Expressions are formulas for computing new values from a collection of
operators and their operands. Operator precedence, in combination with the
use of parentheses, determines the order of expression evaluation. When two
or more operators of the same precedence occur at the same level of evaluation,
they are evaluated from left to right.
Expression operands may be literals, variables, functions, macros, and
symbolic procedure names, each of which denotes a value of some type.
Examples of valid expressions are:
- $12
Simple numeric literal
- pc + 4
Predefined variable
- FOPEN + 12
Symbolic procedure name
- [dst 2.104]
Indirection - contents of DST 2.104
- (count < 5) and (q>200)
Boolean expression with relational operators
- strup('hello') + "MOM"
Standard function result
