floor ？



使用它之后，你只需格式化你的号码就可以了再次.00小数，这就是它

What is wrong with floor?

After using it, you just have to format you number to have .00 decimals again and that's it

让yoi试过 Decimal.Truncate（Decimal）方法（系统）| Microsoft Docs [ ^ ] - 这就是它的目的......

Have yoi tried Decimal.Truncate(Decimal) Method (System) | Microsoft Docs[^] - that is what it is designed to do...

decimal d = 3.31M;
Console.WriteLine("{0}, {1}, {1:0.00}", d, decimal.Truncate(d));

Dim d As Decimal = 3.31D
Console.WriteLine("{0}, {1}, {1:0.00}", d, Decimal.Truncate(d))

首先，我强烈建议阅读：

十进制数据类型（Visual Basic）| Microsoft Docs [ ^ ]

整数数据类型（Visual Basic）| Microsoft Docs [ ^ ]

隐式和显式转换（Visual Basic）| Microsoft Docs [ ^ ]

如何：在Visual Basic中将对象转换为另一种类型Microsoft Docs [ ^ ]

类型转换函数（Visual Basic）| Microsoft Docs [ ^ ]

标准数字格式字符串| Microsoft Docs [ ^ ]

自定义数字格式字符串| Microsoft Docs [ ^ ]

最重要的是：

每个计算机科学家应该知道的关于浮点算术的内容 [ ^ ]





现在，看看下面的代码：

First of all, i'd strongly recommend to read about:
Decimal Data Type (Visual Basic) | Microsoft Docs[^]
Integer Data Type (Visual Basic) | Microsoft Docs[^]
Implicit and Explicit Conversions (Visual Basic) | Microsoft Docs[^]
How to: Convert an Object to Another Type in Visual Basic | Microsoft Docs[^]
Type Conversion Functions (Visual Basic) | Microsoft Docs[^]
Standard Numeric Format Strings | Microsoft Docs[^]
Custom Numeric Format Strings | Microsoft Docs[^]
And the most important:
What Every Computer Scientist Should Know About Floating-Point Arithmetic[^]


Now, take a look at below code:

Dim df As Decimal = 3.31D
Dim di As Integer = df

Console.WriteLine("{0} => {1}", df, di)
df=di
Console.WriteLine("{0:0.00} => {1}", df, di)