问题描述
我正在为我的c ++课程开发一个项目而我遇到了麻烦
使用or运算符将一个字符串与另外两个字符串进行比较。它看起来像这样：
if（answer3 == answer1 || answer2）
我需要通过另一个命令吗？或者我应该以完全不同的方式做一个
？
任何建议都会非常感激。
I''m working on a project for my c++ class and I am having trouble
comparing one string to two others using the or operator. It looks
something like this:
if(answer3 == answer1 || answer2)
Is there another command I need to through in there or should I do it a
completely different way?
Any suggestions would be most appreciated.
推荐答案
if（answer3 == answer1 || answer3 == answer2）
-
John Carson
if(answer3 == answer1 || answer3 == answer2)
--
John Carson
你不能这样做，因为（||）在==之前进行评估。
你必须使用两个比较（每个答案一个）和/或结果。
-
Ian Collins。
You can''t do that because the or (||) is evaluated before the ==.
You have to use two comparisons (one for each answer) and or the result.
--
Ian Collins.
if（answer3 == answer1 || answer3 == answer2）
-
if(answer3 == answer1 || answer3 == answer2)
--
John Carson
||是一个捷径运算符，因此如果第一个表达式为真，那么第二个表达式就不会被计算出来。所以，如果（answer3 ==
answer1）证明是真的那么（answer3 == answer2）就不会执行
了。不确定你是否想要这样。
另外，我建议你使用strcmp进行字符串比较而不是
==运算符除非当然，如果你超载了==
运算符。
The || is a short cut operator hence if the first expression is true
the second expression would not be calculated. So, if (answer3 ==
answer1) turns out to be true the (answer3 == answer2) would not be
carried out. Not sure if you want it that way or not.
Also, I would suggest you to use strcmp for string comparison instead
of the == operator unless of-course if you have overloaded the ==
operator.
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