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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
|
/*
* (C) Copyright 1996- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
* In applying this licence, ECMWF does not waive the privileges and immunities
* granted to it by virtue of its status as an intergovernmental organisation nor
* does it submit to any jurisdiction.
*/
#include <cmath>
#include <limits>
#include <utility>
#include "eckit/exception/Exceptions.h"
#include "eckit/log/Log.h"
#include "eckit/types/Fraction.h"
#include "eckit/utils/Translator.h"
#include "eckit/testing/Test.h"
namespace eckit::test {
auto& LOG = Log::info();
//----------------------------------------------------------------------------------------------------------------------
CASE("Constructing fractions") {
// 0
EXPECT(Fraction(0, 1) == Fraction());
EXPECT_THROWS_AS(Fraction(0, 0), std::exception); // this prints a backtrace wi Assertion failed
// negative number
EXPECT(Fraction(-1, 2) == Fraction(3, -6));
// decimals
EXPECT(Fraction(0.16) == Fraction(16, 100));
EXPECT(Fraction(0.1616) == Fraction(1616, 10000));
// 5 / 7
EXPECT(Fraction(0.714285) != Fraction(5, 7));
EXPECT(Fraction(0.7142857142) != Fraction(5, 7));
EXPECT(Fraction(0.71428571428) == Fraction(5, 7));
EXPECT(Fraction(0.714285714285) == Fraction(5, 7));
EXPECT(Fraction(0.714285714286) == Fraction(5, 7));
EXPECT(Fraction(0.714285714285714285) == Fraction(5, 7));
// 1 / 6
EXPECT(Fraction(0.166) != Fraction(1, 6));
EXPECT(Fraction(0.1666) != Fraction(1, 6));
EXPECT(Fraction(0.16666) != Fraction(1, 6));
EXPECT(Fraction(0.166666) != Fraction(1, 6));
EXPECT(Fraction(0.1666666) != Fraction(1, 6));
EXPECT(Fraction(0.16666666) != Fraction(1, 6));
EXPECT(Fraction(0.166666666) != Fraction(1, 6));
EXPECT(Fraction(0.16666666666) == Fraction(1, 6));
EXPECT(Fraction(0.166666666666) == Fraction(1, 6));
EXPECT(Fraction(0.1666666666666) == Fraction(1, 6));
EXPECT(Fraction(0.16666666666666) == Fraction(1, 6));
EXPECT(Fraction(0.166666666666666) == Fraction(1, 6));
EXPECT(Fraction(0.1666666666666666) == Fraction(1, 6));
// 1 / 3
EXPECT(Fraction(0.3333333333) == Fraction(1, 3));
EXPECT(Fraction(0.3333333333333333) == Fraction(1, 3));
// 1 / 1
EXPECT(Fraction(0.9999999999999999) == Fraction(1, 1));
EXPECT(Fraction(0.9999999999999999) == Fraction(10, 10));
// 7 / 10..
EXPECT(Fraction(0.7) == Fraction(7, 10));
EXPECT(Fraction(0.07) == Fraction(7, 100));
EXPECT(Fraction(0.0000007) == Fraction(7, 10000000));
// operations
EXPECT(Fraction(1, 3) + Fraction(2, 3) == Fraction(10, 10));
EXPECT(Fraction(1, 3) - Fraction(2, 6) == Fraction(0, 10));
EXPECT(Fraction(1, 3) * 3 == Fraction(1));
EXPECT(-Fraction(1, 3) == Fraction(1, -3));
EXPECT(2 * Fraction(1, 3) == Fraction(2, 3));
Fraction a(1, 3);
Fraction b(3, 28);
EXPECT(a + b == Fraction(37, 84));
EXPECT(a - b == Fraction(19, 84));
EXPECT(a * b == Fraction(1, 28));
EXPECT(a / b == Fraction(28, 9));
EXPECT(a > b);
EXPECT(a != b);
EXPECT_NOT(a < b);
EXPECT_NOT(a == b);
EXPECT(Fraction("1/3") == Fraction(1, 3));
EXPECT(double(Fraction("1/3")) == 1.0 / 3.0);
EXPECT(Fraction("1") == Fraction(1));
EXPECT(Fraction("1.2") == Fraction(12, 10));
EXPECT(Fraction("1e-6") == Fraction(1, 1000000));
EXPECT(Fraction("1e+6") == Fraction(1000000, 1));
EXPECT(Fraction("1.2e+6") == Fraction(1200000, 1));
EXPECT(Fraction(M_PI) > Fraction(M_E));
EXPECT(Fraction(M_E) > Fraction(M_SQRT2));
LOG << "pi = " << (M_PI - double(Fraction(M_PI))) << std::endl;
LOG << "e = " << (M_E - double(Fraction(M_E))) << std::endl;
LOG << "sqrt2 = " << (M_SQRT2 - double(Fraction(M_SQRT2))) << std::endl;
// EXPECT(Fraction(M_PI), Fraction(1200000, 1));
{
Fraction west(-12);
Fraction east(1.2);
Fraction increment(1.2);
Fraction f(west);
while (f < east) {
f += increment;
}
EXPECT(f == east);
}
{
Fraction west("-77");
Fraction east("7");
Fraction increment("0.7");
Fraction f(west);
while (f < east) {
f += increment;
}
EXPECT(f == east);
}
EXPECT(Fraction(241.85) / Fraction(0.175) == 1382);
EXPECT(Fraction(284.025) / Fraction(0.175) == 1623);
// EXPECT(Fraction(5, 3).intergralPart() == 1);
// EXPECT(Fraction(5, 3).decimalPart() == Fraction(1, 3));
}
//----------------------------------------------------------------------------------------------------------------------
