#

##
2.4.8.10 Sharpsign R

`#`*n*`R`

`#`*radix*`R`*rational* reads *rational* in radix *radix*. *radix* must consist of only digits that are interpreted as an *integer* in decimal radix; its value must be between 2 and 36 (inclusive). Only valid digits for the specified radix may be used.

For example, `#3r102` is another way of writing `11` (decimal), and `#11R32` is another way of writing `35` (decimal). For radices larger than 10, letters of the alphabet are used in order for the digits after `9`. No alternate `#` notation exists for the decimal radix since a decimal point suffices.

The next figure contains examples of the use of `#B`, `#O`, `#X`, and `#R`.

#2r11010101 ;Another way of writing 213 decimal
#b11010101 ;Ditto
#b+11010101 ;Ditto
#o325 ;Ditto, in octal radix
#xD5 ;Ditto, in hexadecimal radix
#16r+D5 ;Ditto
#o-300 ;Decimal -192, written in base 8
#3r-21010 ;Same thing in base 3
#25R-7H ;Same thing in base 25
#xACCEDED ;181202413, in hexadecimal radix

**Figure 2-20. Radix Indicator Example**

The consequences are undefined if the token immediately following the `#`*n*`R` does not have the syntax of a *rational* in radix *n*.

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

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