Learn: Variables vs Constants

Welcome!I've looked at your growth areas and created this lesson to help strengthen your understanding of variables and constants. Let's explore their differences and uses in programming!

What are Variables and Constants?Both variables and constants are used to store data in programming. A variable stores data that can change during the program's execution, while a constant stores data that stays the same throughout the program.

VariablesA variable is a named storage space in memory that holds data. The value stored in a variable can be changed during the program's execution. For example, a variable might store a user's score in a game.

ConstantsA constant is a named storage space in memory that holds a fixed value. Its value cannot be changed while the program is running. For example, a constant might store the number of hours in a day (24).

Why Use Variables and Constants?Variables are useful for storing data that changes, like a user's input or game scores. Constants are useful for storing values that never change, like mathematical constants (e.g., pi) or fixed settings in a program.

Types of Data StoredBoth variables and constants can store different types of data. Common types include integer (whole numbers), real/float (decimal numbers), Boolean (true/false), character (single letters), and string (text).

Examples Using Variables and ConstantsConsider a simple program that calculates the area of a rectangle. The length and width could be variables because they might change depending on user input. The formula to calculate the area (length × width) could use a constant for a fixed multiplier.

Review Time!Great work! You've learned about variables and constants, their differences, and how to use them in programming. Let's test your understanding with a few questions.