What is the const keyword in C++?

What is the const keyword in C++?

The const keyword in C++ is used to define constants, which are variables whose values cannot be changed after initialization.

Can you give me an example of using const in a function?

Sure! Here's an example:

void display(const int value) {
    std::cout << value;
}

In this function, 'value' cannot be modified inside the function.

What happens if I try to change a const variable?

If you try to change a const variable, the compiler will throw an error, indicating that you cannot modify a constant.

Are there any best practices for using const?

Yes, it's best to use const for function parameters when you don't need to modify them, and for class member functions that don't change the object's state.