How is the bool function used in the C programming lang…

In the C language, the bool type is a boolean type with only two possible values: true and false. However, the bool type is not directly defined in the C standard library; instead, macros are used to represent boolean types.

在stdbool.h头文件中，有一个布尔类型的宏定义：

#define bool _Bool
#define true 1
#define false 0

Therefore, the bool type can be used to represent boolean values.

A bool function is a function that returns a bool type. It is used to perform a logical check and returns either true or false. The definition of a bool function is the same as a regular function, with the only difference being the return type is bool.

Here is an example of a bool function:

#include <stdbool.h>

bool isEven(int num) {
    if(num % 2 == 0) {
        return true;  // 返回true表示num是偶数
    } else {
        return false; // 返回false表示num是奇数
    }
}

int main() {
    int num = 5;
    bool result = isEven(num);
    
    if(result) {
        printf("%d是偶数\n", num);
    } else {
        printf("%d是奇数\n", num);
    }
    
    return 0;
}

In the code above, the isEven function is used to determine whether an integer is even or not. If it is even, the function returns true; otherwise, it returns false. In the main function, the isEven function is called to check the parity of the ‘num’ and print different results based on the return value.

Please note that the bool type is not natively supported in C language and is implemented through macro definitions. Therefore, before using the bool type, the stdbool.h header file needs to be included.