Java语言程序设计基础篇第10版第5章习题答案

 1 public class Demo {
 2     public static void main(String[] args) {
 3         java.util.Scanner input = new java.util.Scanner(System.in);
 4         int num = input.nextInt();
 5         int count=0;
 6         int a=0,b=0;
 7         float sum=0;
 8         while(num!=0){
 9             if(num>0)
10                 a++;
11             else
12                 b++;
13             sum+=num;
14             num=input.nextInt();
15             count++;
16         }
17         if(count!=0)
18             System.out.println(a+","+b+","+sum+","+sum/count);
19         else
20             System.out.println("No numbers are entered except 0");
21     }
22 }

5.1