统计学生平均成绩

#include<stdio.h>
int main(void){
int counter,i,n;
double grade,total;
printf("Enter n:");
scanf("%d",&n);
total=0;
counter=0;
for(i=1;i<=n;i++){
printf("Enter grade #%d:",i);
scanf("%lf",&grade);
total=total+grade;
if(grade>=60){
counter++;
}
}
printf("Grade average=%.2f\n",total/n);
printf("Number of failure=%d\n",counter);
return 0;
}