Objective-C浮点加法错误 [英] Objective-C floating point addition error

问题描述

可能重复：

在Objective-C中浮动的问题

已经把这个问题简化到了我可以得到的那么简单。随意尝试相同的事情，并告诉我，如果你得到相同的错误，你可能有什么解决方案。

  float total = 200000.0f + 154196.8f;我已经在几台电脑上试过了。 
 NSLog（@total：％f，total）; 
  

输出结果为：

 总计：354196.812500 
  

如果有人有任何合理的解释，分享它。

解决方案

我建议你刷上你的花车

http://www.altdevblogaday.com / 2012/05/20 / thats-not-normal-performance-of-odd-floats /

如果您需要更高的精确度，请使用double。 / p>

另外 http://randomascii.wordpress.com/2012/03/08/float-precisionfrom-zero-to-100-digits-2/

Possible Duplicate:
Trouble with floats in Objective-C

I have broken this problem down to about as simple as i can get it. Feel free to try the same thing and tell me if you get the same error and what solution you might have. I have already tried it on several computers.

float total = 200000.0f + 154196.8f;
NSLog(@"total: %f", total);

The output is:

total: 354196.812500

If anyone has any sort of logical explanation, feel free to share it.

解决方案

I'd suggest you brush up on your floats

http://www.altdevblogaday.com/2012/05/20/thats-not-normalthe-performance-of-odd-floats/

If you need higher precision use a double.

Additionally http://randomascii.wordpress.com/2012/03/08/float-precisionfrom-zero-to-100-digits-2/

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