什么是一个布尔值在C＃中的二进制重新presentation [英] What is the binary representation of a boolean value in c#

问题描述

我知道一个布尔值是1字节（8位）
不过，我想知道是什么，是它的二进制重新presentation。
例如
十进制=>二进制
4 => 100（0000 0100）
8 => 1000（0000 1000）
布尔值=> ???

I know that a boolean value is 1 byte (8 bits long) But I would like to know is what is its binary representation. e.g. decimal => binary 4 => 100 (0000 0100) 8 => 1000 (0000 1000) bool value => ???

推荐答案

布尔是一个内置在C＃中的基本类型。任何基础重新presentation将是一个实现细节。

bool is a built-in basic type in C#. Any underlying representation would be an implementation detail.

的 C＃4.0语言规范的第4.1.8规定：

The C# 4.0 Language Specification states in section 4.1.8:

的布尔键入重presents布尔逻辑量。键入布尔的可能值是真正和假。

The bool type represents boolean logical quantities. The possible values of type bool are true and false.

布尔和其他类型之间不存在标准转换。尤其是，布尔类型与整型截然不同的和独立的，而布尔值不能就地使用的积分值，并且反之亦然。

No standard conversions exist between bool and other types. In particular, the bool type is distinct and separate from the integral types, and a bool value cannot be used in place of an integral value, and vice versa.

在C和C ++语言中，零整数或浮点值或空指针可以转换为布尔值假和非零整数或浮点数值，或非空指针可以转换为布尔值真正。在C＃中，这种转换是通过显式地将整数或浮点值与零进行比较，或者比较明确的对象引用为空来实现的。

In the C and C++ languages, a zero integral or floating-point value, or a null pointer can be converted to the boolean value false, and a non-zero integral or floating-point value, or a non-null pointer can be converted to the boolean value true. In C#, such conversions are accomplished by explicitly comparing an integral or floating-point value to zero, or by explicitly comparing an object reference to null.

如果我们采取这种更深层次的原因看相应​​的类型是如何在specied中的通用中间语言的（CIL），我们将看到一个CLI布尔类型在内存占用1个字节。在通用语言基础结构的（CLI）规范说，在分区第三，部分1.1.2：

If we take this one level deeper and see how the corresponding type is specied in the Common Intermediate language (CIL) we will see that a CLI Boolean type occupies 1 byte in memory. The Common Language Infrastructure (CLI) specification says in Partition III, section 1.1.2:

一个CLI布尔类型在存储器中占用1个字节。全零的位模式表示false值。一点点
  设置（类似于一个非零整数）中任一个或多个比特图案表示真值

A CLI Boolean type occupies 1 byte in memory. A bit pattern of all zeroes denotes a value of false. A bit pattern with any one or more bits set (analogous to a non-zero integer) denotes a value of true.

不过，这在另一个层面上规定和C＃中你不应该去关心;即使CLI规范的未来版本中可能会改变布尔类型的再presentation，或者C＃编译器决定在C＃中映射布尔到不同的东西，你的C＃code仍然具有相同的语义。

However, this is specified on another level and from within C# you should not have to care; even if a future version of the CLI specification might change the representation of the boolean type, or if the C# compiler decided to map a bool in C# to something different, your C# code would still have the same semantics.

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