【Java例题】4.5异常处理

package chapter4;
import java.util.*;

public class demo5 {
    public static void main(String[] args)throws Exception {
        Scanner sc=new Scanner(System.in);
        try {
            double num=sc.nextDouble();
            if(Math.floor(num)!=num) {
                throw new Exception("出现小数，结果:"+Math.floor(num));
            }
        }catch(NumberFormatException e){
            System.out.println("0");
        }
    }
}