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view src/video/fbcon/SDL_fbkeys.h @ 2752:edd2839b36f7
http://sources.redhat.com/ml/newlib/2002/msg00230.html
Stephen L Moshier wrote:
>
> pow(x,y) returns 0 when x is very close to -1.0 and y is very large.
> The following test program prints
>
> pow(1.0000000000000002e+00 4.5035996273704970e+15) = 2.7182818284590455e+00
> pow(-1.0000000000000002e+00 4.5035996273704970e+15) =0.0000000000000000e+00
> pow(9.9999999999999978e-01 4.5035996273704970e+15) = 3.6787944117144222e-01
> pow(-9.9999999999999978e-01 4.5035996273704970e+15) = 0.0000000000000000e+00
>
> which is incorrect for the negative arguments raised to an odd integer
> power.
>
> -----
> double pow (double, double);
>
> int
> main ()
> {
> double x, y, z;
>
> x = 1.0 + pow (2.0, -52.0);
> y = 1.0 + pow (2.0, 52.0);
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = -x;
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = 1.0 - pow (2.0, -52.0);
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = -x;
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> }
> -----
>
> Here is a patch for newlib/libm/math/epow.c:
Patch checked in and duplicated for ef_pow.c. Thanks.
-- Jeff J.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Mon, 15 Sep 2008 04:31:30 +0000 |
parents | c121d94672cb |
children |
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/* Scancodes for the Linux framebuffer console - Taken with thanks from SVGAlib 1.4.0 */ #define SCANCODE_ESCAPE 1 #define SCANCODE_1 2 #define SCANCODE_2 3 #define SCANCODE_3 4 #define SCANCODE_4 5 #define SCANCODE_5 6 #define SCANCODE_6 7 #define SCANCODE_7 8 #define SCANCODE_8 9 #define SCANCODE_9 10 #define SCANCODE_0 11 #define SCANCODE_MINUS 12 #define SCANCODE_EQUAL 13 #define SCANCODE_BACKSPACE 14 #define SCANCODE_TAB 15 #define SCANCODE_Q 16 #define SCANCODE_W 17 #define SCANCODE_E 18 #define SCANCODE_R 19 #define SCANCODE_T 20 #define SCANCODE_Y 21 #define SCANCODE_U 22 #define SCANCODE_I 23 #define SCANCODE_O 24 #define SCANCODE_P 25 #define SCANCODE_BRACKET_LEFT 26 #define SCANCODE_BRACKET_RIGHT 27 #define SCANCODE_ENTER 28 #define SCANCODE_LEFTCONTROL 29 #define SCANCODE_A 30 #define SCANCODE_S 31 #define SCANCODE_D 32 #define SCANCODE_F 33 #define SCANCODE_G 34 #define SCANCODE_H 35 #define SCANCODE_J 36 #define SCANCODE_K 37 #define SCANCODE_L 38 #define SCANCODE_SEMICOLON 39 #define SCANCODE_APOSTROPHE 40 #define SCANCODE_GRAVE 41 #define SCANCODE_LEFTSHIFT 42 #define SCANCODE_BACKSLASH 43 #define SCANCODE_Z 44 #define SCANCODE_X 45 #define SCANCODE_C 46 #define SCANCODE_V 47 #define SCANCODE_B 48 #define SCANCODE_N 49 #define SCANCODE_M 50 #define SCANCODE_COMMA 51 #define SCANCODE_PERIOD 52 #define SCANCODE_SLASH 53 #define SCANCODE_RIGHTSHIFT 54 #define SCANCODE_KEYPADMULTIPLY 55 #define SCANCODE_LEFTALT 56 #define SCANCODE_SPACE 57 #define SCANCODE_CAPSLOCK 58 #define SCANCODE_F1 59 #define SCANCODE_F2 60 #define SCANCODE_F3 61 #define SCANCODE_F4 62 #define SCANCODE_F5 63 #define SCANCODE_F6 64 #define SCANCODE_F7 65 #define SCANCODE_F8 66 #define SCANCODE_F9 67 #define SCANCODE_F10 68 #define SCANCODE_NUMLOCK 69 #define SCANCODE_SCROLLLOCK 70 #define SCANCODE_KEYPAD7 71 #define SCANCODE_CURSORUPLEFT 71 #define SCANCODE_KEYPAD8 72 #define SCANCODE_CURSORUP 72 #define SCANCODE_KEYPAD9 73 #define SCANCODE_CURSORUPRIGHT 73 #define SCANCODE_KEYPADMINUS 74 #define SCANCODE_KEYPAD4 75 #define SCANCODE_CURSORLEFT 75 #define SCANCODE_KEYPAD5 76 #define SCANCODE_KEYPAD6 77 #define SCANCODE_CURSORRIGHT 77 #define SCANCODE_KEYPADPLUS 78 #define SCANCODE_KEYPAD1 79 #define SCANCODE_CURSORDOWNLEFT 79 #define SCANCODE_KEYPAD2 80 #define SCANCODE_CURSORDOWN 80 #define SCANCODE_KEYPAD3 81 #define SCANCODE_CURSORDOWNRIGHT 81 #define SCANCODE_KEYPAD0 82 #define SCANCODE_KEYPADPERIOD 83 #define SCANCODE_LESS 86 #define SCANCODE_F11 87 #define SCANCODE_F12 88 #define SCANCODE_KEYPADENTER 96 #define SCANCODE_RIGHTCONTROL 97 #define SCANCODE_CONTROL 97 #define SCANCODE_KEYPADDIVIDE 98 #define SCANCODE_PRINTSCREEN 99 #define SCANCODE_RIGHTALT 100 #define SCANCODE_BREAK 101 /* Beware: is 119 */ #define SCANCODE_BREAK_ALTERNATIVE 119 /* on some keyboards! */ #define SCANCODE_HOME 102 #define SCANCODE_CURSORBLOCKUP 103 /* Cursor key block */ #define SCANCODE_PAGEUP 104 #define SCANCODE_CURSORBLOCKLEFT 105 /* Cursor key block */ #define SCANCODE_CURSORBLOCKRIGHT 106 /* Cursor key block */ #define SCANCODE_END 107 #define SCANCODE_CURSORBLOCKDOWN 108 /* Cursor key block */ #define SCANCODE_PAGEDOWN 109 #define SCANCODE_INSERT 110 #define SCANCODE_REMOVE 111 #define SCANCODE_RIGHTWIN 126 #define SCANCODE_LEFTWIN 125 /* vi: set ts=4 sw=4 expandtab: */