1// run
2
3// Copyright 2009 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Test floating-point literal syntax.
8
9package main
10
11var bad bool
12
13func 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
23func 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
49func 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