CLHS: Section 22.1.3.3.2.1

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## 22.1.3.3.2.1 Examples of Effect of Readtable Case on the Lisp Printer

     (defun test-readtable-case-printing ()
       (let ((*readtable* (copy-readtable nil))
             (*print-case* *print-case*))
         (format t "READTABLE-CASE *PRINT-CASE*  Symbol-name  Output~
                  ~%--------------------------------------------------~
                  ~%")
         (dolist (readtable-case '(:upcase :downcase :preserve :invert))
           (setf (readtable-case *readtable*) readtable-case)
           (dolist (print-case '(:upcase :downcase :capitalize))
             (dolist (symbol '(|ZEBRA| |Zebra| |zebra|))
               (setq *print-case* print-case)
               (format t "~&:~A~15T:~A~29T~A~42T~A"
                       (string-upcase readtable-case)
                       (string-upcase print-case)
                       (symbol-name symbol)
                       (prin1-to-string symbol)))))))

The output from `(test-readtable-case-printing)` should be as follows:

        READTABLE-CASE *PRINT-CASE*  Symbol-name  Output
        --------------------------------------------------
        :UPCASE        :UPCASE       ZEBRA        ZEBRA
        :UPCASE        :UPCASE       Zebra        |Zebra|
        :UPCASE        :UPCASE       zebra        |zebra|
        :UPCASE        :DOWNCASE     ZEBRA        zebra
        :UPCASE        :DOWNCASE     Zebra        |Zebra|
        :UPCASE        :DOWNCASE     zebra        |zebra|
        :UPCASE        :CAPITALIZE   ZEBRA        Zebra
        :UPCASE        :CAPITALIZE   Zebra        |Zebra|
        :UPCASE        :CAPITALIZE   zebra        |zebra|
        :DOWNCASE      :UPCASE       ZEBRA        |ZEBRA|
        :DOWNCASE      :UPCASE       Zebra        |Zebra|
        :DOWNCASE      :UPCASE       zebra        ZEBRA
        :DOWNCASE      :DOWNCASE     ZEBRA        |ZEBRA|
        :DOWNCASE      :DOWNCASE     Zebra        |Zebra|
        :DOWNCASE      :DOWNCASE     zebra        zebra
        :DOWNCASE      :CAPITALIZE   ZEBRA        |ZEBRA|
        :DOWNCASE      :CAPITALIZE   Zebra        |Zebra|
        :DOWNCASE      :CAPITALIZE   zebra        Zebra
        :PRESERVE      :UPCASE       ZEBRA        ZEBRA
        :PRESERVE      :UPCASE       Zebra        Zebra
        :PRESERVE      :UPCASE       zebra        zebra
        :PRESERVE      :DOWNCASE     ZEBRA        ZEBRA
        :PRESERVE      :DOWNCASE     Zebra        Zebra
        :PRESERVE      :DOWNCASE     zebra        zebra
        :PRESERVE      :CAPITALIZE   ZEBRA        ZEBRA
        :PRESERVE      :CAPITALIZE   Zebra        Zebra
        :PRESERVE      :CAPITALIZE   zebra        zebra
        :INVERT        :UPCASE       ZEBRA        zebra
        :INVERT        :UPCASE       Zebra        Zebra
        :INVERT        :UPCASE       zebra        ZEBRA
        :INVERT        :DOWNCASE     ZEBRA        zebra
        :INVERT        :DOWNCASE     Zebra        Zebra
        :INVERT        :DOWNCASE     zebra        ZEBRA
        :INVERT        :CAPITALIZE   ZEBRA        zebra
        :INVERT        :CAPITALIZE   Zebra        Zebra
        :INVERT        :CAPITALIZE   zebra        ZEBRA

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