34 lines
852 B
Markdown
34 lines
852 B
Markdown
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---
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title: Learn About Ruby Numbers
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localeTitle: 了解Ruby Numbers
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---
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### 基本：
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* Ruby有两类数字 - 整数和浮点数（也称为浮点数）。
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* 整数是可以是正数或负数的整数，但不能是分数。
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* 根据它们的大小，整数可以具有`Fixnum`或`Bignum`类。
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* 浮点数是带小数位的数字。
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## 例子：
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```
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x = 5.5
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x.class
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# returns
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Float
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x = 5
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x.class
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# returns
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Fixnum
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x = 11122233344455566677
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x.class
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# returns
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Bignum # basically, Bignum is a very large number
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# <a href='http://ruby-doc.org/core-2.0.0/Bignum.html' target='_blank' rel='nofollow'>read this article for more info</a>
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```
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## 参考文献：
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* [整数的官方Ruby文档](http://ruby-doc.org/core-2.2.0/Integer.html) 。
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* [浮动的官方Ruby文档](http://ruby-doc.org/core-2.2.0/Float.html) 。
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