c++警告： Using the result of an assignment as a condition without parentheses
谷歌了一下，出现这个错误的缘由是条件赋值没有加括号。xcode 国外有大佬调侃说，这不是你代码的错误，而是那迂腐的编译器给出的警告。固然，在上图的那个警告是能够忽略的，而另一种状况就应该注意了。code 好比：if( n=2)这类的，你原本是想表达 n==2的，但你不当心写了n=1, 这显然会出现大问题，解决的办法，xcode已经给出来了。blog 点击警告框的小三角，xcode给出了2条
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