坐标转换 ( Co-ordinate Conversions ) 角度单位转换 ( Angular Unit Conversions ) 常量运算 (Constant calculation) ..
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常量标签的限制使分支计算成为了一种O(1)运算，而不是O (n)运算。
The restriction to constant labels enables the branch computation to be an o (1) operation rather than an o (n) operation.
与数值类型相关的其他两个重点是常量(如上例中的100，只是明确表达的数字)和位运算。
Two other important points related to the numeric types are literals, which are just explicitly expressed Numbers, like 100 in the previous examples, and bit operations.
它能包含变量、常量、运算符，例如加号和减号。
It can include variables, constants, and operating symbols, such as plus and minus signs.
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