java中大数的一些基本运算

import java.math.BigInteger;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner in = new Scanner(System.in);

		BigInteger a,b;

		while(in.hasNext())

		{

			a = in.nextBigInteger();

			b = in.nextBigInteger();

			//四则运算

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

			System.out.println(a.subtract(b));

			System.out.println(a.multiply(b));

			System.out.println(a.divide(b));

			System.out.println(a.remainder(b));

			//大数比较

			if(a.compareTo(b)==0)

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

			else if(a.compareTo(b)>0)

				System.out.println("a>b");

			else {

				System.out.println("a<b");

			}

			//绝对值

			System.out.println(a.abs());

			//幂

			int fun = 10;

			System.out.println(a.pow(fun));

			//大数x进制的字符串表示

			int x = 8;

			System.out.println(a.toString(x));

			//大数返回十进制的字符串表示

			System.out.println(a.toString());

		}

	}

}

toPlainString() //转为普遍计数法输出

//给一个字符串1.238761976E-10

//如何得到0.0000000001238761976这个字符串呢？

BigDecimal bd = new BigDecimal("1.238761976E-10");

System.out.println(bd.toPlainString());

stripTrailingZeros() //去掉末尾0

//给一个字符串1245600.000

//如何得到1245600这个字符串？

BigDecimal bd=new BigDecimal("1245600.000");

System.out.println(bd.stripTrailingZeros());

hdu1063

import java.math.BigDecimal;

import java.math.BigInteger;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);

        while(in.hasNext())

        {

            BigDecimal ans = BigDecimal.valueOf(1);

            BigDecimal a = in.nextBigDecimal();

            Integer n = in.nextInt();

            while(n-->0)

                ans = ans.multiply(a);

                String str = ans.stripTrailingZeros().toPlainString().toString();

                if(str.charAt(0)=='0')

                    str = str.substring(1);

                System.out.println(str);

        }

        in.close();

    }

}

hdu 1753

import java.math.BigDecimal;

import java.util.Scanner;

public class test1 {

	public static void main(String[] args) {

		Scanner in = new Scanner(System.in);

		while(in.hasNext())

		{

			BigDecimal a = in.nextBigDecimal();

			BigDecimal b = in.nextBigDecimal();

				a=a.add(b);

				String str = a.stripTrailingZeros().toPlainString().toString();

				if(str.charAt(0)=='0')

					str = str.substring(1);

				System.out.println(str);

		}

		in.close();

	}

}

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java中大数的一些基本运算

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