Introduction to Variables

Variables

Suppose we have cabinets of different types. In each cabinet, we can only put one item. To store something in a cabinet, first, we’ll decide the cabinet type. Then, we’ll put a unique label on a cabinet to keep track of the item it contains.

A variable is just like a cabinet that can store data. To store something in a variable, we decide its data type (similar to a cabinet type) and give it a unique name (analogous to a label in the above diagram). Each variable can store exactly one item, but the data stored in a variable can be changed over time.

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In terms of programming language, a variable is a location in the computer's memory where we can store data. The value of this data can be changed during the execution of a program. Each variable has a unique and meaningful name which is known as an identifier.

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📝 Note: A big advantage of variables is that they allow us to store data so that we can use it later in the program. We can always change the value of a variable during the running program.

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Let’s move on to the next lesson where you will see the basic syntax for declaring and initializing variables in C++.