is deprecated; use BigDecimal#to_s("F") instead.
#
# require 'bigdecimal/util'
#
# d = BigDecimal("3.14")
# d.to_digits # => "3.14"
#
def to_digits
if self.nan? || self.infinite? || self.zero?
self.to_s
else
i = self.to_i.to_s
_,f,_,z = self.frac.split
i + "." + ("0"*(-z)) + f
end
end
# call-seq:
# a.to_d -> bigdecimal
#
# Returns self.
#
# require 'bigdecimal/util'
#
# d = BigDecimal("3.14")
# d.to_d # => 0.314e1
#
def to_d
self
end
end
class Rational < Numeric
# call-seq:
# rat.to_d(precision) -> bigdecimal
#
# Returns the value as a BigDecimal.
#
# The required +precision+ parameter is used to determine the number of
# significant digits for the result.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# Rational(22, 7).to_d(3) # => 0.314e1
#
# See also Kernel.BigDecimal.
#
def to_d(precision)
BigDecimal(self, precision)
end
end
class Complex < Numeric
# call-seq:
# cmp.to_d -> bigdecimal
# cmp.to_d(precision) -> bigdecimal
#
# Returns the value as a BigDecimal.
#
# The +precision+ parameter is required for a rational complex number.
# This parameter is used to determine the number of significant digits
# for the result.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# Complex(0.1234567, 0).to_d(4) # => 0.1235e0
# Complex(Rational(22, 7), 0).to_d(3) # => 0.314e1
#
# See also Kernel.BigDecimal.
#
def to_d(*args)
BigDecimal(self) unless self.imag.zero? # to raise eerror
if args.length == 0
case self.real
when Rational
BigDecimal(self.real) # to raise error
end
end
self.real.to_d(*args)
end
end
class NilClass
# call-seq:
# nil.to_d -> bigdecimal
#
# Returns nil represented as a BigDecimal.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# nil.to_d # => 0.0
#
def to_d
BigDecimal(0)
end
end
|
