附加“a +”会自动将光标放到最后

Question

我想用c打开一个文件然后添加一些内容并关闭它。我只想知道 fopen 中的 a + 会自动导航到文件的最后一个字符。

Answer 1

是的。

为什么不尝试或阅读手册？

这是：

   r      Open text file for reading.  The stream is positioned at the beginning of the file.

   r+     Open for reading and writing.  The stream is positioned at the beginning of the file.

   w      Truncate file to zero length or create text file for writing.  The stream is positioned at the  beginning  of  the
          file.

   w+     Open for reading and writing.  The file is created if it does not exist, otherwise it is truncated.  The stream is
          positioned at the beginning of the file.

   a      Open for appending (writing at end of file).  The file is created if it does not exist.  The stream is  positioned
          at the end of the file.

   a+     Open  for  reading and appending (writing at end of file).  The file is created if it does not exist.  The initial
          file position for reading is at the beginning of the file, but output is always appended to the end of the file.