统计正数和负数的个数，然后计算这些数的平均值 Exercise05_01

 import java.util.Scanner;
 /**
  * @author 冰樱梦
  *
  *
  */
 public class Exercise05_01{
     public static void main(String[] args){
         Scanner input=new Scanner(System.in);
         int positives=0,negatives=0,number,sum=0;
         double total=0,average=0;
         while(true){
             System.out.println("Enter an integer, the input ends if it is 0:");
             number=input.nextInt();
             total+=number;
             if(total==0){
                 System.out.println("No number are entered except 0");
                 break;
             }
             else {
                 if(number>0) positives++;
                 if(number<0) negatives++;
                 sum++;
                 if(number==0){
                     average=total/sum;
                     System.out.println("The number of positives is " + positives);
                     System.out.println("The number of negatives is " + negatives);
                     System.out.println("The total is " + total);
                     System.out.println("The average is " + average);
                 }
             }

         }

     }
 }