When should I use variables instead of constants?

When should I use variables instead of constants?

You should use variables when the value can change during program execution, while constants are for fixed values.

Can you give me an example of when to use each?

Sure! Use a variable for user input like a score, and a constant for a fixed value like the number of days in a week.

What happens if I try to change a constant?

If you try to change a constant, it will usually result in an error, as constants are meant to remain unchanged.

Are there any performance differences between using variables and constants?

Generally, constants can be optimized better by compilers, but the difference is often negligible in most applications.