02-01-2018
Since you refuse to tell us for whom you work, what shell you're using, and what operating system you're using; I have to say that this looks like homework and not like a serious piece of code that any IT professional would release to a normal user.
Therefore, I can only say that my guess at your problem is that your code does not follow the syntax used by a shell that accepts Bourne shell syntax for a case statement. Bourne shell case statement syntax does not allow any code like read statements between the ;; ending the code to be executed for a given pattern and the start of the next pattern matching expression. Your code is also missing the line of code that terminates every case statement. And, of course, your code is using two functions but never defines those functions. It is also unclear to me why you would want to run those two functions concurrently instead of running them sequentially in the code that both adds and subtracts numbers.
You say that your code is supposed to add and subtract numbers, but you haven't said what is supposed to be done with the calculated sum and difference. You haven't specified the format of the numbers to be processed (unsigned or signed numbers; integer, floating point, or complex numbers; decimal only or decimal, octal, hexadecimal, and/or other bases; etc.).
Therefore, there is no way for us to guess at what code you need to reach your goal. And, until you give us some reason to believe that this is not homework (like several other requests we have seen in the past asking for help with VERY similar tasks that were homework assignments) we can't take the chance of doing your homework for you in violation of several educational institutions' guidelines of institutions that support the work we do at The UNIX & Linux Forum.
This User Gave Thanks to Don Cragun For This Post:
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