How to use bool function in c++

The bool function in C returns true or false and is used to determine whether an expression is true. Its parameter is the expression to be evaluated. This function is often used to convert conditional expressions into bool values. Please note that it only handles boolean expressions, and different types of values ​​will be considered true or false.

The bool function in C

The bool function is a built-in function used to determine whether an expression is true. . It returns a bool value, either true or false.

Definition:

<code class="cpp">bool bool(expression);</code>

Parameters:

• expression: The expression to evaluate Mode.

Return value:

• If expression is true, return true; otherwise, return false.

Usage:

The bool function can be used to convert a conditional expression into a bool value. For example:

<code class="cpp">if (bool(x > 0)) {
  // x 为正数时执行代码
} else {
  // x 不是正数时执行代码
}</code>

Note:

• The bool function can only handle Boolean expressions (expressions that produce true or false values). The
• bool function does not perform type conversion on the value of expression.
• If the value of expression is 0 or the empty string (""), it is considered false; otherwise it is considered true.

Example:

<code class="cpp">// 检查数字是否为正数
bool isPositive(int x) {
  return bool(x > 0);
}

// 检查字符串是否为空
bool isEmpty(string s) {
  return bool(s.empty());
}</code>

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