检测从双倍转换为浮点时的精度损失 [英] Detecting precision loss when converting from double to float

问题描述

我写了一段代码，我必须从double转换为float值。我正在使用boost :: numeric_cast做这个转换，将提醒我任何溢出/下溢。不过，我也有兴趣知道，如果这种转换导致一些精度损失或不。

例如

  double source = 1988.1012; 
 float dest = numeric_cast< float>（source）; 
  

生成具有值的目标值1988.1

有没有什么办法可以检测到这种精度损失/四舍五入
解决方案

你可以将浮点数转换回加倍和比较这个双原来的 - 这应该给你一个公平的指示，是否有一个精度损失。

I am writing a piece of code in which i have to convert from double to float values. I am using boost::numeric_cast to do this conversion which will alert me of any overflow/underflow. However i am also interested in knowing if that conversion resulted in some precision loss or not.

For example

    double source =  1988.1012;
    float dest = numeric_cast<float>(source);

Produces dest which has value 1988.1

Is there any way available in which i can detect this kind of precision loss/rounding

解决方案

You could cast the float back to a double and compare this double to the original - that should give you a fair indication as to whether there was a loss of precision.

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