Nested Structures

C allows you to create more complex and hierarchical data models by nesting structures, which means defining a structure that has another structure as one of its members. This is a natural way to represent 'has-a' relationships in your data. For example, an `Employee` might have a `name` and a `hireDate`. The `hireDate` itself can be a structure consisting of a day, month, and year. Instead of having separate `hireDay`, `hireMonth`, and `hireYear` members in the `Employee` structure, it's much cleaner to group them into a `Date` structure and then include a `Date` structure variable inside the `Employee` structure. To define a nested structure, you simply declare a variable of one structure type inside the definition of another. For example: `struct Date { int day; int month; int year; };` and `struct Employee { char name[50]; struct Date joinDate; };`. To access the members of the inner structure, you chain the dot operators. If you have an `Employee` variable named `emp1`, you would access the year of their joining date with `emp1.joinDate.year`. This nesting can be extended to multiple levels, allowing you to build intricate data representations that closely mirror real-world objects. This approach significantly improves code organization and readability by grouping related data logically, making your data structures more intuitive and easier to manage.