Mathematical operators

Description

JB mathematical operators list:

Operator		Meaning
^		Power (Exponentiation)
*		Multiplication
/		Division
MOD		Modulus (Remainder of a Division)
+		Addition
-		Subtraction

Syntax

numerical_expression operator numerical_expression

Result is a numerical expression.

Hints

If there are several operators in an expression, they are evaluated by rules of precedence

first: ^
second: * / mod
third: + -

within the same precedence - from left to right.

Just Basic supports operations on arbitrary-length integers, see Numbers. When working with integers, all operations except division return an integer (possibly long integer). There is no special integer division, if a and b are integers, and a/b happens to return an integer, you get an (may be long) integer, otherwise you get a Double (a floating point value with 16 significant digits and a maximum range of about +/- 1e307).

But if you take INT(a/b) where a is a long integer and b is a (possibly long) integer, then you can get a long integer. It is probably due to JB not storing intermediate results as floating point until it has to.

Exponentiation operator (^, a^b reads as "a to the power of b") is defined in mathematics so that, if a>0, then b could be any number; but if a<0, then b must be an integer.

The MOD operator could be described as

a MOD b = a - INT(a/b)*b

"all we get when we subtract b from a till the remaining number is less than b"

Note that in JB for negative a the result of a MOD b is negative.

The MOD operator is very handy for wrapping indexes around, just remember that a MOD b for integers a and b produces numbers from 0 to b-1.

Wrapping things around is nicely illustrated by the day of week concept (see the DATE$() function).

Example

' Place a simple, working example of the keyword here

Useful Procedures

' Place a useful function or sub using this keyword here