如何确定是否一个小数/双为整数？

问题描述：

我如何判断一个小数或双值为整数？

How do I tell if a decimal or double value is an integer?

例如：

decimal d = 5.0; // Would be true
decimal f = 5.5; // Would be false

或

double d = 5.0; // Would be true
double f = 5.5; // Would be false

我想知道这种情况的原因是，这样我可以编程方式确定如果我想使用的输出的ToString（NO）值或的ToString（N2）。如果没有小数点值，那么我不想证明。

The reason I would like to know this is so that I can determine programmatically if I want to output the value using .ToString("N0") or .ToString("N2"). If there is no decimal point value, then I don't want to show that.

答

有关浮点数， N％1 == 0 通常是检查是否有路任何过去的小数点。

For floating point numbers, n % 1 == 0 is typically the way to check if there is anything past the decimal point.

    public static void Main (string[] args)
    {
        decimal d = 3.1M;
        Console.WriteLine((d % 1) == 0);
        d = 3.0M;
        Console.WriteLine((d % 1) == 0);
    }

输出：

False
True

如何确定是否一个小数/双为整数？

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