确保c ++十进制比较是正确的 [英] Make sure c++ decimal comparison is correct

问题描述

我有两个双变量。双a = 0.10000，双b = 0.1。如何确保比较（a == b）始终是真的？

解决方案

如果您对 == 在 doubles 或 floatats （你应该是）你可以随时检查它们是否在一个很小的公差范围内。

  bool same = fabs（ab）< 0.000001; 
  

I have two double variable. double a = 0.10000, double b = 0.1. How can I make sure the comparison (a == b) is always true ?

解决方案

If you are being paranoid about using == on doubles or floats (which you should be) you can always check that they are close within a small tolerance.

bool same = fabs(a-b) < 0.000001;

这篇关于确保c ++十进制比较是正确的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！