Sure. And there is a dataset with SYSIN data on it, which implies no human 
intervention. What do we do now, explode due to the contradiction?

As I said, my guess is a non-Mainframe training example applied to the 
Mainframe. 

For a COBOL program on the Mainframe, I see no point in "interacting" in TSO. 
It doesn't happen in the wild. Why learn how to do it? Learning for learning, 
sure, but not as training for COBOL on a Mainframe.

On Sunday, 10 July 2016 19:59:02 UTC+2, Dan Skomsky  wrote:
> The original program includes the following statements:
> 
>            DISPLAY "TO END PROGRAM, ENTER 0.".
>            DISPLAY "TO CALCULATE SALES TAX, ENTER THE SALES AMOUNT.".
> 
> The above statements are executed prior to "ACCEPT"ing every inputted amount. 
>   If the intent of this program was to receive input from a file, why would 
> these statements be within the source?  Why would they be repeatedly executed?
> 

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