c#中布尔值的二进制表示是什么

What is the binary representation of a boolean value in c#(c#中布尔值的二进制表示是什么)

问题描述

我知道布尔值是 1 个字节(8 位长)但我想知道它的二进制表示是什么.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

bool 是 C# 中内置的基本类型.任何底层表示都是实现细节.

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

C# 4.0 语言规范在第 4.1.8 节中声明:

The C# 4.0 Language Specification states in section 4.1.8:

bool 类型表示布尔逻辑量.bool 类型的可能值为 true 和 false.

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

bool 与其他类型之间不存在标准转换.特别是，bool 类型与整数类型截然不同，并且不能使用 bool 值代替整数值，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 false，以及非零整数或浮点值，或者非空指针可以转换为布尔值true.在 C# 中，此类转换是通过显式将整数或浮点值与零进行比较，或者通过将对象引用显式与 null 进行比较来完成的.

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.

如果我们更深入一层，看看在通用中间语言 (CIL) 中是如何指定相应类型的，我们将看到 CLI 布尔类型在内存中占用 1 个字节.Common Language Infrastructure (CLI) 规范在第 III 部分第 1.1.2 节中说:

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:

CLI 布尔类型在内存中占用 1 个字节.全为零的位模式表示值为假.一点点设置了任何一个或多个位的模式(类似于非零整数)表示值为真.

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.

但是，这是在另一个级别上指定的，并且在 C# 中您不必关心；即使 CLI 规范的未来版本可能会更改布尔类型的表示，或者如果 C# 编译器决定将 C# 中的 bool 映射到不同的东西，您的 C# 代码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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