78IV datasheet(38/523 Pages) NEC

38 / 523 page

CHAPTER 2 CONSTRUCTS OF C LANGUAGE

User’s Manual U15556EJ1V0UM

extern _ _ boolean data1, data2;

data1, data2.......................................................... File scope

void testb(int x);

x ...................................................... Function prtotype scope

void main(void)

{

int cot ;

cot ...................................................................... Block scope

data1 = 1 ;

data2 = 0 ;

while(data1) {

data1 = data2;

j1 :

j1 ................................................................... Function scope

testb (cot) ;

}

void testb(int x)

x ......................................................................... Block scope

{

(1) Function scope

Function scope refers to the entirety within a function. An identifier with function scope can be referenced from

anywhere within a specified function.

Identifiers that have function scope are label names only.

(2) File scope

File scope refers to the entirety of a translation (compiling) unit. Identifiers that are declared outside a block or

parameter list all have file scope. An identifier that has file scope can be referenced from anywhere within the

program.

(3) Block scope

Block scope refers to the range of a block (a sequence of declarations and statements enclosed by a pair of

curly braces { } which begins with the opening brace and ends with the closing brace).

Identifiers that are declared inside a block or parameter list all have block scope. An identifier that has block

scope is effective until the innermost brace pair including the declaration of the identifier is closed.

(4) Function prototype scope

Function prototype scope refers to the range of a declared function from beginning to end. Identifiers that are

declared inside a parameter list within a function prototype all have function prototype scope. An identifier that

has function prototype scope is effective within a specified function.

78IV Datasheet(PDF) 38 Page - NEC