How do I use const in C++ functions?

How do I use const in C++ functions?

In C++, you can use the const keyword to indicate that a function parameter should not be modified. For example, if you have a function that takes a string as a parameter, you can declare it as const std::string& to prevent changes.

Can you give me an example of that?

Sure! Here's a simple example:

void printMessage(const std::string& message) {
    std::cout << message << std::endl;
}

In this function, message cannot be altered inside printMessage.

What happens if I try to modify a const parameter?

If you try to modify a const parameter, the compiler will throw an error, preventing you from changing its value.

Are there other uses for const in C++?

Yes, const can also be used with member functions to indicate that they do not modify the object, and with pointers to indicate that the data being pointed to cannot be changed.