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请教一下，Presentation Error 是什么噢？

Posted by 20111436 at 2012-05-25 20:44:56 
#include<stdio.h>

int main()
{
	int i;
	double a[12],s,sum;
	s=0;
	for(i=0;i<12;i++)
	{
		scanf("%lf",&a[i]);
		printf("\n");
	}
	for(i=0;i<12;i++)
	{
		s+=a[i];
	}
	sum=s/12;
	printf("$%4.2lf\n",sum);
	return 0;
}
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