C# 编译器数字文字
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C# compiler number literals
提问by Phil Wright
Does anyone know the full list of C# compiler number literal modifiers?
有谁知道 C# 编译器数字文字修饰符的完整列表？
By default declaring '0' makes it an Int32 and '0.0' makes it a 'Double'. I can use the literal modifier 'f' at the end to ensure something is treated as a 'Single' instead. For example like this...
默认情况下，声明 '0' 使其成为 Int32，而声明 '0.0' 使其成为 'Double'。我可以在末尾使用文字修饰符 'f' 来确保某些东西被视为'Single'。比如像这样...
var x = 0; // x is Int32
var y = 0f; // y is Single
What are the other modifiers I can use? Is there one for forcing to Double, Decimal, UInt32? I tried googling for this but could not find anything. Maybe my terminology is wrong and so that explains why I am coming up blank. Any help much appreciated.
我可以使用哪些其他修饰符？是否有强制为 Double、Decimal、UInt32 的方法？我尝试谷歌搜索，但找不到任何东西。也许我的术语是错误的，所以这解释了为什么我会出现空白。非常感谢任何帮助。
采纳答案by user7116
var y = 0f; // y is single
var z = 0d; // z is double
var r = 0m; // r is decimal
var i = 0U; // i is unsigned int
var j = 0L; // j is long (note capital L for clarity)
var k = 0UL; // k is unsigned long (note capital L for clarity)
From the C# specification2.4.4.2 Integer literals and 2.4.4.3 Real literals. Take note that L and UL are preferred as opposed to their lowercase variants for clarity as recommended by Jon Skeet.
来自C# 规范2.4.4.2 Integer literals 和 2.4.4.3 Real literals。请注意，为了清楚起见，L 和 UL 是首选，而不是它们的小写变体，正如Jon Skeet推荐的那样。
回答by Nic Wise
You might want to start by looking at the C# language spec. Most of the types are listed in there, and have a suffix:
您可能希望首先查看 C# 语言规范。大多数类型都列在那里，并有一个后缀：
- L = long
- F = float
- U = uint
- ulong's are a little different
- m = decimal (money)
- D = double
- L = 长
- F = 浮动
- U = 单位
- ulong 的有点不同
- m = 十进制（钱）
- D = 双倍
Of course, if you stop using varthen you get around the whole problem, and your code becomes more readable (ok, thats subjective, but for something like this, it's more readable by other people:
当然，如果你停止使用var那么你就解决了整个问题，你的代码变得更具可读性（好吧，这是主观的，但对于这样的事情，其他人更容易阅读：
var x = 0; //whats x?
float x = 0; //oh, it's a float
byte x = 0; // or not!
回答by Marc Gravell
If you don't want to have to remember them, then the compiler also accepts a cast for the same purpose (you can check the IL that the effect is the same - i.e. the compiler, not the runtime, does the cast). To borrow the earlier example:
如果您不想记住它们，那么编译器也接受出于相同目的的强制转换（您可以检查 IL 的效果是否相同 - 即编译器而不是运行时执行强制转换）。借用前面的例子：
var y = (float)0; // y is single
var z = (double)0; // z is double
var r = (decimal)0; // r is decimal
var i = (uint)0; // i is unsigned int
var j = (long)0; // j is long
var k = (ulong)0; // k is unsigned long
And for the record, I agree that "var" is a bad choice here; I'll happily use var for a SortedDictionary<SomeLongType, SomeOtherLongType>, but for "int" it is just lazy...
为了记录，我同意“var”在这里是一个糟糕的选择；我很乐意将 var 用于 SortedDictionary<SomeLongType, SomeOtherLongType>，但对于“int”，它只是懒惰...
