http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/scan.htm 






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display and numeric format for ASCII characters.  
display and numeric format for ASCII characters.  Scan provides the
usual answer:
    foreach character {a A b B c} {
        scan $character %c numeric
        puts "ASCII character '$numeric' displays as '$character'."
    }

    ASCII character '97' displays as 'a'.
    ASCII character '65' displays as 'A'.
    ASCII character '98' displays as 'b'.
    ASCII character '66' displays as 'B'.
    ASCII character '99' displays as 'c'.        





** Effect on the Internal Representation of a Value **


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