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.

youdao

若要使用这个库，可以打开此文档并读取文件，然后依次循环主控制块内的每个块，如清单1所示。

You use the library by opening the document and reading the file, followed by looping through each block in the main control block, as shown in Listing 1.

youdao

现在，要从全部共享内存文件读取和打印所有记录，创建一个循环。

Now, to read and print all the records from the entire Shared memory file, create a loop.

youdao