nsuinteger

Hello I am working on a project and I am trying to add an NSUInteger to an NSMutableArray. I am new to Objective-C and C in general. When I run the app NSLog displays null. I'd appreciate any help anyone is able to provide. Here is my code -(NSMutableArray *)flipCardAtIndex:(NSUInteger)index { Card *card = [self cardAtIndex:index]; [self.flipCardIndexes addObject:index]; if(!card.isUnplayable) { if(!card.isFaceUp) { for(Card *otherCard in self.cards) { if(otherCard.isFaceUp && !otherCard.isUnplayable) { int matchScore = [card match:@[otherCard]]; if(matchScore) { otherCard.unplayable = YES;

What is the main difference between int , NSInteger and NSUInteger in Objective-C? Which one is better to use in an application and why? In such cases you might right click and go to definition: #if __LP64__ || (TARGET_OS_EMBEDDED && !TARGET_OS_IPHONE) || TARGET_OS_WIN32 || NS_BUILD_32_LIKE_64 typedef long NSInteger; typedef unsigned long NSUInteger; #else typedef int NSInteger; typedef unsigned int NSUInteger; #endif zaph The difference is for abstract types and their associates sized from hardware. In a manner that now we don't have to worry about what size an int is or how big it's pointer

I want to keep NSUInteger into my core data and I don't know which type should I use (integer 16, 32, 64) to suit the space needed. From my understanding: Integer 16 can have minimum value of -32,768 to 32,767 Integer 32 can have minimum value of -2,147,483,648 to 2,147,483,647 Integer 64 can have minimum value of -very large to very large and NSUInteger is type def of unsigned long which equal to unsigned int ( Types in objective-c on iPhone ) so If I convert my NSUInteger to NSNumber with numberWithUnsignedInteger: and save it as NSNumber(Integer 32) I could retrieve my data back safely