第三章例3-3

#include<stdio.h>
int main(void)
{
	int count,i,n;
	double grade,total;

	printf("Enter n:");
	scanf("%d",&n);
	total=0;
	count=0;
	for(i=1;i<=n;i++){
		printf("Enter grade #%d:",i);
		scanf("%lf",&grade);
		total=total+grade;
		if(grade<60){
			count++;
		}
	}
	printf("Grade average=%.2f\n",total/n);
	printf("Number of failures=%d\n",count);
	return 0;
}