Objective-C unsigned int ( NSUInteger )

輸出 NSUInteger，格式指定符為 %u 或是 %lu (long unsigned)
取得字串長度:

NSString *city = @"Taichung";
NSUInteger cityLength = [city length];
NSLog(@"City has %u characters", cityLength)

result:

City has 8 characters

數學運算:

NSNumber *price = [NSNumber numberWithInt: 20];
NSNumber *amount = [NSNumber numberWithInt: 6];

NSUInteger priceInt = [price unsignedIntValue];
NSUInteger amountInt = [amount unsignedIntValue];
NSUInteger total = priceInt * amountInt;

NSLog(@"Total price is %lu", total);

result:

Total price is 120

NSUInteger 的宣告無 * 符號

輸出 NSInteger，格式指定符為 %d 或是 %ld (long)，取值訊息為 intValue。