need help with calculator program in C

Question

deathscythe129 0 Newbie Poster

19 Years Ago

i need help on how to make a calculator program on C.

for example:
100+3*(344-45)-3/20= ?

ive done a part of it, but it doesnt even give the right answer. the user inputs anything (excluding letters and some puncts). it accepts the equation as a string. ive already converted the string into integers using atoi() fn but im stucked and i dont know what to do next. i made a program similar to this but it doesnt follow the precedence of the operators and it cant compute the answer when you include parenthesis on it...

I need help badly! thanks....

*anything from telling me what to do next will do or any other will do* ill just try to analyze all your answers and see if i can really get it... :lol:

c

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Latest Post 14 Years Ago Latest Post by trenzkun

Narue 5,707 Bad Cop

19 Years Ago

Oddly enough, I answered this very question on another forum yesterday. The trick is to convert the expression to postfix so that you can easily evaluate it with a stack based approach. Alternatively, you could build an expression parse tree, but that just adds extra unnecessary steps in most cases.

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alc6379 120 Cookie... That's it Team Colleague · Answer 1 · 2005-01-11T07:49:22+00:00

Please read the Announcement.

Though I can't specifically say that you're doing a homework problem, the signs are there. We don't do work for you. Please post some code, and we'll help you troubleshoot.

trenzkun -6 Newbie Poster · Answer 2 · 2010-03-16T17:28:10+00:00

i need help on how to make a calculator program on C.
for example:
100+3*(344-45)-3/20= ?
ive done a part of it, but it doesnt even give the right answer. the user inputs anything (excluding letters and some puncts). it accepts the equation as a string. ive already converted the string into integers using atoi() fn but im stucked and i dont know what to do next. i made a program similar to this but it doesnt follow the precedence of the operators and it cant compute the answer when you include parenthesis on it...
I need help badly! thanks....
*anything from telling me what to do next will do or any other will do* ill just try to analyze all your answers and see if i can really get it... :lol:

did you already fix this????? i ned program like yours too.........
could you help me?????please??????????/