当输入文件中没有其他字符可供读取时，循环结束。

The loop completes when there are no more characters to read in the in file.

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如何读取多个文件在一个循环？

How to read from multiple files in one loop?

youdao

如何读取多个文件在一个循环？

How to read from multiple files in one loop?

youdao