为什么＆QUOT; ABCD＆QUOT; .StartsWith（QUOT;＆QUOT;）返回true？ [英] Why does "abcd".StartsWith("") return true?

问题描述

标题是整个问题。有人可以给我一个理由，为什么出现这种情况？

Title is the entire question. Can someone give me a reason why this happens?

推荐答案

是 - 因为它没有与空字符串开始。事实上，空字符串在逻辑上每对字符之间。

Yes - because it does begin with the empty string. Indeed, the empty string logically occurs between every pair of characters.

这样说吧：什么定义的开头你可以给将preclude呢？这里有一个简单的定义开始与这并不：

Put it this way: what definition of "starts with" could you give that would preclude this? Here's a simple definition of "starts with" that doesn't:

X与开始出现Y如果x匹配的Y的第一 y.L​​ength 字符。

"x starts with y if the first y.Length characters of x match those of y."

这是另一种（当量）的定义：

An alternative (equivalent) definition:

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