To help us understand how to include structures (also called structs) in our code, let’s look at how to define them:

In the image above:

• The struct keyword initiates the structure type definition
• Bottle is the name of the new structure type
• A set of curly braces, {}, to enclose the struct member variables
• Inside the braces, the member variables are “packaged” together.

Member variables can be any basic types (int, char, etc). They can also be derived types like arrays, pointers, and even other structures. It’s important to note that the member variables should only be declared and not initialized (we will learn about this later). Attempting to give the member variable values will lead to an error.