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4.5 Expressions Used in Program Instructions
Current Definition for Expression:
All positions behind the address characters that are taken up by numbers can be replaced by
assignment expressions.
No characters of space type are allowed to exist in the expression, including Space, Tab and
Enter, etc. What’s more, an expression must be ended with a valid separator.
Definition for Assignment Expression:
An assignment expression begins with an equal mark, followed by an arithmetic expression
which is constituted by various operators, functions, variables, brackets, etc.
The operators available now are divided into the following seven classes in order of priority:
1. Bracket
2. Function
3. Plus sign +, Minus sign -, NOT !
4. Multiplication *, Division /
5. Addition +, Subtraction –
6. Equal ==, Not equal !=, Greater than >, Less than <
7. OR ||, AND &&
Following are the mathematical functions available now:
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