两个大的整数的运算（java）

 1 import java.math.BigInteger;
 2
 3 public class BigInt {
 4     BigInteger m1;
 5     BigInteger m2;
 6     BigInteger m3;
 7
 8     BigInt(String s1, String s2) {
 9         m1 = new BigInteger(s1);
10         m2 = new BigInteger(s2);
11     }
12
13     public void add() {
14         m3 = m1.add(m2);
15         System.out.println("两个数的和为：" + m3);
16     }
17
18     public void cut() {
19         m3 = m1.subtract(m2);
20         System.out.println("两个数的差为：" + m3);
21     }
22
23     public void multiply() {
24         m3 = m1.multiply(m2);
25         System.out.println("两个数的积为：" + m3);
26     }
27
28     public void divide() {
29         m3 = m1.divide(m2);
30         System.out.println("两个数的商为：" + m3);
31     }
32
33     public void factorCount() {
34         int count = 0;
35         for (BigInteger i = BigInteger.valueOf(2); i.compareTo(m1) < 0; i = i
36                 .add(BigInteger.ONE)) {
37             if (m1.remainder(i).equals(BigInteger.ZERO)) {
38                 ++count;
39             }
40         }
41         System.out.println(m1 + "的因子个数为：" + count);
42     }
43
44
45     public static void main(String[] args)
46     {
47         String num1="123456789123456789123456789";
48         String num2="987654321987654321987654321";
49         BigInt bigInt=new BigInt(num1,num2);
50
51         bigInt.add();
52         bigInt.cut();
53         bigInt.multiply();
54         bigInt.divide();
55         bigInt.factorCount();
56     }
57 }