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  ANSI Common Lisp   2 Syntax   2.4 Standard Macro Characters   2.4.8 Sharpsign Sharpsign R


#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.

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

Radix Indicator Example
#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

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

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