How to Cube Root in xcode?

Question

I've been trying to make a specific calculation in xcode with user defined variables. Here's what I have:

-(IBAction)calculate:(id)sender{
    NSString *oneField = self.one.text;
    NSString *twoField = self.two.text;
    double resultInNum;
    double onedouble = [oneField doubleValue];
    double twodouble = [twoField doubleValue];

And what I need to do, is cube root the outcome of

(twodouble/onedouble)

I can't quite find away. Any ideas?

Answer 1

Use the pow function from math.h

pow(x, 1.0/3.0)

Answer 2

Swift

Swift has cubic root functions built in. Here are the signatures:

public func cbrt(_: Double) -> Double public func cbrtf(_: Float) -> Float

The definitions are located in Darwin module on OS X and Glibc module on Linux.

Answer 3

Include math.h and call pow():

 pow(twodouble/onedouble,1.0/3);