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????????????????

Posted by B08310208 at 2009-08-16 10:07:07 on Problem 1004
why 
 #include<stdio.h>
int main()
{
	int i;
	float sum=0.0,a;
		for(i=0;i<12;i++)
		{
			scanf("%f",&a);
			sum+=a;	
		}
		printf("$%.2f\n",sum/12);
}
将上面的float换成double再改变一下格式就错了????????????

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