We have already briefly touched on the topic of structures. Structures help in defining custom user-defined data structures. Structures help in group multiple variables of different data types into a single type. A structure does not contain any programming logic or code for execution; it just contains a variable declaration. Structures are reference types and are treated as complex type in Solidity.
Structures can be defined as state variables, as shown in the next code illustration. A struct composed of string, uint, bool, and uint arrays is defined. There are two state variables. They are on the storage location. While the first stateStructure1 state variable is initialized at the time of declaration, the other stateStructure1 state variable is left to be initialized later within a function.
A local structure at the memory location is declared and initialized within the getAge function.
Another structure is declared that acts as a pointer to the stateStructure state...