为什么结果小数点后间有一大串0

Question

package scanfprintf;

import java.util.Scanner;

public class Scanfprintf {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double a,b,c;
        Scanner readerScanner = new Scanner(System.in);
        System.out.println("从键盘输入一个浮点数");
        a = readerScanner.nextDouble();// readerScanner调用方法读取用户从键盘输入的数据，并赋值给a
        b = a*a;
        c = a*a*a;
        System.out.println("b="+b);//输出b
        System.out.println("c="+c);//输出c

    }

}

Answer 1

精度问题