CASE("Overflow during comparisons") {
{
Fraction A(5934563467713522511, 13567822205000000); // 437.39985519021053
Fraction B(8624662771, 19718023); // 437.3999751902105
EXPECT(A < B);
EXPECT(A <= B);
EXPECT(A != B);
EXPECT(B > A);
EXPECT(B >= A);
}
{
constexpr auto MAX = std::numeric_limits<Fraction::value_type>::max();
Fraction A(MAX - 6, MAX - 1);
Fraction B(MAX - 2, MAX - 1);
LOG << MAX - 6 << " ?= " << static_cast<double>(MAX - 6) << std::endl;
LOG << MAX - 2 << " ?= " << static_cast<double>(MAX - 2) << std::endl;
/// @note this demonstrates that numerators/denominators have a lossy representation in double
EXPECT(double(MAX - 6) == double(MAX - 2));
EXPECT(A != B);
/// @note these fail due to the lossy conversion to double of numerators/denominators
// EXPECT(A < B);
// EXPECT(A <= B);
// EXPECT(B > A);
// EXPECT(B >= A);
LOG << "Max denominator" << Fraction::max_denominator() << std::endl;
Fraction U(1, 1);
/// @note these fail due to the lossy conversion to double of numerators/denominators
EXPECT(A != U);
EXPECT(A < U);
EXPECT(A <= U);
EXPECT(U > A);
EXPECT(U >= A);
EXPECT(B != U);
EXPECT(B < U);
EXPECT(B <= U);
EXPECT(U > B);
EXPECT(U >= B);
}
}
//----------------------------------------------------------------------------------------------------------------------
CASE("Regression (Fraction <=> Fraction)") {
Fraction A(-34093871309, 378680550); // -90.033331
Fraction B(-12621809, 378680550); // -0.3333102
EXPECT(A < B);
EXPECT(A <= B);
EXPECT(A != B);
EXPECT(B > A);
EXPECT(B >= A);
}
//----------------------------------------------------------------------------------------------------------------------
CASE("Regression (double <=> Fraction)") {
double A(253.07432399999999006467987783253);
Fraction B(/*253.07435716708162*/ 1591682572, 6289387);
EXPECT(A < B);
EXPECT(A <= B);
EXPECT(A != B);
EXPECT(B > A);
EXPECT(B >= A);
}
//----------------------------------------------------------------------------------------------------------------------
CASE("Regression (Fraction <=> double)") {
Fraction A(/*-253.07435716708162*/ -1591682572, 6289387);
double B(-253.07432399999999006467987783253);
EXPECT(A < B);
EXPECT(A <= B);
EXPECT(A != B);
EXPECT(B > A);
EXPECT(B >= A);
}
//----------------------------------------------------------------------------------------------------------------------
CASE("Values known to have problematic conversion to fraction") {
auto values = std::vector<double>{19.011363983154297, 0.47718059708975263};
for (auto value : values) {
LOG << "Test " << value << "..." << std::endl;
auto frac = Fraction(value);
LOG << "Test " << value << " = " << frac << std::endl;
EXPECT_NOT_EQUAL(frac.denominator(), 0);
}
}
//----------------------------------------------------------------------------------------------------------------------
CASE("Fraction safe conversion") {
constexpr auto safe = static_cast<unsigned long long>(std::numeric_limits<Fraction::value_type>::max());
EXPECT_NO_THROW(Fraction{safe});
constexpr auto unsafe = safe + 1;
EXPECT_THROWS_AS(Fraction{unsafe}, BadCast);
}
//----------------------------------------------------------------------------------------------------------------------
CASE("Fraction inverse") {
for (const auto& test : {
std::make_pair(Fraction{1, 2}, Fraction{2, 1}),
std::make_pair(Fraction{1, 3}, Fraction{3, 1}),
}) {
LOG << "Test (" << test.first << ")**-1 = " << test.second << std::endl;
EXPECT(test.first.inverse() == test.second);
LOG << "Test " << test.first << " = (" << test.second << ")**-1" << std::endl;
EXPECT(test.first == test.second.inverse());
}
Fraction zero(0);
LOG << "Test (" << zero << ")**-1 (throw BadValue)" << std::endl;
EXPECT_THROWS_AS(zero.inverse(), BadValue);
}
//----------------------------------------------------------------------------------------------------------------------
CASE("String to double to fraction to double to string") {
Translator<std::string, double> s2d;
std::string s("-17.9229");
Fraction f(s2d(s));
std::ostringstream oss;
oss << double(f);
EXPECT(oss.str() == s);
}
//----------------------------------------------------------------------------------------------------------------------
} // namespace eckit::test
int main(int argc, char** argv) {
eckit::test::LOG.precision(16);
return eckit::testing::run_tests(argc, argv);
}
|
