PTA 7-10 迭代法求正数的平方根 (10分)

 1 import java.util.Scanner;
 2 public class Main {
 3     public static void main(String[] args)   {
 4         Scanner sc=new Scanner(System.in);
 5         double a=sc.nextDouble();
 6         double eps=sc.nextDouble();
 7         int sum=1;
 8         double temp=a/2,item;
 9         item=0.5*temp+0.5*(a/temp);
10         while(Math.abs(item-temp)>=eps) {
11             temp=item;
12             item=0.5*temp+0.5*(a/temp);
13             sum++;
14         }
15         double k;
16         k=item*0.5+temp*0.5;
17         System.out.printf("%.4f %d",k,sum);
18     }
19 }