Need a little help coding math for an iphone app...

Question

I am having trouble coding the following for an application that has to do with math calculations for an iphone application. I was hoping for at least someone to point me in the right direction/
I have two text boxes, and I want the application to add the two together. Then with a picker slider I want to be able to select a percentage of that number. Than multiply it by another number 1-30 on a picker slider. and then produce the product in another text box.
If you need more details please let me know... thanks

Answer 1

The following assumes "text boxes" means instances of UITextField, and these have been declared as textField1 and textField2 (we'll also assume you've ensured the text is numeric or coaxed the user into cooperating):
// get the two numbers and add them together
NSString *digits1 = textField1.text;
NSString *digits2 = textField2.text;
int n1 = [digits1 intValue];
int n2 = [digits2 intValue];
int nTotal = n1 + n2;
// we now assume two instances of UISlider declared
// as percentSlider, inited to 0-100, and multSlider
// inited to 0-30
// get the slider settings and compute answer
int nPercent = round(percentSlider.value);
int nMultipier = round(multSlider.value);
float fResult = nTotal * nMultiplier * (float)nPercent/100;
// assume instance of UILabel to display result
label.text = [NSString stringWithFormat:@"%2.2f", fResult];
I didn't build a test bed for the above so be aware it's not working code, but hope it helps.