> For the complete documentation index, see [llms.txt](https://emacs-lisp.ivory.cafe/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emacs-lisp.ivory.cafe/lisp-shu-ju-lei-xing/bian-cheng-lei-xing/2.4.1-zheng-shu-xing.md).

# 2.4.1 整型

隐藏在整型黑盒内部的, 是两种整型: 一种(fixnums)用于较小的数字 , 另一种(bignums)用于较大的数字.

其中 fixnums 类型的取值范围取决于具体的机器. 最小的范围是-536,870,912 到 536,870,911 (30位), 不过大多数机器支持的范围更大.

bignums 拥有任意大小的精度. 数字在 fixnums 类型中溢出时便会自动返回 bignums 类型的版本.

所有的数字都可以使用 eql 或 = 进行比较. fixnums 也可以使用 eq 比较. 你可以将数字和 most-negative-fixnum 和 most-positive-fixnum 比较, 以此来判断一个数是 fixnum 还是 bignum. 当然, 你还可以使用谓语 fixnump 和 bignump 来测试。

整型数的阅读语法是十进制的数字序列表示, 可以加上额外的正负号, 或者点, 打印表示并不会包含正负号, 也不会出现点。

```
-1               ; 整数 -1.
1                ; 整数 1.
1.               ; 还是整数 1.
+1               ; 同样是整数 1.
```

详情查阅 数字章节


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