Sharpsign X

#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 ;105{{}_{16}}

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

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