Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

398 Chapter 10 Thinking in Objects
There is no limit to the precision of a BigDecimal object. The divide method may throw
an ArithmeticException if the result cannot be terminated. However, you can use
the overloaded divide(BigDecimal d, int scale, int roundingMode) method to
specify a scale and a rounding mode to avoid this exception, where scale is the maximum
number of digits after the decimal point. For example, the following code creates two
BigDecimal objects and performs division with scale 20 and rounding mode
BigDecimal.ROUND_UP.
BigDecimal a = new BigDecimal(1.0);
BigDecimal b = new BigDecimal(3);
BigDecimal c = a.divide(b, 20, BigDecimal.ROUND_UP);
System.out.println(c);
The output is 0.33333333333333333334.
Note that the factorial of an integer can be very large. Listing 10.11 gives a method that can
return the factorial of any integer.
constant
multiply
LISTING 10.11
LargeFactorial.java
1 import java.math.*;
2
3 public class LargeFactorial {
4 public static void main(String[] args) {
5 System.out.println("50! is \n" + factorial(50));
6 }
7
8 public static BigInteger factorial(long n) {
9 BigInteger result = BigInteger.ONE;
10 for (int i = 1; i