Source file
test/float_lit.go
1
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7
8
9 package main
10
11 var bad bool
12
13 func pow10(pow int) float64 {
14 if pow < 0 {
15 return 1 / pow10(-pow)
16 }
17 if pow > 0 {
18 return pow10(pow-1) * 10
19 }
20 return 1
21 }
22
23 func close(da float64, ia, ib int64, pow int) bool {
24 db := float64(ia) / float64(ib)
25 db *= pow10(pow)
26
27 if da == 0 || db == 0 {
28 if da == 0 && db == 0 {
29 return true
30 }
31 return false
32 }
33
34 de := (da - db) / da
35 if de < 0 {
36 de = -de
37 }
38
39 if de < 1e-14 {
40 return true
41 }
42 if !bad {
43 println("BUG")
44 bad = true
45 }
46 return false
47 }
48
49 func main() {
50 if !close(0., 0, 1, 0) {
51 print("0. is ", 0., "\n")
52 }
53 if !close(+10., 10, 1, 0) {
54 print("+10. is ", +10., "\n")
55 }
56 if !close(-210., -210, 1, 0) {
57 print("-210. is ", -210., "\n")
58 }
59
60 if !close(.0, 0, 1, 0) {
61 print(".0 is ", .0, "\n")
62 }
63 if !close(+.01, 1, 100, 0) {
64 print("+.01 is ", +.01, "\n")
65 }
66 if !close(-.012, -12, 1000, 0) {
67 print("-.012 is ", -.012, "\n")
68 }
69
70 if !close(0.0, 0, 1, 0) {
71 print("0.0 is ", 0.0, "\n")
72 }
73 if !close(+10.01, 1001, 100, 0) {
74 print("+10.01 is ", +10.01, "\n")
75 }
76 if !close(-210.012, -210012, 1000, 0) {
77 print("-210.012 is ", -210.012, "\n")
78 }
79
80 if !close(0E+1, 0, 1, 0) {
81 print("0E+1 is ", 0E+1, "\n")
82 }
83 if !close(+10e2, 10, 1, 2) {
84 print("+10e2 is ", +10e2, "\n")
85 }
86 if !close(-210e3, -210, 1, 3) {
87 print("-210e3 is ", -210e3, "\n")
88 }
89
90 if !close(0E-1, 0, 1, 0) {
91 print("0E-1 is ", 0E-1, "\n")
92 }
93 if !close(+0e23, 0, 1, 1) {
94 print("+0e23 is ", +0e23, "\n")
95 }
96 if !close(-0e345, 0, 1, 1) {
97 print("-0e345 is ", -0e345, "\n")
98 }
99
100 if !close(0E1, 0, 1, 1) {
101 print("0E1 is ", 0E1, "\n")
102 }
103 if !close(+10e23, 10, 1, 23) {
104 print("+10e23 is ", +10e23, "\n")
105 }
106 if !close(-210e34, -210, 1, 34) {
107 print("-210e34 is ", -210e34, "\n")
108 }
109
110 if !close(0.E1, 0, 1, 1) {
111 print("0.E1 is ", 0.E1, "\n")
112 }
113 if !close(+10.e+2, 10, 1, 2) {
114 print("+10.e+2 is ", +10.e+2, "\n")
115 }
116 if !close(-210.e-3, -210, 1, -3) {
117 print("-210.e-3 is ", -210.e-3, "\n")
118 }
119
120 if !close(.0E1, 0, 1, 1) {
121 print(".0E1 is ", .0E1, "\n")
122 }
123 if !close(+.01e2, 1, 100, 2) {
124 print("+.01e2 is ", +.01e2, "\n")
125 }
126 if !close(-.012e3, -12, 1000, 3) {
127 print("-.012e3 is ", -.012e3, "\n")
128 }
129
130 if !close(0.0E1, 0, 1, 0) {
131 print("0.0E1 is ", 0.0E1, "\n")
132 }
133 if !close(+10.01e2, 1001, 100, 2) {
134 print("+10.01e2 is ", +10.01e2, "\n")
135 }
136 if !close(-210.012e3, -210012, 1000, 3) {
137 print("-210.012e3 is ", -210.012e3, "\n")
138 }
139
140 if !close(0.E+12, 0, 1, 0) {
141 print("0.E+12 is ", 0.E+12, "\n")
142 }
143 if !close(+10.e23, 10, 1, 23) {
144 print("+10.e23 is ", +10.e23, "\n")
145 }
146 if !close(-210.e33, -210, 1, 33) {
147 print("-210.e33 is ", -210.e33, "\n")
148 }
149
150 if !close(.0E-12, 0, 1, 0) {
151 print(".0E-12 is ", .0E-12, "\n")
152 }
153 if !close(+.01e23, 1, 100, 23) {
154 print("+.01e23 is ", +.01e23, "\n")
155 }
156 if !close(-.012e34, -12, 1000, 34) {
157 print("-.012e34 is ", -.012e34, "\n")
158 }
159
160 if !close(0.0E12, 0, 1, 12) {
161 print("0.0E12 is ", 0.0E12, "\n")
162 }
163 if !close(+10.01e23, 1001, 100, 23) {
164 print("+10.01e23 is ", +10.01e23, "\n")
165 }
166 if !close(-210.012e33, -210012, 1000, 33) {
167 print("-210.012e33 is ", -210.012e33, "\n")
168 }
169
170 if !close(0.E123, 0, 1, 123) {
171 print("0.E123 is ", 0.E123, "\n")
172 }
173 if !close(+10.e+23, 10, 1, 23) {
174 print("+10.e+234 is ", +10.e+234, "\n")
175 }
176 if !close(-210.e-35, -210, 1, -35) {
177 print("-210.e-35 is ", -210.e-35, "\n")
178 }
179
180 if !close(.0E123, 0, 1, 123) {
181 print(".0E123 is ", .0E123, "\n")
182 }
183 if !close(+.01e29, 1, 100, 29) {
184 print("+.01e29 is ", +.01e29, "\n")
185 }
186 if !close(-.012e29, -12, 1000, 29) {
187 print("-.012e29 is ", -.012e29, "\n")
188 }
189
190 if !close(0.0E123, 0, 1, 123) {
191 print("0.0E123 is ", 0.0E123, "\n")
192 }
193 if !close(+10.01e31, 1001, 100, 31) {
194 print("+10.01e31 is ", +10.01e31, "\n")
195 }
196 if !close(-210.012e19, -210012, 1000, 19) {
197 print("-210.012e19 is ", -210.012e19, "\n")
198 }
199
200 if bad {
201 panic("float_lit")
202 }
203 }
204
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