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 9 Status Inquiry
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 'Z'
      Pops a value off the stack, calculates the number of digits it has
      (or number of characters, if it is a string) and pushes that
      number.
 
      Note that the digit count for a number does _not_ include any
      leading zeros, even if those appear to the right of the radix
      point.  This may seem a bit strange at first, but it is compatable
      with historical implementations of 'dc', and can be argued to be
      useful for computing the magnitude of a value: 'dSaXLaZ-' will
      compute the power-of-ten multiplier which would be needed to shift
      the decimal point to be immediately before the leftmost non-zero
      digit.
 
 'X'
      Pops a value off the stack, calculates the number of fraction
      digits it has, and pushes that number.  For a string, the value
      pushed is 0.
 
 'z'
      Pushes the current stack depth: the number of objects on the stack
      before the execution of the 'z' command.
 

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