c++警告： Using the result of an assignment as a condition without parentheses
谷歌了一下，出現這個錯誤的緣由是條件賦值沒有加括號。xcode 國外有大佬調侃說，這不是你代碼的錯誤，而是那迂腐的編譯器給出的警告。固然，在上圖的那個警告是能夠忽略的，而另一種狀況就應該注意了。code 好比：if( n=2)這類的，你原本是想表達 n==2的，但你不當心寫了n=1, 這顯然會出現大問題，解決的辦法，xcode已經給出來了。blog 點擊警告框的小三角，xcode給出了2條
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