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copied!<p>There are of course many ways to set this up. I can remember being confused when starting out, below is an alternative example to give you something else to look at. </p> <p>It is not intended to be fancy but just bare-bones so that you can see a minimal setup of the class with an initializer. </p> <p>Note that the only value initialized is the const pi, of course, the radius can be initialized there as well, as nhgrif's example shows quite nicely.</p> <p>Hope this helps!</p> <pre><code>// Circle.h #import <Foundation/Foundation.h> @interface Circle : NSObject { double radius; double pi; } @property double radius, pi; -(double) getArea; -(double) getDiameter; -(double) getCircumference; @end </code></pre> <p>And then the implementation:</p> <pre><code>// Circle.m #import "Circle.h" @implementation Circle @synthesize radius, pi; // Initialize with const pi: - (id)init { self = [super init]; if (self) { pi = 3.14159; NSLog(@"Circle created."); } return self; } -(double) getArea { return pi*radius*radius; } -(double) getDiameter { return 2*radius; } -(double) getCircumference { return 2*pi*radius; } @end </code></pre> <p>And then for main:</p> <pre><code>// main.m #import <Foundation/Foundation.h> #import "Circle.h" int main(int argc, const char * argv[]) { @autoreleasepool { Circle *aCircle = [[Circle alloc] init]; // Use an arbitrary value: [aCircle setRadius:2]; NSLog(@"Area = %f",[aCircle getArea]); NSLog(@"Circumference = %f",[aCircle getCircumference]); NSLog(@"Diameter = %f",[aCircle getDiameter]); NSLog(@"Check pi = %f",[aCircle pi]); } return 0; } </code></pre>

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