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<!DOCTYPE html
>
<
html
lang
="
en
"
>
<
head
>
<
meta
charset
="
utf-8
"
>
<
meta
http-equiv
="
X-UA-Compatible
"
content
="
IE=edge
"
>
<
meta
name
="
viewport
"
content
="
width=device-width, initial-scale=1
"
>
<
title
>
SmallBASIC | ISNUMBER
</
title
>
<
meta
name
="
description
"
content
="
Returns true if x is a number (or it can be converted to a number).
"
>
<
link
rel
="
canonical
"
href
="
559
"
>
<
link
rel
="
keywords
"
href
="
ISNUMBER (x)
"
>
<
link
rel
="
stylesheet
"
href
="
/css/style.css
"
>
<
link
rel
="
icon
"
type
="
image/png
"
href
="
/images/sb-desktop-32x32.png
"
>
<
script
src
="
/clipboard.js
"
>
</
script
>
</
head
>
<
body
>
<
button
onclick
="
topFunction()
"
id
="
BackToTopBtn
"
title
="
Go to top
"
>
⯅
</
button
>
<
script
src
="
/backtotop.js
"
>
</
script
>
<
div
class
="
wrapAll clearfix
"
>
<
nav
class
="
navigation
"
>
<
div
class
="
logo
"
>
<
a
href
="
/
"
>
<
img
src
='
/images/sb-logo.png?v=2
'
alt
="
logo
"
>
</
a
>
</
div
>
<
div
class
="
navlinks
"
>
<
a
href
="
/pages/download.html
"
>
Download
</
a
>
<
a
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/pages/news.html
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News
</
a
>
<
a
href
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/pages/community.html
"
>
Community
</
a
>
<
a
href
="
/pages/articles.html
"
>
Resources
</
a
>
<
a
class
='
active
'
href
="
/pages/reference.html
"
>
Language Reference
</
a
>
<
a
href
="
/pages/guide.html
"
>
SmallBASIC Manual
</
a
>
</
div
>
</
nav
>
<
div
class
="
mainsection
"
>
<
div
class
="
tabs clearfix
"
>
<
div
class
="
tabsRight
"
>
<
a
target
="
_github
"
href
="
https://github.com/smallbasic/smallbasic.github.io/blob/master/_build/reference/559-data-isnumber.markdown
"
>
Edit
</
a
>
<
a
target
="
_github
"
href
="
https://github.com/smallbasic/smallbasic.github.io/commits/master/_build/reference/559-data-isnumber.markdown
"
>
History
</
a
>
</
div
>
</
div
>
<
div
class
="
article
"
>
<
h1
>
ISNUMBER
</
h1
>
<
blockquote
>
b = ISNUMBER (x)
</
blockquote
>
<
div
class
="
siteSub
"
>
<
p
>
<
a
href
="
/
"
>
Home
</
a
>
>
<
a
href
="
/pages/reference.html
"
>
Reference
</
a
>
>
<
a
href
="
/pages/data.html
"
>
Data
</
a
>
</
p
>
</
div
>
<
p
>
Returns true if x is a number or can be converted to a number.
</
p
>
<
h3
id
="
example
"
>
Example
</
h3
>
<
div
class
="
sourceCode
"
id
="
cb1
"
>
<
pre
class
="
sourceCode smallbasic
"
>
<
code
class
="
sourceCode smallbasic
"
>
<
span
id
="
cb1-1
"
>
<
a
href
="
#cb1-1
"
aria-hidden
="
true
"
tabindex
="
-1
"
>
</
a
>
<
span
class
="
kw
"
>
print
</
span
>
<
span
class
="
fu
"
>
ISNUMBER
</
span
>
(
<
span
class
="
dv
"
>
12
</
span
>
)
<
span
class
="
co
"
>
' Output 1
</
span
>
</
span
>
<
span
id
="
cb1-2
"
>
<
a
href
="
#cb1-2
"
aria-hidden
="
true
"
tabindex
="
-1
"
>
</
a
>
<
span
class
="
kw
"
>
print
</
span
>
<
span
class
="
fu
"
>
ISNUMBER
</
span
>
(
<
span
class
="
st
"
>
"12"
</
span
>
)
<
span
class
="
co
"
>
' Output 1
</
span
>
</
span
>
<
span
id
="
cb1-3
"
>
<
a
href
="
#cb1-3
"
aria-hidden
="
true
"
tabindex
="
-1
"
>
</
a
>
<
span
class
="
kw
"
>
print
</
span
>
<
span
class
="
fu
"
>
ISNUMBER
</
span
>
(
<
span
class
="
st
"
>
"12E+2"
</
span
>
)
<
span
class
="
co
"
>
' Output 1
</
span
>
</
span
>
<
span
id
="
cb1-4
"
>
<
a
href
="
#cb1-4
"
aria-hidden
="
true
"
tabindex
="
-1
"
>
</
a
>
<
span
class
