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operator class: #import <Foundation/Foundation.h> @interface operator : NSObject { int number; } @property int number; @end @implementation operator - (id)init{ self = [super init]; if (self) { [self setNumber:0]; } return self; } @synthesize number; @end main.m: #import <UIKit/UIKit.h> #import "operator.m" int main(int argc, char *argv[]) { id operator1 = [[operator alloc] init]; id operator2 = [[operator alloc] init]; [operator1 setNumber:10]; [operator2 setNumber:20]; int answer = [operator1 number] + [operator2 number]; printf("The answer is %d",answer); NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, nil); [pool release]; return retVal; } I get an error -> ld: duplicate symbol _OBJC_IVAR_$_operator.number in /Volumes/Home/Desktop/testing/build/testing.build/Debug-iphonesimulator/testing.build/Objects-normal/i386/operator.o and /Volumes/Home/Desktop/testing/build/testing.build/Debug-iphonesimulator/testing.build/Objects-normal/i386/main.o This is my very first time I program in ObjC. Am I doing something wrong? I tried the "Clean all targets" fix that I found on google but did not help.

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