Depending on the flavor of UNIX, the size of the file might also be reported as the current position the application is reading in the file (offset).

根据UNIX版本的不同，可能将文件的大小报告为应用程序在文件中进行读取的当前位置(偏移量)。

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The ftell() function returns the current position in an open file.

函数的作用是：返回文件指针当前的读/写的位置。

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Sets the next instruction to be executed, according to the cursor position in the current source file.

根据当前源文件中的光标位置设置要执行的下一个指令。

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