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Shell script that implements a simple calculator for integer arithmetic.

Hey Guys/Gals... I'm interested in writing a shell script that implements a simple calculator for integer arithmetic. The calculator should prompt the user and receive its input in following manner:

Enter the first operand: 4
Enter an operator: *
Enter the second operand: 3
Answer: 4 * 3 = 12
Assume that in this example the user entered 4, * and 3 in response to the scripts prompting.
The permissible operators that the calculator should be able to handle are: +,-,*,/ and %. The
calculator should continue running until the user enters the character x at any of the prompts.

Thanks in advance for your help!

skyper3

Hm, is there a class which has homework in shellscripting? ;)
You'd have to use a combination of expr, read and test

ahoffmann

echo '4*3'|bc
echo '3 4 * p'|dc

This is too stupid for a real homework :-))

djwburr

ASKER

I'm trying out some exercises I came across in a book and having problems with a few. The calculator is supposed to be able to accept other integers and not just the ones in the example. Thanks again

ASKER CERTIFIED SOLUTION

skyper3

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ahoffmann

ROFLOL, 10 lines of code what could be written in one line with just 9 characters (beside the payload), I guess it could be improved to a modern application with some gigs of code and data and bugs and ... ;-))

(skyper3, no offence at all, just about what was asked for and accepted)

BTW, RES=$(....) is invalid syntax for sh (read the manuals:)