为什么得不到正确的结果

Question

# include<stdio.h>int main(){ int n,i; double sum,grade,count; printf("entern:\n"); scanf("%d",&n); sum = 0; count = 0; for(i=1;i<=n;i++){ printf("enter grade#%d：",i); scanf("%d",&grade); sum = sum+grade; if(grade<60) count++; } printf("average=%.2f\n",sum/n); printf("count=%d\n",count); return 0;}编译过了 没有语法问题 但是最后运行的的结果不正确 都是零

Answer 1

# include<stdio.h>
int main()
{
	int n,i;
	double sum,grade,count;
	
	printf("entern:\n");
	scanf("%d",&n);
	
	sum = 0;
	count = 0;
	
	for(i=1;i<=n;i++){
		printf("enter grade#%d：",i);
		scanf("%lf",&grade);//%d改成%lf
		sum = sum+grade;
		printf("sum=%f\n",grade);
		if(grade<60)
			count++;
	}
	
	printf("average=%.2f\n",sum/n);
	printf("count=%lf\n",count);//这里也是改成%lf
	return 0;
}