public void testToStrb() {
BigNum a = new BigNum(STR);
String str = null;
long st = System.currentTimeMillis();
for (int i = 0; i < MAX_CNT; i++) {
str = a.toString();
}
long ed = System.currentTimeMillis() - st;
System.out.println(str + ":" + ed + "ms");
a = null;
}
public void testDivb() {
BigNum a = new BigNum(STR);
BigNum b = new BigNum(STR2);
long st = System.currentTimeMillis();
for (int i = 0; i < MAX_CNT2; i++) {
b = b.divide(a, 20, BigNumRound.HALF_EVENT);
}
long ed = System.currentTimeMillis() - st;
System.out.println(b + ":" + ed + "ms");
a = null;
b = null;
}
public void testMulb() {
BigNum a = new BigNum(STR);
BigNum b = new BigNum(STR);
long st = System.currentTimeMillis();
for (int i = 0; i < MAX_CNT2; i++) {
b = b.multiply(a);
}
long ed = System.currentTimeMillis() - st;
System.out.println(b + ":" + ed + "ms");
a = null;
b = null;
}
public void testSubtractb1() {
BigNum a = new BigNum(STR);
BigNum b = new BigNum("0.0");
long st = System.currentTimeMillis();
for (int i = 0; i < MAX_CNT; i++) {
b = b.subtract(a);
}
long ed = System.currentTimeMillis() - st;
System.out.println(b + ":" + ed + "ms");
a = null;
b = null;
}
public static void test3() {
BigNum angle = new BigNum("0.0");
BigNum maxVal = new BigNum("0.25").multiply(BigNum.PI);
BigNum step = BigNum.PI.divide(new BigNum("12.0"), 40, BigNumRound.HALF_EVENT);
System.out.print("\t\tInit=" + angle + "\t,MaxValue=" + maxVal + "\t,step=" + step);
for (; angle.compareTo(maxVal) <= 0; ) {
System.out.println(
"\t\tsin("
+ MathBn.toDegrees(angle)
+ ")="
+ MathBn.sin(angle)); // taylorSeriesSine(angle));
angle = angle.add(step);
}
}
/**
* sin(x) = x - x^3/3! + x^5/5! - x^7/7! +...
*
* @param radians
* @return
*/
public static BigNum taylorSeriesSine(BigNum radians) {
BigNum res = new BigNum("0.0");
BigNum a = new BigNum("-1.0");
BigNum sign = new BigNum("1.0");
for (int i = 1; i < 40; i += 2) {
BigNum augend = radians.pow(i).multiply(sign);
BigNum fac = new BigNum(i).factorial();
BigNum b = augend.divide(fac, 40, BigNumRound.HALF_EVENT);
res = res.add(b);
sign = sign.multiply(a);
}
return res;
}