描述: 求解一个数的平方根,返回值不一定指的是整数
import java.util.*; public class Main { static Scanner in = new Scanner(System.in); static double sqrt(double t) { double low=0; double high=t; double mid=low+(high-low)/2; while(high-low>1e-7) { if(mid*mid>t) high=mid; else if(mid*mid<t) low=mid; else if(Math.abs(mid*mid-t)<1e-7) { return mid; } mid=low+(high-low)/2; } return mid; } public static void main(String[] args) { while(in.hasNext()){ double n = in.nextDouble(); System.out.println(sqrt(n)); } } }