作业3.2
#include<stdio.h>
int main(void)
{
int count,num;
double grade,total;
num=0;
total=0;
count=0;
printf("Enter grades:");
scanf("%lf",&grade);
while(grade>=0){
total=total+grade;
num++;
if(grade<60)
count++;
scanf("%lf",&grade);
}
if(num!=0){
printf("Grade average is %.2f\n",total/num);
printf("Number of failures is %d\n",count);
}
else {
printf("Grade average is 0\n");
}
return 0;
}