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Neil
Neil

Reputation: 2058

Changing string based on string contents; (NSExpression decimal issue). Xcode

I am using the NSExpression function to evaluate strings as a numerical equation.

One problem that I have encountered is; when you have a division "/" operation in the string you are calculating NSExpression does not convert the answer into a float point (double) unless a decimal value is given.

Ex. ( 1.0 / 2 ) = 0.5

But ( 1 / 2 ) = 0

I wonder if there is a simple solution to this problem or if I would have to write a loop that inserts ".0" when it detects a division with no other decimals.

I have tried making a loop like this with little success, so if there is a better solution or someone has a loop structure to solve this problem, it would be greatly appreciated.

Thanks, Regards.

Upvotes: 0

Views: 476

Answers (2)

danh
danh

Reputation: 62676

How about, if you detect the presence of slash, cast your expression like this:

myExpressionStr = [[@"(double)(" stringByAppendingString:myExpressionStr] stringByAppendingString:@")"];

Upvotes: 0

fbernardo
fbernardo

Reputation: 10124

Have you considered DDMathParser? From what I found it does a lot of work for you...

Upvotes: 2

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