What is the purpose of a bool function in the C languag…

The purpose of the bool function in C language is to return a boolean value (true or false). It is typically used to determine if a certain condition is met and choose the program’s execution path based on the result.

In C language, there is no built-in bool type, so int type is often used to represent boolean values, where 0 represents false and non-zero values represent true. To enhance code readability, one can use a bool function to return true or false, making the code clearer and easier to understand.

Bool functions are commonly used in conditional statements, such as if statements or while loops, to execute specific code blocks based on the truth or falsity of a condition. They can simplify code logic, improve code readability, and maintainability.

Here is an example using a bool function.

#include <stdbool.h> // 包含bool函数的头文件

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

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

In the above example, the isEven function is used to determine if a number is even. If it is even, it returns true, otherwise it returns false. In the main function, based on the return value of the isEven function, the corresponding result is printed.

Using the bool function can enhance the readability and maintainability of the code by clearly expressing the true or false conditions, while avoiding the confusion that can arise from using 0 and non-zero values to represent boolean values.