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'.        



Also see "u2x" in the "[Bag of algorithms]".


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




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