NSUInteger(unsigned int) subtraction results

gistfile1.m

- (void)viewDidLoad
{
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  
  NSUInteger a = 5, b = 10;
  NSInteger c = 8;

  NSLog(@" a - b = %d", a - b);
  // a - b = -5
  
  NSLog(@"(a - b <= 0) is %@", (a - b <= 0) ? @"true" : @"false");
  // (a - b <= 0) is false
  
  NSLog(@"((NSInteger(a - b) <= 0) is %@", ((NSInteger)(a - b) <= 0) ? @"true" : @"false");
  // ((NSInteger(a - b) <= 0) is true
  
  NSLog(@"(((NSInteger)a - (NSInteger)b) <= 0)  is %@", (((NSInteger)a - (NSInteger)b) <= 0) ? @"true" : @"false");
  // (((NSInteger)a - (NSInteger)b) <= 0)  is true
  
  NSLog(@"((b - c) <= 0) is %@", ((b - c) <= 0) ? @"true" : @"false");
  // ((b - c) <= 0) is false

  NSLog(@"((c - b) <= 0) is %@", ((c - b) <= 0) ? @"true" : @"false");
  // ((c - b) <= 0) is false
  
  NSLog(@"((NSInteger)(c - b) <= 0) is %@", ((NSInteger)(c - b) <= 0) ? @"true" : @"false");
  // ((NSInteger)(c - b) <= 0) is true
}