How do you use bool in C++?

In C++, bool is a Boolean data type used to represent true or false values. One can use bool in the following way:

1. Declare and initialize a boolean variable.

bool isTrue = true;
bool isFalse = false;

1. Compare expressions using relational operators.

bool result = (5 > 3);   // result的值为true
bool result2 = (10 == 10);  // result2的值为true
bool result3 = (7 < 4);   // result3的值为false

1. Perform logical operations on boolean values using logical operators.

bool a = true;
bool b = false;
bool result = (a && b);   // result的值为false (逻辑与)
bool result2 = (a || b);  // result2的值为true (逻辑或)
bool result3 = !a;   // result3的值为false (逻辑非)

1. Using bool as the condition in a conditional statement.

bool isTrue = true;
if (isTrue) {
    // 在条件为真时执行的代码
} else {
    // 在条件为假时执行的代码
}

1. Using bool as the return type of a function:

bool isEven(int num) {
    if (num % 2 == 0) {
        return true;
    } else {
        return false;
    }
}

Here are some common examples of how to use bool, which can be tailored to fit specific use cases.