diff options
Diffstat (limited to 'src/tools/float.cpp')
-rw-r--r-- | src/tools/float.cpp | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/src/tools/float.cpp b/src/tools/float.cpp deleted file mode 100644 index 2c241f3..0000000 --- a/src/tools/float.cpp +++ /dev/null | |||
@@ -1,130 +0,0 @@ | |||
1 | #include <bu/sio.h> | ||
2 | #include <bu/string.h> | ||
3 | #include <stdlib.h> | ||
4 | #include <math.h> | ||
5 | |||
6 | using namespace Bu; | ||
7 | |||
8 | Bu::String ftos( double dNum ) | ||
9 | { | ||
10 | if( dNum == 1.0 ) | ||
11 | return "0x1p+0"; | ||
12 | if( dNum == 0.0 ) | ||
13 | return signbit(dNum)?"-0x0p+0":"0x0p+0"; | ||
14 | if( dNum == -1.0 ) | ||
15 | return "-0x1p+0"; | ||
16 | Bu::String s("0x1."); | ||
17 | if( signbit(dNum) ) | ||
18 | { | ||
19 | s.prepend("-"); | ||
20 | dNum = -dNum; | ||
21 | } | ||
22 | /* | ||
23 | for( int j = 0; j < 150 && dNum; j++ ) | ||
24 | { | ||
25 | dNum = dNum*2; | ||
26 | sio << dNum << " -- " << (int)dNum << sio.nl; | ||
27 | if( (int)dNum == 0 ) | ||
28 | s += '0'; | ||
29 | else | ||
30 | { | ||
31 | s += '1'; | ||
32 | dNum -= 1.0; | ||
33 | } | ||
34 | } | ||
35 | return s; | ||
36 | */ | ||
37 | int iPower = 0; | ||
38 | if( dNum < 1.0 ) | ||
39 | { | ||
40 | while( dNum < 1.0 ) | ||
41 | { | ||
42 | dNum *= 2.0; | ||
43 | iPower--; | ||
44 | } | ||
45 | } | ||
46 | else if( dNum >= 2.0 ) | ||
47 | { | ||
48 | while( dNum >= 2.0 ) | ||
49 | { | ||
50 | dNum *= 0.5; | ||
51 | iPower++; | ||
52 | } | ||
53 | } | ||
54 | dNum -= (int)dNum; | ||
55 | for( int j = 0; j < 150 && dNum; j++ ) | ||
56 | { | ||
57 | dNum = dNum*16.0; | ||
58 | s += "0123456789abcdef"[(int)dNum]; | ||
59 | dNum -= (int)dNum; | ||
60 | } | ||
61 | s.formatAppend("p%+d", iPower ); | ||
62 | return s; | ||
63 | } | ||
64 | |||
65 | double stof( const Bu::String &s ) | ||
66 | { | ||
67 | if( s == "0x1p+0" ) | ||
68 | return 1.0; | ||
69 | if( s == "-0x1p+0" ) | ||
70 | return -1.0; | ||
71 | if( s == "0x0p+0" ) | ||
72 | return 0.0; | ||
73 | if( s == "-0x0p+0" ) | ||
74 | return 0.0; | ||
75 | double dNum = 0.0; | ||
76 | int iPPos = s.getSize()-1; | ||
77 | for(; s[iPPos] != 'p'; iPPos--) { } | ||
78 | for( int i = iPPos-1; s[i] != '.'; i-- ) | ||
79 | { | ||
80 | if( s[i]>='0' && s[i]<='9' ) | ||
81 | { | ||
82 | dNum += s[i]-'0'; | ||
83 | } | ||
84 | else if( s[i]>='a' && s[i]<='f' ) | ||
85 | { | ||
86 | dNum += s[i]-'a'+10.0; | ||
87 | } | ||
88 | dNum *= 0.0625; | ||
89 | } | ||
90 | |||
91 | dNum += 1.0; | ||
92 | |||
93 | int iTop = strtol( s.getStr()+iPPos+1, NULL, 10 ); | ||
94 | if( iTop < 0 ) | ||
95 | { | ||
96 | for( int j = 0; j > iTop; j-- ) | ||
97 | { | ||
98 | dNum *= 0.5; | ||
99 | } | ||
100 | } | ||
101 | else | ||
102 | { | ||
103 | for( int j = 0; j < iTop; j++ ) | ||
104 | { | ||
105 | dNum *= 2.0; | ||
106 | } | ||
107 | } | ||
108 | |||
109 | if( s[0] == '-' ) | ||
110 | return -dNum; | ||
111 | return dNum; | ||
112 | } | ||
113 | |||
114 | int main( int argc, char *argv[] ) | ||
115 | { | ||
116 | for( int j = 1; j < argc; j++ ) | ||
117 | { | ||
118 | double dNum = strtod( argv[j], NULL ); | ||
119 | |||
120 | String s = ftos( dNum ); | ||
121 | sio << "in: " << dNum << sio.nl; | ||
122 | sio << "mine: " << s << sio.nl; | ||
123 | printf("printf: %a\n", dNum ); | ||
124 | sio << "out: " << stof( s ) << sio.nl; | ||
125 | sio << "match: " << (stof( s ) == dNum) << sio.nl << sio.nl; | ||
126 | } | ||
127 | |||
128 | return 0; | ||
129 | } | ||
130 | |||