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| ANSI Common Lisp 22 Printer 22.3 Formatted Output 22.3.2 FORMAT Radix Control ### 22.3.2.1 Tilde R: Radix `~nR` prints arg in radix n. The modifier flags and any remaining parameters are used as for the `~D` directive. `~D` is the same as `~10R`. The full form is `~radix,mincol,padchar,commachar,comma-intervalR`. If no prefix parameters are given to `~R`, then a different interpretation is given. The argument should be an integer. For example, if arg is 4: `~R` prints arg as a cardinal English number: `four`. `~:R` prints arg as an ordinal English number: `fourth`. `~@R` prints arg as a Roman numeral: `IV`. `~:@R` prints arg as an old Roman numeral: `IIII`. For example:
     (format nil "~,,' ,4:B" 13)  "1101"
     (format nil "~,,' ,4:B" 17)  "1 0001"
     (format nil "~19,0,' ,4:B" 3333)  "0000 1101 0000 0101"
     (format nil "~3,,,' ,2:R" 17)  "1 22"
     (format nil "~,,'|,2:D" #xFFFF)   "6|55|35"
If and only if the first parameter, n, is supplied, `~R` binds *print-escape* to false, *print-radix* to false, *print-base* to n, and *print-readably* to false. If and only if no parameters are supplied, `~R` binds *print-base* to `10`.

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