题解 |HJ97 #记负均正#

import java.util.*;

// 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) {
        Scanner scanner = new Scanner(System.in);
        int anInt = scanner.nextInt();
        int count = 0;
        int sum = 0;
        int zeroNum = 0;
        for (int i = 0; i < anInt; i++) {
            int num = scanner.nextInt();
            if (num < 0) {
                count++;
            } else if (num > 0) {
                //正数的和
                sum += num;
            } else {
                //0的个数
                zeroNum++;
            }
        }
        System.out.print(count + " ");
        if (sum == 0) {

            System.out.print("0.0");
        } else {
            float result = (float) sum / (anInt - count - zeroNum);
            String format = String.format("%.1f", result);
            System.out.print(format);
        }


    }
}

需要记得考虑0/0的情况

以及保留一位小数string.format（”%.1f“,result）;