题解 | #记负均正II#

//题不难，细心最重要，注意分情况判断，while处理输入，输出语句需要放外面

import java.util.*; public class Main{

public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    //count0表示0的个数，count1表示负数的个数，count2表示非负数的个数, sum表示非负数的和
    int count0 = 0, count1 = 0, count2 = 0, sum = 0;
    while(sc.hasNext()){
        int num = sc.nextInt();
        if(num < 0){
            count1++;
        }else if(num == 0){
            count0++;
            sum += num;
            count2++;
        }else{
            sum += num;
            count2++;
        }
    }
    if(count0 == count2){  //表示没有正数
        System.out.println(count1 + "\n" + "0.0" + "\n");
    }else{
        System.out.println(count1 + "\n" + String.format("%.1f", sum * 1.0 / count2) +"\n");
    }
}

}