Each test performs a comparison against the argument and returns true or false.
每次测试都会比较自变量，并返回真或假。
The feof command detects whether you have already read to the end of the file and returns True or False.
feof命令将检测您是否已经读到文件的末尾并返回True或False。
Words are separated by hyphens, and the function's name ends with a question mark, indicating it is a predicate in that it returns true or false.
单词均以连字符分隔，并且此函数的名字是以一个问号结尾的，用以表示此函数是一个断言，因它会返回 true 或 false。
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