Objective c: converting string into code

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Hello,

I'm faced with the following problem in my objective-c project for the ipad, maybe somebody has a solution.
I need to parse complex expressions such as: (5+6i)(4-8i) (and many much more complex expressions).
At the moment I need to find a way to convert a string of such an expression into code. For example:

string expression = "(5+6i)(4-8i)";

into:

double complex expressionSolution = (5+6i)(4-8i); (this gives the right answer)

In other words, is there a simple way to convert a string into code?

Posted 2-Jul-13 14:46pm

sinterklaas1212

Updated 2-Jul-13 14:52pm

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Ron Beyer · Answer 1 · 2013-07-02T15:46:00

First thing would be to evaluate the expression into something you can parse:

Converting Postfix Expressions to Infix[^] (In C#, but concept is the same)

Then you need to find out what the tokens are (variables) and assign values to them (in your example, i is a variable token).

After that, its a simple matter of evaluating the infix expression. Infix evaluation is pretty easy, just pop off 2 numbers and an operator, do the operation, push the value back on the stack and repeat until you only have a value on the stack, the value is the answer.