java大整数BigInteger

import java.util.*;
import java.math.*;
public class Main{
    public static void main(String args[]){
       Scanner cin = new Scanner(System.in);
       BigInteger a, b;
        
       //以文件EOF结束
       while (cin.hasNext()){
           a = cin.nextBigInteger();
           b = cin.nextBigInteger();

        System.out.println(a.add(b)); //大整数加法

System.out.println(a.subtract(b)); //大整数减法 System.out.println(a.multiply(b)); //大整数乘法 System.out.println(a.divide(b)); //大整数除法(取整) System.out.println(a.remainder(b)); //大整数取模 //大整数的比较 if( a.compareTo(b) == 0 ) System.out.println("a == b"); //大整数a==b else if( a.compareTo(b) > 0 ) System.out.println("a > b"); //大整数a>b else if( a.compareTo(b) < 0 ) System.out.println("a < b"); //大整数a<b //大整数绝对值 System.out.println(a.abs()); //大整数a的绝对值 //大整数的幂 int exponent=10; System.out.println(a.pow(exponent)); //大整数a的exponent次幂 //返回大整数十进制的字符串表示 System.out.println(a.toString()); //返回大整数p进制的字符串表示 int p=8; System.out.println(a.toString(p)); } }}

例子uva 1646

import java.math.*;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) throws Exception {
		 BigInteger []s=new  BigInteger[10005];
		Scanner cin=new Scanner(System.in);
		s[3]= BigInteger.valueOf(4);
		s[4]= BigInteger.valueOf(7);
		for(int i=5;i<=10000;i++)
		{
			s[i]= s[i-1].add(s[i-2]);
		}
		while(cin.hasNext())
		{
		  int n=cin.nextInt();
		  System.out.println(s[n]);
	   }
	   cin.close();
	}


}