What is the difference between const and non-const in C++?

What is the difference between const and non-const in C++?

In C++, 'const' is a keyword that makes a variable immutable, meaning its value cannot be changed after initialization. Non-const variables can be modified.

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

Sure! Here's an example:

void printValue(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 read-only variable.

Are there any performance benefits to using const?

Yes, using 'const' can help the compiler optimize the code better, as it knows that the value won't change, potentially leading to improved performance.