题解 | 四舍五入

import java.util.Scanner;

public class Main
 {
     
    public static void main(String[] args) 
    {
        final double STD=1e-14;
        Scanner scanner = new Scanner(System.in);
        double d= scanner.nextDouble();
        int n;
        double dd=d-(int)d;
        if((dd+STD)<0.5)
        n=(int)d;
        else
        n=(int)d+1;
        System.out.println(n);
    }
}