c# - 浮点运算错误

This question already has answers here:

Why am I getting the wrong result when using float? [duplicate]
                                
                                    （4个答案）
                                
                        
                        
                            Float is converting my values
                                
                                    （4个答案）
                                
                        
                                6年前关闭。
            
                    
结果必须是806603.77，但是为什么我得到806603.8？

float a = 855000.00f;
float b = 48396.23f;

float res = a - b;
Console.WriteLine(res);
Console.ReadKey();

最佳答案

您应该改用decimal，因为float仅具有7位精度的32-bit，这就是结果不同的原因，另一方面，decimal具有28-29位精度的128-bit。

decimal a = 855000.00M;
decimal b = 48396.23M;

decimal res = a - b;
Console.WriteLine(res);
Console.ReadKey();

输出：806603.77