本文介绍了确定 NSNumber 是否为 NaN的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何确定 Cocoa NSNumber 是否代表 NaN(不是数字)?
How can I determine if a Cocoa NSNumber represents NaN (not a number)?
例如,当我解析包含无效(非数字)内容的字符串时,就会出现这种情况.
This emerges, for example, when I parse a string that has an invalid (non-numeric) contents.
推荐答案所以,我发现类属性 [NSDecimalNumber notANumber] 就是为了这个目的.在某些语言中 NaN != NaN,但在 Cocoa 中并非如此.
So, I found out that the class property [NSDecimalNumber notANumber] is just for this purpose. In some languages NaN != NaN, but this isn't the case in Cocoa.
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确定 NSNumber 是否为 NaN
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