java - DO-While 循环停止后再进行一次迭代吗？

Question

我正在编写一个巴比伦算法来计算正数的平方根，并且迭代应该继续进行，直到猜测值与上一次猜测值的误差在 1% 以内。我编写的代码将迭代转到错误为 1% 之前的迭代。我怎样才能让它再进行一次迭代？为了弄清楚问题，有没有办法告诉它迭代直到误差<1%？

import java.util.Scanner;

public class sqrt {

    public static void main(String[] args){
        Scanner kb = new Scanner(System.in);
        System.out.print("\nplease enter the desired positive number in order to find its root of two: ");

        double num = kb.nextDouble();
        double guess=0; 
        double r, g1, error;    
        if (num>=0){
            guess = num/2;
            do{
                r = num/guess;
                g1 = guess;
                guess = (guess+r)/2;
                error = (guess-g1)/guess;
                if (error<0){
                    error = -error;
                }
            }

            while(error>0.01);
            System.out.println("The square root of the number " + num +" is equal to " +guess);

        } else {
            System.out.println("Sorry the number that you entered is not a positive number, and it does not have a root of two");
        }
    }
}

Answer 1

添加一个新计数器，该计数器仅在(以前的)退出循环条件下增加。

int exit = 0;

do {
  ...
  if (error <= 0.01) {
    exit++;
  }
} while (exit < 2);