Holtek HT-IDE, User Manual, Page: 99 / 258

The memory location must be in the general purpose data memory. The
offset of it starts from 0
×
20.
All variables implemented by the Holtek C compiler are static unless they
are declared as external variables. Note that both static and external
variables will not be initialized to zero by default.
Constants
A constant is any literal number, single character or character string.
Integer constants
An integer constant is evaluated as int type, a long constant is terminated
with l or L. Unsigned constants are terminated with a u or U, the suffix ul
or UL indicates unsigned long. The value of an integer constant can be
specified with the following forms:
Binary constant: preceding the number by 0b or 0B
Octal constant: preceding the number by 0 (zero)
Hexadecimal constant: preceding the number by 0x or 0X
Others not included above are decimal
Character constants
A character constant is an integer, which is denoted by a single character
enclosed by single quotes. The value of a character constant is the numeric
value of the character in the machine’s character set. ANSI C escape
sequences are treated as a single character constant.
String constants
String constants are represented by zero or more characters (including the
ANSI C escape sequences) enclosed in double quotes. A string constant is
an array of characters and has an implied null (zero) value after the last
character. Hence, the total required storage is one more than the number
of the characters within the double quotes.
Enumeration constants
Another method for naming integer constants is called enumeration. For
example:
enum {PORTA, PORTB, PORTC} ;
Chapter 9 Holtek C Language
89