学步园

package Number;
import java.util.*;
import java.util.Scanner;
public class Change {

	public static void main(String[] args) {
	Scanner reader=new Scanner(System.in);
	double sum=0;
	int m=0;
	while(reader.hasNextDouble()){
		double x=reader.nextDouble();
		try{
			if(x<0||x>100)
			x=Integer.parseInt("x<0||x>100");
			else{
				m=m+1;
				sum=sum+x;
			}
		}
		catch(NumberFormatException e){
			System.out.println("发生异常："+e.getMessage());
		}
	}
	System.out.printf("%d个数的和为%f\n",m,sum);
	System.out.printf("%d个数的平均值为%f\n",m,sum/m);
	}
}

怎么用end退出呢？