题解 | #记负均正II#

打印格式

System.out.printf("%.1f\n", result);

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        int count = 0;
        int ZhengCount = 0;
        int sum = 0; 
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int a = in.nextInt();
            if (a > 0) {
                sum = sum + a;
                ZhengCount = ZhengCount + 1;
            } else {
                count = count + 1;
            }
        }
        System.out.println(count);
        if (ZhengCount == 0) {
            System.out.println(0.0);
            return;
        }
        double result  = (sum / 1.0) / ZhengCount;
        System.out.printf("%.1f\n", result);
    }
}