A formula that defines the computation of a value.

Syntax:

expression operator expression | operator expression

expression = name | number | character | string | function_call | 
    physical_literal | aggregate | new | qualified_expression

Description:

Expressions define the way in which values are computed. They consist of operands and operators. Each operand has a value and a type and the type of the result of the expression depends on the types of operands and the operation. The order in which the operations are performed depends on the priorities of the operators in the language (see Operator).

Operators are evaluated in the following order:
1^st:  ** abs not
2^nd:  * / mod rem
3^rd:  + - &
4^th:  sll srl sla sra rol ror
5^th: =  /=  <  <=  >  >=
6^th: and or xor nand nor xnor

Example:

C := A nand B ; 
A := '1' and (B and (C or D)); 
B := a * (abs b) + 10 <= 128;

Notes:

• Operators are defined for particular types of operands and this must be reflected in each expression.
• Different operators can be mixed in one expression as long as the operands are of correct (for each individual operator) type.

See Also:

Aggregate, Name, Operator