编写程序实现从键盘输入n个学生成绩，用-1表示输入结束，输出平均成绩和不及格的人数。

#include<stdio.h>
int main()
{ float score,sum=0,average,num1,sum1;
int n=0;
scanf("%f",&score);
while(score>=0)
{
	sum+=score;
	n++;
	scanf("%f",&score);
}
if(n!=0)average=sum/n;
printf("%-6.2f\n",average);
num1=1,sum1=2;
if(score<60)
	{
		num1++;
		sum1+=num1;
		
		
    }
printf("%.0f\n",sum1);

return 0;
}