c# - 零有不同的十进制值吗？

Question

我正在使用 C# 代码工作，该代码通过以下方式分配十进制值。这些值是相同的还是有区别？

decimal a = 0;
decimal b = 0m;
decimal c = 0.00m;

Answer 1

只是在其他好的答案中添加一点点更实用的信息

小数有许多0的内部表示，但是当比较时它们都将等于零

Decimal Struct

The binary representation of a Decimal value consists of a 1-bit sign, a 96-bit integer number, and a scaling factor used to divide the 96-bit integer and specify what portion of it is a decimal fraction. The scaling factor is implicitly the number 10, raised to an exponent ranging from 0 to 28. Therefore, the binary representation of a Decimal value the form, ((-296 to 296) / 10(0 to 28)), where -(296-1) is equal to MinValue, and 296-1 is equal to MaxValue.

The scaling factor also preserves any trailing zeros in a Decimal number. Trailing zeros do not affect the value of a Decimal number in arithmetic or comparison operations. However, trailing zeros might be revealed by the ToString method if an appropriate format string is applied.

改变比例因子的例子

string GetBits(decimal d)
{
   var bits = decimal.GetBits(d);
   return $"{d==0} {d,31}  {bits[3],10:X8}{bits[2],10:X8}{bits[1],10:X8}{bits[0],10:X8}";
}

Console.WriteLine(GetBits(0));
Console.WriteLine(GetBits(0.0m));
Console.WriteLine(GetBits(0.000m));
// Manually set the Scaling Factor and Sign
Console.WriteLine(GetBits(new decimal(0,0,0,true,10)));

输出

Equals 0                    ToString       Other        Hi       Mid        Lo
------------------------------------------------------------------------------
True                               0    00000000  00000000  00000000  00000000
True                             0.0    00010000  00000000  00000000  00000000
True                           0.000    00030000  00000000  00000000  00000000
True                    0.0000000000    800A0000  00000000  00000000  00000000