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Bernd Böckmann
2022-10-15 22:10:21 +02:00
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@@ -56,14 +56,14 @@ Variables may be of type byte or word, depending on the data type of the express
## Expressions
There are many places where expressions may occur, for example on the right side of a variable definition or as an argument to a machine instruction. The most primitive form of an expression is a numeric constant, which can be given in decimal, hexadecimal or binary. The value of the constant determines its type. A small value can be forced to be of type word by prepending zeros.
5 ; decimal byte constant
$a ; decimal byte constant
5 ; decimal byte constant
$a ; decimal byte constant
$4711 ; hex word constant
%1011 ; binary byte constant
$00a ; hex word constant because more than 2 digits
0123 ; decimal word constant because more than 3 digits
-1 ; word constant $FFFF (2-complement)
'x' ; byte typed ascii charactar code of x
-1 ; word constant $FFFF (2-complement)
Arithmetic operations may be used in expressions. Operator precedence is respected, as in the following example:
@@ -73,8 +73,8 @@ Arithmetic operations may be used in expressions. Operator precedence is respect
The supported operations are the following:
- lowest precedence: unary byte select: low byte (<) and high byte (>)
- unary and binary addition (+) and subtraction(-), bitwise or (|)
- multiplication (*), bitwise and(&)
- unary and binary addition (+) and subtraction(-), bitwise or (|), exclusive or (^)
- multiplication (*), division (/), bitwise and(&)
- highest precedence: expressions enclosed by parentheses
Examples: