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'''C'''omma '''S'''eparated '''N'''umber

Separates digits of an integer in groups of three; works for numbers under 1E15.
Only positive numbers are supported, larger numbers are just provided in their standard output form.

Csn does some additional things that formatnum does not: rounding to an integer, removing leading zeros, removing - from -0, writing in scientific notation, computations.

;Examples comparing csn and <nowiki>{{formatnum:</nowiki> ''number'' }}
:{{evaldemo/3|csn/Csn demo|-1|s==}}
:{{evaldemo/3|csn/Csn demo|-0|s==}}
:{{evaldemo/3|csn/Csn demo|0.1|s==}}
:{{evaldemo/3|csn/Csn demo|1.23|s==}}
:{{evaldemo/3|csn/Csn demo|12.3|s==}}
:{{evaldemo/3|csn/Csn demo|6*20|s==}}
:{{evaldemo/3|csn/Csn demo|1234|s==}}
:{{evaldemo/3|csn/Csn demo|1230|s==}}
:{{evaldemo/3|csn/Csn demo|1200|s==}}
:{{evaldemo/3|csn/Csn demo|1000|s==}}
:{{evaldemo/3|csn/Csn demo|0000|s==}}
:{{evaldemo/3|csn/Csn demo|12345.67890123456|s==}}
:{{evaldemo/3|csn/Csn demo|123456.7890123456|s==}}
:{{evaldemo/3|csn/Csn demo|1234567.890123456|s==}}
:{{evaldemo/3|csn/Csn demo|12345678.90123456|s==}}
:{{evaldemo/3|csn/Csn demo|123456789.0123456|s==}}
:{{evaldemo/3|csn/Csn demo|1234567890.123456|s==}}
:{{evaldemo/3|csn/Csn demo|12345678901.23456|s==}}
:{{evaldemo/3|csn/Csn demo|123456789012.3456|s==}}
:{{evaldemo/3|csn/Csn demo|1234567890123.456|s==}}
:{{evaldemo/3|csn/Csn demo|12345678901234.56|s==}}
:{{evaldemo/3|csn/Csn demo|123456789012345.6|s==}}
:{{evaldemo/3|csn/Csn demo|1234567890123456.|s==}}
:{{evaldemo/3|csn/Csn demo|12|s==}}
:{{evaldemo/3|csn/Csn demo|1234|s==}}
:{{evaldemo/3|csn/Csn demo|123456|s==}}
:{{evaldemo/3|csn/Csn demo|12345678|s==}}
:{{evaldemo/3|csn/Csn demo|1234567890|s==}}
:{{evaldemo/3|csn/Csn demo|123456789012|s==}}
:{{evaldemo/3|csn/Csn demo|12345678901234|s==}}

<nowiki>{{subst:csn|123456789012345|subst=subst:}}</nowiki> gives the wikitext 123,456,789,012,345

<nowiki>{{subst:formatnum:123456789012345}}</nowiki> gives the wikitext 123,456,789,012,345

{{evaldemo/3|csn/Csn demo|1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17|s==}}.
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