4.1.2. Operators¶
4.1.2.1. Associativity¶
Right-to-left means the value on the right is evaluated first
Left-to-right means the value on the left is evaluated first
4.1.2.2. Order of Precedence¶
The order of precedence for operators:
Bracket
Arithmetic
Relational
Logical
Assignment
4.1.2.2.1. Bracket Operators¶
Operator |
Meaning |
|---|---|
(
|
Left bracket |
)
|
Right bracket |
4.1.2.2.2. Arithmetic Operators¶
All operators here are binary (require two numbers):
Only + and - are both binary and unary operators.
Precedence |
Operator |
Meaning |
Associativity |
|---|---|---|---|
1 |
**
|
Exponentiation |
Right-to-left |
=2 |
*
|
Muliplication |
Left-to-right |
=2 |
/
|
Division |
Left-to-right |
=3 |
+
|
Addition |
Left-to-right |
=3 |
-
|
Subtraction |
Left-to-right |
4.1.2.2.3. Relational Operators¶
All are binary. As well as numbers, you can also compare strings, e.g. "string_1" .ne. "string_2" or "string_1" .eq. "string_2"
Precedence |
Operator 1 |
Operator 2 |
Meaning |
Associativity |
|---|---|---|---|---|
=1 |
.lt.
|
<
|
Less Than |
None |
=1 |
.le.
|
<=
|
Less Than or Equal To |
None |
=1 |
.eq.
|
==
|
Equal To |
None |
=1 |
.ne.
|
/=
|
Not Equal To |
None |
=1 |
.gt.
|
>
|
Greater Than |
None |
=1 |
.ge.
|
>=
|
Greater Than or Equal To |
None |
4.1.2.2.4. Logical Operators¶
Logical Not is unary, the rest are binary:
Precedence |
Operator |
Meaning |
Associativity |
|---|---|---|---|
1 |
.not.
|
Unary Logical Not |
Right-to-left |
2 |
.and.
|
Binary Logical And |
Left-to-right |
3 |
.or.
|
Binary Logical Or |
Left-to-right |
=4 |
.eqv.
|
Binary Logical Equivalence |
Left-to-right |
=4 |
.neqv.
|
Binary Logical Not Equivalence |
Left-to-right |
4.1.2.2.5. Assignment Operators¶
Assignment operator is binary:
Operator |
Meaning |
Associativity |
|---|---|---|
=
|
Assignment |
Right-to-left |
4.1.2.3. Concatenation, Continuation and Comments¶
Operation |
Meaning |
|---|---|
"text_1" // "text_2"
|
String concatenation |
A = 175.5 * Year &
+ Count / 100
|
Ampersand (&) is a continuation line |
! Text
|
Exclamation Mark (!) is a comment |