大学平时成绩作业和出勤具体怎么算

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#include
int main()
{
float chengji;
int count_90=0;
int sum=0;
int count_stu=0;
while(true)
{
scanf("%g",&chengji);
if(chengji>=0)
{
sum+=chengji;
count_stu++;
if(chengji>=90)
{
count_90++;
}
}
if(chengji<0)
{
float pingjun=sum*1./count_stu;
printf("平均分是：%g\n90分以上的人有%d人",pingjun,count_90);
return 0;
}
}
return 0;
}