(dc.info.gz) Status Inquiry

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 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.
 
 `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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