Question

Consider the following struct definition: struct rectangleData { double length; double width; double area; double perimeter; };
Which of the following variable declarations is correct?
a. struct rectangleData(); b. rectangleData myRectangle; c. rectangleData rectangle = new rectangleData(); d. rectangle rectangleData;

Answer 1

After considering the given struct, the following variable declarations is correct:

rectangleData myRectangle;

What is variable declaration?

A declaration is a language construct that specifies identifier properties: it declares the meaning of a word. Declarations are most commonly used to define functions, variables, constants, and classes, but they can also define enumerations and type definitions.

In addition to the name (the identifier) and the type of entity (function, variable), declarations typically specify the data type (for variables and constants) or the type signature (for functions); types may also include dimensions, as in arrays.

A declaration is used in forward declaration to announce the existence of an entity to the compiler; this is important in strongly typed languages that require functions, variables, constants, and their types to be specified with a declaration before use.

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