Holtek HT-IDE, User Manual

Page: 97 / 258

→
Line comment
A line comment begins with // and comments out all characters to the end
of the line, for example
// this is a line comment
Identifiers
The name of an identifier contains a sequence of letters, digits, and under
scores with the following rules:
The first character must not be a digit
•
Only the first 31 characters are significant
•
Upper case and lower case letters are different
•
Reserved words cannot be used
Reserved words
The following are the reserved words supported by the Holtek C complier.
They must be in lower case.
auto bits break case char
const continue default do else
enum extern for goto if
int long return short signed
static struct switch typedef union
unsigned void volatile while
The reserved words double, float, register and sizeof are not supported
by the Holtek C compiler.
Data types and sizes
Only three basic data types are supported by the Holtek C compiler,
char a single byte holding one character
int an integer occupying one byte
void an empty set of values, used as the type returned by functions that
generate no value
The following qualifiers are allowed
Qualifier Applicable Data Type Use
const
any
place the data in a ROM space
long
int
create a 16-bit integer
short
int
create an 8-bit integer
signed
char, int
create a signed variable
unsigned
char, int
create an unsigned variable
Chapter 9 Holtek C Language
87