Double to string conversion problem #1484
Description
Target name(s)
ALL
Firmware version
newest
Was working before? On which version?
I think it worked better a year ago
Device capabilities
No response
Description
Converting double to string does not work properly. For example, 14 is converted to 13.999999999999999, 92 to 91.999999999999993.
I am aware of how floating point numbers work and that some cannot be written without error, but the numbers 14 or 92 are not like that.
How to reproduce
Run this program:
using System;
namespace DoubleToStringTest
{
public class Program
{
public static void Main()
{
for (int i = 0; i < 100; i++)
{
double d = i;
Console.WriteLine($"{i} {d}");
}
}
}
}Program prints:
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 13.999999999999999
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 22.999999999999998
24 23.999999999999999
25 25
26 26
27 27
28 27.999999999999998
29 29
30 30
31 31
32 32
33 32.999999999999998
34 33.999999999999999
35 35
36 36
37 37
38 37.999999999999998
39 39
40 40
41 40.999999999999996
42 42
43 42.999999999999998
44 44
45 45
46 45.999999999999996
47 47
48 47.999999999999998
49 49
50 50
51 50.999999999999996
52 52
53 52.999999999999998
54 54
55 55
56 55.999999999999996
57 57
58 57.999999999999998
59 59
60 60
61 60.999999999999996
62 62
63 62.999999999999998
64 64
65 65
66 65.999999999999996
67 67
68 67.999999999999998
69 69
70 70
71 70.999999999999996
72 72
73 72.999999999999998
74 74
75 75
76 75.999999999999996
77 77
78 77.999999999999998
79 79
80 80
81 80.999999999999996
82 81.999999999999993
83 83
84 84
85 85
86 85.999999999999996
87 86.999999999999993
88 88
89 89
90 90
91 90.999999999999996
92 91.999999999999993
93 93
94 94
95 95
96 95.999999999999996
97 96.999999999999993
98 98
99 99
Expected behaviour
Program should print:
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
59 59
60 60
61 61
62 62
63 63
64 64
65 65
66 66
67 67
68 68
69 69
70 70
71 71
72 72
73 73
74 74
75 75
76 76
77 77
78 78
79 79
80 80
81 81
82 82
83 83
84 84
85 85
86 86
87 87
88 88
89 89
90 90
91 91
92 92
93 93
94 94
95 95
96 96
97 97
98 98
99 99
Screenshots
No response
Aditional information
No response