# Troncare cifre decimali

**URL:** <https://www.ruby-forum.com/t/troncare-cifre-decimali/165955>\
**Category:** IT\
**Created:** [April 20, 2009, 11:19am UTC](https://www.ruby-forum.com/t/troncare-cifre-decimali/165955 "2009-04-20T11:19:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Salvatore](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/ea666f/32.png) [@Salvatore](https://www.ruby-forum.com/u/Salvatore)\
**Post date:** [April 20, 2009, 11:19am UTC](https://www.ruby-forum.com/t/troncare-cifre-decimali/165955/1 "2009-04-20T11:19:34Z")

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Ciao a tutti e scusate la banalità della domanda ma non riesco a trovare  
nulla che mi possa aiutare.

Ho un numero tipo: 0.09128903812908301293 a me servirebbero le prime 3  
cifre dopo la virgola. C’è un modo veloce per farlo in ruby?

grazie e scusate ancora.

–  
Salvatore

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**Author:** ![Salvatore](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/ea666f/32.png) [@Salvatore](https://www.ruby-forum.com/u/Salvatore)\
**Post date:** [April 20, 2009, 11:25am UTC](https://www.ruby-forum.com/t/troncare-cifre-decimali/165955/2 "2009-04-20T11:25:26Z")

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Puoi usare il metodo %  
[http://www.ruby-doc.org/core/classes/String.html#M000785](http://www.ruby-doc.org/core/classes/String.html#M000785)

2009/4/20 Salvatore [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

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**Author:** ![Salvatore](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/ea666f/32.png) [@Salvatore](https://www.ruby-forum.com/u/Salvatore)\
**Post date:** [April 20, 2009, 11:34am UTC](https://www.ruby-forum.com/t/troncare-cifre-decimali/165955/3 "2009-04-20T11:34:14Z")

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Sandro P. wrote:

> Puoi usare il metodo %  
> [http://www.ruby-doc.org/core/classes/String.html#M000785](http://www.ruby-doc.org/core/classes/String.html#M000785)

Però con questo ti freghi l’approssimazione… prova a guardare su  
questo post: [Operazioni in virgola mobile con ruby - IT - Ruby-Forum](http://www.ruby-forum.com/topic/136616#new)