dc and standard input or heredoc with string command?

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                          dc can read command from a file or/and from standard input.  
If I want to print user input :

    cat essai_dc
    [enter a number : ]
    n
    ?
    p

    dc essai_dc 
      enter a number : 4
      4

Now, if I try with a heredoc :  

    dc  [enter a number : ]
    > n
    > ?
    > p
    > EOF  

    enter a number : dc: stack empty
I get the same with standard input :  

    cat essai_dc | dc
    enter a number : dc: stack empty
The command ? get the p and execute it but the stack is empty.  
Is it possible to get it to work (tell dc to wait for the input)

                        

Asked by ctac_ (1968 rep)

Apr 6, 2021, 01:45 PM
Last activity: Apr 6, 2021, 03:59 PM

dc and standard input or heredoc with string command?

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