题解 | #记负均正#

#include <stdio.h>
int main() {
    //输入要输入的整数个数：
	int n;
	scanf("%d", &n);
	int i = 0;
    //负数个数
	int negative_number = 0;
    //正数个数
	int positive_number = 0;
    //正数的和
	int sum = 0;
    //正数平均值
	int average;
    //输入整数放入数组
	
	
	int arr[n];
	for (i = 0; i < n; i++)
	{
		scanf("%d", &arr[i]);
	}

	int j = 0;
	for (j = 0; j < n; j++)
	{
		if (arr[j] < 0)
		{
			negative_number++;
		}
		if (arr[j] > 0)
		{
			sum = sum + arr[j];
			positive_number++;
		}
	}

	printf("%d ", negative_number);

	if(positive_number!=0)
	printf("%.1f", (float)sum / positive_number);
	else
	 printf("%.1f",0);

}