C中的FILE结构中的r +是什么? [英] what is r+ in FILE structure in C?

问题描述

我正在以下地址阅读一些C文本: https://cs.senecac.on.ca/~btp100/pages/content/files.html

I am reading some C text at the address: https://cs.senecac.on.ca/~btp100/pages/content/files.html

在"OPENING A FILE"部分中，作者写道:

in the section "OPENING A FILE", the author wrote:

""r+" - opens the file for reading and possibly writing".

我不明白为什么作者说"possibly writing".为什么不使用"reading and writing".在某些情况下，如果使用"r+"，我们将无法写入文件?

I dont understand why the author said "possibly writing". Why not "reading and writing". are there some cases we cannot write to file if using "r+"?

推荐答案

措辞不佳.应该是:

r+
    Open file for update (reading and writing).

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