比较 Unity 中的浮点数

问题描述

我的场景中有 6 个 InputField.它们的内容类型是十进制.

I have 6 InputFields in my scene. Their content type is decimal.

我从这些输入字段中获取值并检查它们的总和是否等于 100.02.我在所有这些中输入 16.67.

I fetch values from these input fields and check if their sum is equal to 100.02. I enter 16.67 in all of them.

    float fireP   =  float.Parse(firePercentage.text);
    float waterP  =  float.Parse(waterPercentage.text);
    float lightP  =  float.Parse(lightPercentage.text);
    float nightP  =  float.Parse(nightPercentage.text);
    float natureP =  float.Parse(naturePercentage.text);
    float healthP =  float.Parse(healthPercentage.text);

    float total = fireP + waterP + lightP + nightP + natureP + healthP;

   if (total == 100.02f)
   {
     Debug.Log("It's equal");
   }
   else
   {
     Debug.Log(" Not equal. Your sum is = " + total);
   }

我在控制台日志中收到不相等.您的总和 = 100.02".无论如何知道为什么会发生这种情况?

I am getting " Not equal. Your sum is = 100.02" in my console log.Anyways has any idea why this might be happening ?

推荐答案

离16.67最近的float是16.6700000762939453125.

离100.02最近的float是100.01999664306640625

将前者与自身相加 5 次并不完全等于后者，因此它们比较起来不会相等.

Adding the former to itself 5 times is not exactly equal to the latter, so they will not compare equal.

在这种特殊情况下，以 1e-6 的顺序与容差进行比较可能是可行的方法.

In this particular case, comparing with a tolerance in the order of 1e-6 is probably the way to go.

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