数字后面的字母，叫什么? [英] Letter after a number, what is it called?

问题描述

这叫什么?

double  d1 = 0d;
decimal d2 = 0L;
float   d3 = 0f;

我在哪里可以找到我可以使用的字符的参考?如果我想将 0 转换为 short，我需要哪个字母?

And where can I find a reference of characters I can use? If I want to cast 0 to short, which letter I need?

推荐答案

最好的来源是 C# 规范，特别是 文字.

The best source is the C# specification, specifically section Literals.

相关位:

整数字面量的类型确定如下:

The type of an integer literal is determined as follows:

• 如果字面量没有后缀，则它具有可以表示其值的以下类型中的第一个:int、uint、long, ulong.
• 如果文字以 U 或 u 为后缀，则它具有可以表示其值的以下类型中的第一个:uint、ulong.
• 如果文字以 L 或 l 为后缀，则它具有以下类型中的第一个可以表示其值:long、ulong.
• 如果文字以 UL、Ul、uL、ul、LU、Lu、lU 或 lu 为后缀，则为 ulong 类型.

• If the literal has no suffix, it has the first of these types in which its value can be represented: int, uint, long, ulong.
• If the literal is suffixed by U or u, it has the first of these types in which its value can be represented: uint, ulong.
• If the literal is suffixed by L or l, it has the first of these types in which its value can be represented: long, ulong.
• If the literal is suffixed by UL, Ul, uL, ul, LU, Lu, lU, or lu, it is of type ulong.

如果没有指定real_type_suffix，那么真实字面量的类型是double.否则，实数类型后缀决定实数字面量的类型，如下:

If no real_type_suffix is specified, the type of the real literal is double. Otherwise, the real type suffix determines the type of the real literal, as follows:

• 以 F 或 f 为后缀的实数是 float 类型.[…]

以 D 或 d 为后缀的实数是 double 类型.[…]

A real literal suffixed by D or d is of type double. […]

以 M 或 m 为后缀的实数是 decimal 类型.[…]

A real literal suffixed by M or m is of type decimal. […]

这意味着字母(或字母)被称为后缀".short 是没有办法用这种方式表示的，所以只能用 (short)0，或者只用 short x = 0;.

That means the letter (or letters) is called "suffix". There is no way to represent short this way, so you have to use (short)0, or just short x = 0;.

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