| REBOL 3 Docs | Guide | Concepts | Functions | Datatypes | Errors |
| TOC < Back Next > | Updated: 6-Feb-2009 Edit History |
The mathematical functions of REBOL operate in a consistent manner over a wide range of scalar (numerical) datatypes. These datatypes include:
| Datatype | Description |
|---|---|
| 'Integer! | 32 bit numbers without decimal point |
| 'Decimal! | 64 bit floating point numbers |
| 'Money! | currency with 64 bit floating point number |
| 'Time! | hours, minutes, seconds, and sub-seconds |
| 'Date! | day, month, year, time, time zone |
| 'Pair! | graphical position or size |
| 'Tuple! | versions, colors, network addresses |
The following are a few examples that show a range of math operations over the scalar datatypes. Notice that operators produce useful results for each datatype.
The integer! and decimal! datatypes:
print 2 + 1
3
print 2 - 1
1
print 2 * 10
20
print 20 / 10
2
print 21 // 10
1
print 2.2 + 1
3.2
print 2.2 - 1
1.2
print 2.2 * 10
22
print 2.2 / 10
0.22
print random 10
5
The time! datatype:
print 2:20 + 1:40
4:00
print 2:20 + 5
2:20:05
print 2:20 + 60
2:21
print 2:20 + 2.2
2:20:02.2
print 2:20 - 1:20
1:00
print 2:20 - 5
2:19:55
print 2:20 - 120
2:18
print 2:20 * 2
4:40
print 2:20 / 2
1:10
print 2:20:01 / 2
1:10:00.5
print 2:21 // 2
0:00
print - 2:20
-2:20
print random 10:00
5:30:52
The date! datatype:
print 1-Jan-2000 + 1
2-Jan-2000
print 1-Jan-2000 - 1
31-Dec-1999
print 1-Jan-2000 + 31
1-Feb-2000
print 1-Jan-2000 + 366
1-Jan-2001
birthday: 7-Dec-1944
print ["I've lived" (now/date - birthday) "days."]
I've lived 20305 days.
print random 1-1-2000
29-Apr-1695
The money! datatype:
print $2.20 + $1
$3.20
print $2.20 + 1
$3.20
print $2.20 + 1.1
$3.30
print $2.20 - $1
$1.20
print $2.20 * 3
$6.60
print $2.20 / 2
$1.10
print $2.20 / $1.10
2
print $2.21 // 2
$0.21
print random $10.00
$6.00
The pair! datatype:
print 100x200 + 10x20
110x220
print 10x10 + 3
13x13
print 10x20 * 2x4
20x80
print 100x100 * 3
300x300
print 100x30 / 10x3
10x10
print 100x30 / 10
10x3
print 101x32 // 10x3
1x2
print 101x32 // 10
1x2
print random 100x20
67x12
The tuple! datatype:
print 1.2.3 + 3.2.1
4.4.4
print 1.2.3 - 1.0.1
0.2.2
print 1.2.3 * 3
3.6.9
print 10.20.30 / 10
1.2.3
print 11.22.33 // 10
1.2.3
print 1.2.3 * 1.2.3
1.4.9
print 10.20.30 / 10.20.30
1.1.1
print 1.2.3 + 7
8.9.10
print 1.2.3 - 1
0.1.2
print random 10.20.30
8.18.12
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