按位运算|和|在C#中哪种情况是对还是错 [英] Bitwise operations | And | Which situation is true or false in c#

问题描述

我通过一个例子来展示我的问题:

I show my question by an example :

    int a = 1 << 0; // = 1
    int flag = 1;
    bool b = flag & a; // = 1 < In c++ this line has no error but in c# error is like this :

不能应用于类型为'bool'和'int'的操作数

Cannot be applied to operands of type 'bool' and 'int'

1. 在C#中，何时 b 变量为 true ，而 b 变量为 false ?

如何解决该错误?

c ++何时识别出 b 变量为true?另一边应该是(flag& a)！= 0 或(flag& a)== 1 或其他名称?

When does c++ recognize that b variable is true? The other side should be (flag & a) != 0 or (flag & a) == 1 or something else?

推荐答案

在C#中，您将其编写为:

In C# you write it like so:

bool b = (flag & a) != 0;

在C#中，您不能像在C ++中那样将int分配给bool.

You can't assign an int to a bool in C#, like you can in C++.

(在C ++中，编译器生成的代码实际上与上述代码具有相同的功能，尽管如果您仅尝试将int分配给bool，大多数C ++编译器都会生成警告.)

(In C++ the compiler generates code that effectively does the same as the code above, although most C++ compilers will generate a warning if you just try to assign an int to a bool.)

也请参阅Visual C ++警告C4800 ，它告诉您也用C ++编写这种方式.

Also see the Visual C++ warning C4800, which tells you to write it this way in C++ too.

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