diff options
Diffstat (limited to 'src')
| -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 | |||
