How to convert NSNumber objects for computational purposes?

Question

I an developing some code in which I use a scanner to get to NSNumbers from a string, say x and y.

Now I want to compute something simple from x and y, say, z = 10.0

Answer 1

Use the "value" methods of the NSNumber class such as doubleValue.

// Initialized to something earlier
NSNumber * x, y;

//Convert NSNumbers to double
double xD = [x doubleValue]; 
double yD = [y doubleValue];

// You can now use regular arithmetic operators
double zD = 10.0 / ((x + y / 60.0) / 60.0);