对一个double四舍五入，返回int

import java.util.*;public class Main{    public static void main(String[]args){        Scanner s=new Scanner(System.in);        double a=s.nextDouble();        for(double i=0;i>=0;i++){            if((a-i)<0.5){                System.out.println((int)i);                break;            }else if(((a-i)>=0.5&&(a-i)<1)) {            System.out.println((int)(i+1));            break;            }        }     } }