Learn: Variables vs Constants

Welcome!Today, we're going to explore the difference between variables and constants. These are key concepts in programming that are used to store and manage data. Let's dive in!

What is a Variable?A variable is a named storage location in programming that can hold a value which may change as the program runs. Think of it like a labelled box where you can store something, take it out, and replace it with something else.

What is a Constant?A constant is also a named storage location, but unlike variables, the value stored in a constant cannot be changed once it is set. It's useful for storing values that need to stay the same throughout the program.

Why Use Variables and Constants?Variables are useful for storing data that changes, like a player's score in a game. Constants are important for values that shouldn't change, like the number of days in a week or the value of pi (3.14159).

Examples of Variables and ConstantsIn a program, you might use a variable to store a player's score, which changes as they play. A constant might store the maximum possible score, which doesn't change.

Declaring Variables and ConstantsTo declare a variable, you assign it a name and optionally a starting value. For constants, you use a special keyword or method to ensure the value can't change. Different programming languages handle this slightly differently.

Review Time!Great work! You've learned about variables, constants, their differences, and how they're used. Now let's test your understanding with a few final questions.