| Let’s dive into the depths of constexpr in C++! constexpr is short for "constant expression." It was introduced in C++11 and further enhanced in C++14 and C++20. The primary purpose of constexpr is to allow the evaluation of expressions at compile-time, enabling several powerful optimizations. Here’s a detailed breakdown: Purpose of constexpr The idea behind constexpr is to inform the compiler that the value of a variable or the result of a function can be determined at compile-time. It will be if the expression can be evaluated at compile-time, resulting in performance benefits. It’s beneficial for: - Compile-time constants: Values that don’t change at runtime. - Optimizations: Allowing the compiler to optimize code more effectively. - Template metaprogramming: Enhancing the power of templates. Usage in Variables A constexpr variable must be initialized with a constant expression. Here’s an example: constexpr int length = 10; constexpr int width = 5; conste...