Mercurial > sdl-ios-xcode
annotate test/testmmousetablet.c @ 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 | ae653575d4af |
| children | 975fd903466b |
| rev | line source |
|---|---|
|
2734
dd25eabe441c
Many mouse and tablet linux test file added
Szymon Wilczek <kazeuser@gmail.com>
parents:
diff
changeset
|
1 #include <stdio.h> |
|
dd25eabe441c
Many mouse and tablet linux test file added
Szymon Wilczek <kazeuser@gmail.com>
parents:
diff
changeset
|
2 #include "SDL.h" |
|
dd25eabe441c
Many mouse and tablet linux test file added
Szymon Wilczek <kazeuser@gmail.com>
parents:
diff
changeset
|
3 |
| 2736 | 4 SDL_Surface *screen; |
| 5 int quit = 0; | |
|
2734
dd25eabe441c
Many mouse and tablet linux test file added
Szymon Wilczek <kazeuser@gmail.com>
parents:
diff
changeset
|
6 |
| 2736 | 7 int |
| 8 main() | |
|
2734
dd25eabe441c
Many mouse and tablet linux test file added
Szymon Wilczek <kazeuser@gmail.com>
parents:
diff
changeset
|
9 { |
| 2736 | 10 SDL_Event event; |
| 11 int mice; | |
| 12 int i; | |
| 13 printf("Initing...\n"); | |
| 14 if (SDL_Init(0) != 0) { | |
| 15 return 1; | |
| 16 } | |
| 17 if (SDL_InitSubSystem(SDL_INIT_VIDEO) != 0) { | |
| 18 return 1; | |
| 19 } else { | |
| 20 screen = SDL_SetVideoMode(640, 480, 32, SDL_DOUBLEBUF); | |
| 21 } | |
| 22 mice = SDL_GetNumMice(); | |
| 23 printf("%d pointing devices found\n", mice); | |
| 24 for (i = 0; i < mice; ++i) { | |
| 25 printf("device index: %d name:%s\n", i, SDL_GetMouseName(i)); | |
| 26 } | |
| 27 while (quit != 1) { | |
| 28 if (SDL_PollEvent(&event) == 0) { | |
| 29 } else { | |
| 30 switch (event.type) { | |
| 31 case SDL_MOUSEMOTION: | |
| 32 printf | |
| 33 ("Device id: %d x: %d y: %d relx: %d rely: %d pressure: %d\n \ | |
| 34 pressure_max: %d pressure_min: %d current cursor:%d\n", | |
| 35 event.motion.which, event.motion.x, event.motion.y, event.motion.xrel, event.motion.yrel, | |
| 36 event.motion.pressure, event.motion.pressure_max, event.motion.pressure_min, | |
| 37 event.motion.cursor); | |
| 38 break; | |
| 39 case SDL_PROXIMITYIN: | |
| 40 printf("proximity in id: %d x: %d y: %d\n", | |
| 41 (int) event.proximity.which, event.proximity.x, | |
| 42 event.proximity.y); | |
| 43 break; | |
| 44 case SDL_PROXIMITYOUT: | |
| 45 printf("proximity out id: %d x: %d y: %d\n", | |
| 46 (int) event.proximity.which, event.proximity.x, | |
| 47 event.proximity.y); | |
| 48 break; | |
| 49 case SDL_MOUSEBUTTONDOWN: | |
| 50 printf("mouse button down id: %d button:%d\n", | |
| 51 event.button.which, event.button.button); | |
| 52 break; | |
| 53 case SDL_MOUSEBUTTONUP: | |
| 54 printf("mouse button up id: %d button: %d\n", | |
| 55 event.button.which, event.button.button); | |
| 56 break; | |
| 57 case SDL_QUIT: | |
| 58 printf("Quitting\n"); | |
| 59 SDL_QuitSubSystem(SDL_INIT_VIDEO); | |
| 60 SDL_Quit(); | |
| 61 quit = 1; | |
| 62 break; | |
| 63 } | |
| 64 } | |
| 65 } | |
| 66 return 0; | |
|
2734
dd25eabe441c
Many mouse and tablet linux test file added
Szymon Wilczek <kazeuser@gmail.com>
parents:
diff
changeset
|
67 } |