feof虽说是检测文件流结束符，但是要先读才能判断。也就是说，如果是一个空文件，在feof之前没有读过一次，feof的返回值依然是0。这就是为什么用feof复制文件时，目标文件比源文件要多一些东西的原因。
参考：
http://baike.baidu.com/view/656648.htm
http://math.hdu.edu.cn/?41/viewspace-37
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