How do I use const pointers in C++?

How do I use const pointers in C++?

In C++, a const pointer is a pointer that cannot change the address it points to after initialization. You declare it like this: int* const ptr = &value;.

What happens if I try to change the pointer to point to another variable?

If you try to change the pointer to point to another variable, you'll get a compilation error because the pointer is declared as const.

Can I change the value of the variable that the const pointer points to?

Yes, you can change the value of the variable that the const pointer points to. The const only applies to the pointer itself, not the data it points to.

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

Sure! Here's an example:

void displayValue(const int* const ptr) {
    std::cout << *ptr;
}

In this function, ptr is a const pointer to a const int.