Final answer:
A user-defined type allows programmers to create custom data types. The scope of a variable determines its visibility in a program. An array can have multiple dimensions.
Step-by-step explanation:
A user-defined type in programming allows programmers to create custom data types. These data types can be used to organize and store different kinds of information. For example, a programmer can create a user-defined type called 'Car' that has properties like 'color', 'make', and 'model'.
This allows the programmer to easily create and manipulate objects that represent cars.
The scope of a variable refers to its visibility or accessibility within a program. When a variable is declared, it can have a global scope, meaning it can be accessed from anywhere in the program, or a local scope, meaning it can only be accessed within a specific region of the program or within a declared function.
An array in programming is a data structure that can store multiple values of the same type. It can have more than one dimension, which means it can have multiple rows and columns.
This allows for the organization and storage of large amounts of data in a structured manner.