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)。
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。
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。
This function moves the file pointer from its current position to a new position, forward or backward, specified by the number of bytes.
整个函数将文件指针从当前位置向前或向后移动移动到一个新的位置。
To save the current position and time zone information as the defaults which will be used in all future runs of the program, select save defaults from the File menu.
在程序任何情况下保存当前位置和时区为默认，在文件菜单中选择保存为默认值。
To save the current position and time zone information as the defaults which will be used in all future runs of the program, select save defaults from the File menu.
在程序任何情况下保存当前位置和时区为默认，在文件菜单中选择保存为默认值。
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