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;
}
/**
* 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;
}