[mindwaves]

I am a college student and I have to design a calculator basically in a console window and I dont have to design the thing, I just have to prompt for something and the user types what he/she wants. I only have to do multiplication. divisio. addition, subtraction, and modulus. I know how to scanf but how do I tell the program to add or subtract when I do not know what the user wants. Thanks.

Check out Calc1

[mindwaves]

I dont need a calculator i just need to make one!

[Paul Crawford]

Hi mindwaves,

Do you mean that you need to be able to handle input strings containing arbitrary arithmetical expressions [e.g., "1+2*3/4+(5-6)"]? If so, you would probably need to use a parser-generator such as Lexx/Yacc, or to write your own full-fledged lexical analyser (grammar parser), which is not exactly a trivial task...

This takes me back to the good old days of parser algorithms, too far back to offer much direct help I'm afraid. ;-) Which CS textbook are you using? If you don't find it to be of much help, try browsing/searching for alternative ones that received good reviews at BookPool, or Amazon, etc.

When you're writing the program, if you need further assistance with a specific piece of code then post back and either I or someone else can try to help you.

Regards,

--Paul

[This message has been edited by Paul Crawford (edited 11-01-2000).]

[mindwaves]

Thanks for all the help but I already turned it in and I got a pretty decent score.

[Paul Crawford]

Hi again,

Way to go! Best wishes for your future programming endeavours. :-)

Regards,

--Paul