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#Xrational reads rational in hexadecimal (radix 16). The digits above 9 are the letters A through F (the lowercase letters a through f are also acceptable). For example,

 #xF00 ==  3840             
 #x105 ==  261 ;10516

The consequences are undefined if the token immediately following the #X does not have the syntax of a hexadecimal (i.e., radix 16) rational.

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

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