double SDL_acos(double x)
| x | 浮動小数点のラジアンの値 |
/* acos(x) = Pi/2 - asin(x) */
SDL_Log("acos(0):¥t¥t%f", SDL_acos(0));
SDL_Log("Pi/2 - asin(0):¥t%f", M_PI / 2 - SDL_asin(0));
/* acos(-x) = Pi - acos(x) */
SDL_Log("acos(-(-1)):¥t%f", SDL_acos(-(-1)));
SDL_Log("Pi - acos(-1):¥t%f", M_PI - SDL_acos(-1));