problem when get floatValue from NSString

I am confusing and don't know why it's happen that when I get float from string.

I have an array of NSString, and when I get floatValue from these string object, they are not correct, for an example:

NSString object is "71.4" => floatValue is 71.4000013

NSStrin开发者_如何学编程g obtect is "71.45"=> floatValue is 71.4489839

Does anyone know the root cause and how to resolve, please help me!

Thanks!

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Welcome to the joys of floating point. These ARE 'correct'. Floating point values are very inaccurate due to how they're stored on the system.

Here is a much better explanation than I'll be able to give.

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Try doubleValue.