HDU中大数实现的题目，持续更新（JAVA实现）

HDU1002：大数加法，PE了N次

import java.util.Scanner;

import java.math.*;

public class Main

{

    public static void main(String[] args)

    {

        Scanner cin = new Scanner(System.in);

        int T;

        T=cin.nextInt();

        for(int z=1;z<=T;z++)

        {

            if(z!=1) System.out.println();

            BigInteger a,b;

            a=cin.nextBigInteger();

            b=cin.nextBigInteger();

            System.out.println("Case "+z+":");

            System.out.println(a+" + "+b+" = "+a.add(b));

        }

        cin.close();

    }

}

HDU1042:N!大数乘法

import java.util.Scanner;

import java.math.*;

import javax.naming.ldap.HasControls;

public class Main{

    public static void main(String[] args)

    {

        Scanner cin = new Scanner(System.in);

        int t;

        while(cin.hasNext())

        {

            BigInteger n=BigInteger.valueOf(1);

            t=cin.nextInt();

            for(int i=2;i<=t;i++)

            {

                n=n.multiply(BigInteger.valueOf(i));

            }

            System.out.println(n);

        }

    }

}

HDU1316：How Many Fibs?

import java.math.*;

import java.util.Scanner;

public class Main

{

    public static void main(String[] args)

    {

        Scanner cin = new Scanner(System.in);

        BigInteger []f=new BigInteger[1020];

        f[0]=BigInteger.valueOf(1);

        f[1]=BigInteger.valueOf(1);

        f[2]=BigInteger.valueOf(2);

        for(int i=3;i<1019;i++)

            f[i]=f[i-1].add(f[i-2]);

        BigInteger a,b;

        int sum;

        while(cin.hasNextBigInteger())

        {

            a=cin.nextBigInteger();

            b=cin.nextBigInteger();

            if(a.compareTo(BigInteger.ZERO)==0&&b.compareTo(BigInteger.ZERO)==0) break;

            sum=0;

            for(int i=1;i<=1015;i++)

            {

               if(f[i].compareTo(a)>=0&&f[i].compareTo(b)<=0)

               {

                  sum++;

               }

               if(f[i].compareTo(b)>0) break;

            }

            System.out.println(sum);

        }

        cin.close();

    }

}

HDU1753: 大明 A+B 大数加法加一些函数

import java.math.*;

import java.util.Scanner;

public class Main

{

    public static void main(String[] args)

    {

        Scanner cin = new Scanner(System.in);

        BigDecimal a,b;

        while(cin.hasNextBigDecimal())

        {

            a=cin.nextBigDecimal();

            b=cin.nextBigDecimal();

            System.out.println(a.add(b).stripTrailingZeros().toPlainString());

        }

        cin.close();

    }

}