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    % set hex 3A
    3A
    % scan $hex %x decimal
    1
    % set decimal
    58
'''Decimal to hex:'''
 format %4.4X $decimalNumber
Notice that the ".4" part gives leading zeroes, and does
'''not''' have to do with the fractional (right-of-the-point)
part of the number.

'''Character to hex''':
 format %4.4X [scan $c %c]

Notice that "[[scan $c %c]]" only does what one wants with newer
Tcl's, those since version 8.??