Try this:
NSNumber *fieldOne = [managedObject valueForKey:@"key1"];
NSNumber *fieldTwo = [managedObject valueForKey:@"key2"];
NSNumber *fieldThree = [managedObject valueForKey:@"key3"];
NSNumber *answer;
if (fieldTwo > 0) {
answer = ((fieldTwo - fieldOne) + fieldThree);
[self.managedObject setValue:[answer intValue] forKey:@"key4"];
}
-koko
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