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13.1.4.6 Digits in a Radix

What qualifies as a *digit* depends on the *radix* (an *integer* between `2` and `36`, inclusive). The potential *digits* are:

`0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z`

Their respective weights are `0`, `1`, `2`, ... `35`. In any given radix n, only the first n potential *digits* are considered to be *digits*. For example, the digits in radix `2` are `0` and `1`, the digits in radix `10` are `0` through `9`, and the digits in radix `16` are `0` through `F`.

*Case* is not significant in *digits*; for example, in radix `16`, both `F` and `f` are *digits* with weight `15`.

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