Expressions, Arithmetic operators – Zilog EZ80F916 User Manual
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192
Character Strings
Character strings consist of printable ASCII characters enclosed by double (
"
) or single
(
'
) quotes. A double quote used within a string delimited by double quotes and a single
quote used within a string delimited by single quotes must be preceded by a back slash (
\
).
A single quoted string consisting of a single character is treated as a character constant.
The assembler does not insert null character (0's) at the end of a text string automatically
unless a 0 is inserted, and a character string cannot be used as an operand. For example:
DB "STRING" ; a string
DB 'STRING',0 ; C printable string
DB "STRING\"S" ; embedded quote
DB 'a','b','c' ; character constants
EXPRESSIONS
In most cases, where a single integer or float value can be used as an operand, an expres-
sion can also be used. The assembler evaluates expressions in 32-bit signed arithmetic or
64-bit floating-point arithmetic. Logical expressions are bitwise operators.
The assembler detects overflow and division by zero errors in constant expressions. The
following sections describe the syntax of writing an expression:
•
“Arithmetic Operators” on page 192
•
“Relational Operators” on page 193
•
“Boolean Operators” on page 193
•
“HIGH and LOW Operators” on page 193
•
“HIGH16 and LOW16 Operators” on page 194
•
•
“Hexadecimal Numbers” on page 194
•
•
•
“Character Constants” on page 195
•
“Operator Precedence” on page 195
Arithmetic Operators
<<
Left Shift
>>
Arithmetic Right Shift
**
Exponentiation
*
Multiplication