78IV datasheet(45/523 Pages) NEC

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CHAPTER 2 CONSTRUCTS OF C LANGUAGE

User’s Manual U15556EJ1V0UM

(3) Incomplete types

The incomplete data types include the following four types.

•

Arrays with indefinite object size

•

Structures

•

Unions

•

void type

(4) Derived types

The derived types are divided into the following three categories.

•

Array type

•

Structure type

•

Union type

•

Function type

•

Pointer type

(a) Aggregate type

The aggregate type is subdivided into two types.

Array type and Structure type.

An aggregate type data is a collection of member objects to be taken

successively.

Array type

The array type continuously allocates a collection of member objects called element types. Member

objects all have an area of the same size. The array type specifies the number of element types and the

elements of the array. It cannot create an incomplete type array.

ii)

Structure type

The structure type continuously allocates member objects each differing in size. Each member object

can be specified by name.

(b) Union type

The union type is a collection of member objects that overlap each other in memory. These member objects

differ in size and name and can be specified individually.

The function type represents a function that has a specified return value. Function type data specifies the

type of return value, the number of parameters, and the type of parameter. If the type of return value is T,

the function is referred to as a function that returns T.

(d) Pointer type

The pointer type is created from a function type object type called a referenced type as well as from an

incomplete type.

The pointer type represents an object.

The value indicated by the object is used to

reference the entity of a referenced type.

A pointer type data created from the referenced type T is called a pointer to T.

(5) Scalar types

The basic types (arithmetic types) and pointer type are collectively called the scalar types. The scalar types

include the following data types.

•

char type

•

Signed integral type

•

Unsigned integral type

•

Enumeration type

•

Floating point type

•

Pointer type

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