對一個double四捨五入，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;
            }
        }
     }
 }