Each operator has a specific priority, for
example multiplications take
precedence over additions.
Expressions are evaluated from left to right.
The dollar sign '$' must be placed at the
end of an expression to indicate that the the expression
must be evaluated in a string context.
Not like: if a$ = "hello" and b$ = "world"
but like: if a = "hello" and b = "world"$
If you need both contexts in the same expression,
the way to do it is to use parentheses:
if (a = "hello"$) and c = 7
Priority
1 = done first,
8 = done last |
Operator |
Use |
| 1 |
^ |
Exponent.
p = 2 ^ 3, p contains 8 |
|
| 2 |
* |
Multiplication.
m = 4 * 3, m contains 12 |
| 2 |
/ |
Division.
d = 10 / 3, d contains 3.3333 |
| 2 |
% |
Modulo, that is the remainder of a division of an integer by another integer.
If you use floating point values, they will first be transformed into integers.
m = 10 % 3, m contains 1
|
|
| 3 |
+ |
Addition
a = 10 + 4, a contains 14 |
| 3 |
- |
Substraction.
s = 5 - 3, s contains 2 |
|
| 4 |
& |
Binary and.
b = 3 & 2, b contains 2 |
| 4 |
| |
Binary or.
o= 5 | 3, o contains 7 |
|
| 6 |
< |
'Less than'.
l = 5 < 3, l contains 0
l = 1 < 2, l contains 1
This operator is mainly used in tests, like in: 'if a < b'
|
| 6 |
> |
'Greater than'.
g = 5 > 3, g contains 1
g = 1 > 2, g contains 0
This operator is mainly used in tests, like in: 'if a > b'
|
| 6 |
<= |
'Less than or equal to'.
s = 5 <= 3, s contains 0
s = 1 <= 2, s contains 1
This operator is mainly used in tests, like in:
'if a <= b'
|
| 6 |
>= |
'Greater than or equal to'.
b = 5 > = 3, b contains 1
b = 1 > = 2, e contains 0
This operator is mainly used in tests, like in:
'if a >= b'
|
|
| 7 |
!=
Or
<> |
Different of.
d = 1 != 2, d contains 1
d = 1 != 1, d contains 0
This operator is mainly used in tests, like in: 'if a != b'
|
| 7 |
= |
Equality.
This operator, which is the same as the assignment one, is mainly used in tests,
like in: 'if a = b'
|
|
| 8 |
and |
logical and.
Gives 1 if the two operands are not 0.
A = 5 and 2, A contains 1
A = 5 and 0, A contains 0
This operator is mainly used in tests, 'if a > 2 and a < 10' meaning
'if a is between 2 and 10 excluded'
|
| 8 |
or |
logical or. Gives 1 if either one the two operands is not 0.
R = 5 and 3, R contains 1
R = 5 and 0, R contains 1
R = 0 and 0, R contains 0
This operator is mainly used in tests like in: 'if a < 2 or b < 2'.
|
Priority
3 = done first,
8 = done last |
Operator |
Use |
| 3 |
+ |
Concatenation
a = "hello" $
b = "world" $
c = a + " " + b $, c$ contains "hello world" |
|
| 6 |
< |
'Less than'.
Comparison on the length of the strings |
| 6 |
> |
'Greater than'.
Comparison on the length of the strings |
| 6 |
<= |
'Less than or equal to'.
Comparison on the length of the strings |
| 6 |
>= |
'Greater than or equal to'.
Comparison on the length of the strings |
|
| 7 |
!=
Or
<> |
Different of.
This operator compares the two strings letter by
letter and is case-sensitive. |
| 7 |
= |
Equality.
This operator compares the two strings letter by
letter and is case-sensitive. |
|
| 8 |
and |
logical and.
"1" is returned if both strings are not empty.
|
| 8 |
or |
logical or.
"1" is returned if either one of the two string is not empty. |
