C语言 如何在 C 中使用布尔数据类型？
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How to use boolean datatype in C?
提问by itsaboutcode
I was just writing code in C and it turns out it doesn't have a boolean/bool datatype. Is there any C library which I can include to give me the ability to return a boolean/bool datatype?
我只是用 C 编写代码，结果发现它没有 boolean/bool 数据类型。有没有我可以包含的 C 库来让我能够返回布尔/布尔数据类型？
回答by James McNellis
If you have a compiler that supports C99 you can
如果你有一个支持 C99 的编译器，你可以
#include <stdbool.h>
Otherwise, you can define your own if you'd like. Depending on how you want to use it (and whether you want to be able to compile your code as C++), your implementation could be as simple as:
否则，您可以根据需要定义自己的。根据您希望如何使用它（以及您是否希望能够将代码编译为 C++），您的实现可能非常简单：
#define bool int
#define true 1
#define false 0
In my opinion, though, you may as well just use intand use zero to mean false and nonzero to mean true. That's how it's usually done in C.
不过，在我看来，您也可以int使用零来表示假，使用非零来表示真。这就是通常在 C 中完成的方式。
回答by caveman
C99 has a boolean datatype, actually, but if you must use older versions, just define a type:
C99 实际上有一个布尔数据类型，但如果你必须使用旧版本，只需定义一个类型：
typedef enum {false=0, true=1} bool;
回答by kavya
C99 has a booltype. To use it,
C99 有一个bool类型。要使用它，
#include <stdbool.h>
回答by ysap
As an alternative to James McNellis answer, I always try to use enumeration for the bool type instead of macros: typedef enum bool {false=0; true=1;} bool;. It is safer b/c it lets the compiler do type checking and eliminates macro expansion races
作为 James McNellis 答案的替代方案，我总是尝试对 bool 类型使用枚举而不是宏：typedef enum bool {false=0; true=1;} bool;。b/c 更安全，它让编译器进行类型检查并消除宏扩展竞争
回答by alk
C99 introduced _Boolas intrinsic pure boolean type. No #includes needed:
C99_Bool作为内部纯布尔类型引入。不需要#include：
int main(void)
{
_Bool b = 1;
b = 0;
}
On a true C99 (or higher) compliant C compiler the above code should compile perfectly fine.
在真正符合 C99（或更高版本）的 C 编译器上，上述代码应该可以完美编译。
回答by Sri Charan
We can use enum type for this.We don't require a library. For example
我们可以为此使用枚举类型。我们不需要库。例如
enum {false,true};
the value for falsewill be 0 and the value for truewill be 1.
for 的值为false0，for 的值为true1。
回答by M.zar
struct Bool {
int true;
int false;
}
int main() {
/* bool is a variable of data type – bool*/
struct Bool bool;
/*below I'm accessing struct members through variable –bool*/
bool = {1,0};
print("Student Name is: %s", bool.true);
return 0;
}
