How to capture user input in dc?

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                          I'd like to handle user input in dc.

For ?, info dc indicates:

    '?'                                                                                                                                                   
        Reads a line from the terminal and executes it.  This command                                                                                    
        allows a macro to request input from the user.

However, if I type this command sequence to square a number, followed by my input 9:

    ?d*p                                                                                                                                                  
    9                                                                                                                                                     

I get:

    dc: stack empty                                                                                                                                       
    dc: stack empty                                                                                                                                       
    dc: stack empty 

Am I misinterpreting what ? does?
                        

Asked by Yimin Rong (953 rep)

Jul 29, 2017, 12:42 PM
Last activity: Jul 29, 2017, 02:07 PM

How to capture user input in dc?

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