The standardinputfile provides a way to send data to a process.
标准输入文件提供了一个将数据传送到一个进程的方法。
2
In this code, you start by declaring a file pointer to standardinput so that you can get interactive information from the keyboard during the spell-check process.
在这段代码中，您首先要为标准输入声明一个文件指针，以便您能够在拼写检查过程中从键盘获得交互式信息。
3
This input can come either from a file specified as the last command line argument, or from standardinput if no file name argument is given.