public class Math {
- //public static final double PI=3.14159265358979323846;
-
- public static double fabs(double x) {
- if (x < 0) {
- return -x;
- } else {
- return x;
- }
+ static final double PI=3.14159265358979323846;
+
+ // an alias for setPI()
+ public static double PI() {
+ double PI = 3.14159265358979323846;
+ return PI;
+ }
+
+ public static int abs(int x) {
+ return (x<0)?-x:x;
+ }
+
+ public static long abs(long x) {
+ return (x<0)?-x:x;
+ }
+
+ public static double abs(double x) {
+ return (x<0)?-x:x;
+ }
+
+ public static float abs(float x) {
+ return (x<0)?-x:x;
+ }
+
+ public static double max(double a, double b) {
+ return (a>b)?a:b;
+ }
+
+ public static float max(float a, float b) {
+ return (a>b)?a:b;
+ }
+
+ public static int max(int a, int b) {
+ return (a>b)?a:b;
+ }
+
+ public static long max(long a, long b) {
+ return (a>b)?a:b;
+ }
+
+ public static double min(double a, double b) {
+ return (a<b)?a:b;
+ }
+
+ public static float min(float a, float b) {
+ return (a<b)?a:b;
+ }
+ public static int min(int a, int b) {
+ return (a<b)?a:b;
+ }
+ public static long min(long a, long b) {
+ return (a<b)?a:b;
+ }
+
+ /** sqrt(a^2 + b^2) without under/overflow. **/
+ public static double hypot(double a, double b) {
+ double r;
+ if (abs(a) > abs(b)) {
+ r = b/a;
+ r = abs(a)*sqrt(1+r*r);
+ } else if (b != 0) {
+ r = a/b;
+ r = abs(b)*sqrt(1+r*r);
+ } else {
+ r = 0.0;
}
-
- public static float abs(float a) {
- if (a<0)
- return -a;
- else return a;
+ return r;
+ }
+
+ public static double rint(double x) {
+ double y = ceil(x);
+ double d = y - x;
+ if( d == 0.5 ) {
+ if( ((int)y)%2 == 0 ) {
+ return y;
+ } else {
+ return y - 1.0;
+ }
+ } else if( d < 0.5 ) {
+ return y;
}
+ return y - 1.0;
+ }
+
+ public static native double sin(double a);
+ public static native double cos(double a);
+ public static native double asin(double a);
+ public static native double acos(double a);
+ public static native double tan(double a);
+ public static native double atan(double a);
+ public static native double atan2(double a, double b);
+ public static native double exp(double a);
+ public static native double sqrt(double a);
+ public static native double log(double a);
+ public static native double pow(double a, double b);
+
+ public static native double ceil(double a);
+ public static native double floor(double a);
- public static native double sin(double a);
- public static native double cos(double a);
- public static native double asin(double a);
- public static native double acos(double a);
- public static native double tan(double a);
- public static native double atan(double a);
- public static native double exp(double a);
- public static native double sqrt(double a);
- public static native double log(double a);
- public static native double pow(double a, double b);
-
- public static native float sinf(float a);
- public static native float cosf(float a);
- public static native float expf(float a);
- public static native float sqrtf(float a);
- public static native float logf(float a);
- public static native float powf(float a, float b);
+ public static native float sinf(float a);
+ public static native float cosf(float a);
+ public static native float expf(float a);
+ public static native float sqrtf(float a);
+ public static native float logf(float a);
+ public static native float powf(float a, float b);
+ public static native float ceilf(float a);
+ public static native float IEEEremainder(float f1, float f2);
}