78IV datasheet(37/523 Pages) NEC

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CHAPTER 2 CONSTRUCTS OF C LANGUAGE

User’s Manual U15556EJ1V0UM

2.3 Identifiers

An identifier is the name given to the following variables.

Function

Object

Tag of structure, union, or enumeration type

Member of structure, union, or enumeration type

typedef name

Label name

Macro name

Macro parameter

Each identifier can consist of uppercase letters, lowercase letters, or numeric characters including underscores.

The following characters can be used as identifiers.

There is no restriction on the maximum length of the identifier.

In this compiler, however, only the first 249

characters can be identified (refer to Table 1-1 Maximum Performance Characteristics of This C Compiler).

(underscore)

a b c d e f g h i j k l m

n o p q r s t u v w x y z

A B C D E F G H I J K L M

N O P Q R S T U V W X Y Z

0 1 2 3 4 5 6 7 8 9

All identifiers must begin with other than a numerical character (namely, a letter or an underscore) and must not

be the same as any keyword.

2.3.1 Scope of identifiers

The range of an identifier within which its use becomes effective is determined by the location at which the

identifier is declared. The scope of identifiers is divided into the following four types.

Function scope

File scope

Block scope

Function prototype scope

78IV Datasheet(PDF) 37 Page - NEC