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# Problem in stack(data structure in C)

How to write a program using stack (in C language)which functions almost like a calculator. the program will receive inputs like for example : 12 * (15 - 6) + 388
The program will calculate +, -, *, /, (), operations.
The priority operations are :

1st. ( )
2nd. *, /
3rd. +, -

The program will print the operation for example like The question above :

15 - 6
12 * 9
108 + 388
= 496
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tagheuer
1 Solution

Commented:
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Commented:
I would solve this problem with a recursive function

pseudo code :

double solve (equation)
{
while ()
stop if you have as many (
as )
solve (equation between () )  -> same function
substitute result in equation

while *, /
isolate equation with * or /
solve (equation with * or /)
substitute result in equation

now you have an equation with only + and - => add (equation)
return result
}

hope this helps ...

Stefaan
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Author Commented:
I want more details about the codes.
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Commented:
0

Commented:
>> I want more details about the codes

Can you be a little bit more specific? What part do you not understand?

Stefaan
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Commented:

Quite, but what you need is a Reverse Polish Expression Evaluator. Take virtually any text book and look up Reverse Polish. You usually find the algorithm there. I'm NOT going to hack one in.

Furthermore you should now give the points away to the first person (Rat excepted) who can tell you the actual NAME of the person after whom the algorithm is called. His name is rarely used since it's almost unpronounceable.
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Commented:
What further problems do you have?
0

Commented:
Jan Lukasiewicz
But rather than bother converting to his notation, I'd probably do it with either a recursive descent, or an inside-out evaluator
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