Hacker Rank: Flipping Bits

//
//  main.m
//  Flipping Bits
//
//  Created by Nathan Arnold on 11/1/15.
//  Copyright © 2015 Nathan Arnold. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...

        int length = 0;
        scanf("%d",&length);
        
        for (int i =0; i< length; i++){
        
            unsigned num  = 0;
            scanf("%u",&num);
            //bitwise NOT
            printf("%u\n",~num);
            
        }
    }
    return 0;
}