Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 197)

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UM017105-0511 Type Sizes

Zilog Developer Studio II – ZNEO™

User Manual

169

Supported New Features from the 1999 Standard

The ZNEO compiler implements four new features introduced in the ANSI 1999 standard,

also known as ISO/IEC 9899:1999; each is described below.

C++ Style Comments

Comments preceded by // and terminated by the end of a line, as in C++, are supported.

Trailing Comma in Enum

A trailing comma in enum declarations is allowed. This essentially allows a common syn-

tactic error that does no harm. Thus, a declaration such as:

enum color {red, green, blue,} col;

is allowed (note the extra comma after blue).

Empty Macro Arguments

Preprocessor macros that take arguments are allowed to be invoked with one or more

arguments empty, as in this example:

#define cat3(a,b,c) a b c

printf("%s\n", cat3("Hello ", ,"World"));

// ^ Empty arg

Long Long Int Type

The long long int type is allowed. (In the ZNEO C-Compiler, this type is treated as

the same as

long, which is allowed by the standard.)

Type Sizes

The type sizes for basic data types on the ZNEO C-Compiler are:

The type sizes for the pointer data types on the ZNEO C-Compiler are:

int 32 bits

short int 16 bits

char 8 bits

long 32 bits

float 32 bits

double 32 bits

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