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## 2.4.8.7 Sharpsign B

`#B` rational reads rational in binary (radix 2). For example,

     #B1101 ==  13 ;11012
     #b101/11 ==  5/3

The consequences are undefined if the token immediately following the `#B` does not have the syntax of a binary (i.e., radix 2) rational.

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- SHARP-O-FOOBAR:CONSEQUENCES-UNDEFINED

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