Sharpsign R (ANSI and GNU Common Lisp Document)

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#### 2.4.8.11 Sharpsign R

`#nR`

`#radixRrational` 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.

Figure 2–20 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 `#nR` does not have the syntax of a rational in radix n.