="
kw
"
>
print
</
span
>
<
span
class
="
fu
"
>
ISNUMBER
</
span
>
(
<
span
class
="
st
"
>
"abc"
</
span
>
)
<
span
class
="
co
"
>
' Output 0
</
span
>
</
span
>
<
span
id
="
cb1-5
"
>
<
a
href
="
#cb1-5
"
aria-hidden
="
true
"
tabindex
="
-1
"
>
</
a
>
<
span
class
="
kw
"
>
print
</
span
>
<
span
class
="
fu
"
>
ISNUMBER
</
span
>
(
<
span
class
="
st
"
>
"1+2"
</
span
>
)
<
span
class
="
co
"
>
' Output 0
</
span
>
</
span
>
<
span
id
="
cb1-6
"
>
<
a
href
="
#cb1-6
"
aria-hidden
="
true
"
tabindex
="
-1
"
>
</
a
>
<
span
class
="
kw
"
>
print
</
span
>
<
span
class
="
fu
"
>
ISNUMBER
</
span
>
(
<
span
class
="
st
"
>
"int(2.4)"
</
span
>
)
<
span
class
="
co
"
>
' Output 0
</
span
>
</
span
>
</
code
>
</
pre
>
</
div
>
<
div
class
="
lavenderBox
"
>
<
div
class
="
header
"
>
Code samples using ISNUMBER
</
div
>
<
div
class
="
linklist
"
>
<
a
target
="
_github
"
href
="
https://raw.githubusercontent.com/smallbasic/smallbasic.samples/master/units/base64.bas
"
>
base64.bas
</
a
>
<
a
target
="
_github
"
href
="
https://raw.githubusercontent.com/smallbasic/smallbasic.samples/master/applications/calc.bas
"
>
calc.bas
</
a
>
<
a
target
="
_github
"
href
="
https://raw.githubusercontent.com/smallbasic/smallbasic.samples/master/system/save as.bas
"
>
save as.bas
</
a
>
<
a
target
="
_github
"
href
="
https://raw.githubusercontent.com/smallbasic/smallbasic.samples/master/applications/TinyBASIC.bas
"
>
TinyBASIC.bas
</
a
>
</
div
>
</
div
>
<
div
class
="
lavenderBox
"
>
<
div
class
="
header
"
>
Data
</
div
>
<
div
class
="
linklist
"
>
<
a
href
="
/reference/581.html
"
>
APPEND
</
a
>
<
a
href
="
/reference/1432.html
"
>
ARRAY
</
a
>
<
a
href
="
/reference/569.html
"
>
DATA
</
a
>
<
a
href
="
/reference/542.html
"
>
DELETE
</
a
>
<
a
href
="
/reference/570.html
"
>
DIM
</
a
>
<
a
href
="
/reference/543.html
"
>
EMPTY
</
a
>
<
a
href
="
/reference/571.html
"
>
ERASE
</
a
>
<
a
href
="
/reference/544.html
"
>
INSERT
</
a
>
<
a
href
="
/reference/555.html
"
>
ISARRAY
</
a
>
<
a
href
="
/reference/556.html
"
>
ISDIR
</
a
>
<
a
href
="
/reference/557.html
"
>
ISFILE
</
a
>
<
a
href
="
/reference/558.html
"
>
ISLINK
</
a
>
<
a
href
="
/reference/1430.html
"
>
ISMAP
</
a
>
<
a
href
="
/reference/559.html
"
>
<
strong
>
ISNUMBER
</
strong
>
</
a
>
<
a
href
="
/reference/560.html
"
>
ISSTRING
</
a
>
<
a
href
="
/reference/561.html
"
>
LBOUND
</
a
>
<
a
href
="
/reference/562.html
"
>
LEN
</
a
>
<
a
href
="
/reference/546.html
"
>
READ
</
a
>
<
a
href
="
/reference/547.html
"
>
REDIM
</
a
>
<
a
href
="
/reference/572.html
"
>
RESTORE
</
a
>
<
a
href
="
/reference/548.html
"
>
SEARCH
</
a
>
<
a
href
="
/reference/549.html
"
>
SORT
</
a
>
<
a
href
="
/reference/550.html
"
>
SWAP
</
a
>
<
a
href
="
/reference/567.html
"
>
UBOUND
</
a
>
</
div
>
</
div
>
</
div
>
<
div
class
="
pagefooter
"
>
This page was last edited on Fri, 21 Apr 2023 10:48:20 +0200
|
<
a
href
="
https://en.wikipedia.org/wiki/Markdown
"
target
="
_blank
"
rel
="
nofollow
"
>
Markdown
</
a
>
processed with
<
a
href
="
https://pandoc.org/MANUAL.html#pandocs-markdown
"
target
="
_blank
"
rel
="
nofollow
"
>
pandoc 3.1.12.1
</
a
>
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>
</
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>
</
div
>
</
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>
</
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>
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