Interesting Names Challenge

Objective-C Programming (2nd Edition) 17. NSArray
1

Hi there, I’ve only used one external file for this challenge — the one containing both proper names and regular words:

[code]//
// main.m
// InterestingNames
//
// Created by Antony Kwok on 23/10/2014.
// Copyright © 2014 Big Nerd Ranch. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
@autoreleasepool {

    // Read a file as a huge string (ignoring the possibility for error)
    NSString *nameString = [NSString stringWithContentsOfFile:@"/usr/share/dict/words"
                                                     encoding:NSUTF8StringEncoding
                                                        error:NULL];
    
    // Break it into an array of strings
    NSArray *names = [nameString componentsSeparatedByString:@"\n"];
    
    int index = 0; // (int)index is used as a progression tracker so that every (NSString *)n item only compares itself to posterior items in the array. Very important as it speeds up the running time considerably.
    
    NSUInteger occurences = 0; // identical words counter
    
    for (NSString *n in names) {
        
        if ([n length] > 1) { // Excludes the letters of the alphabet
            
            // Compare with items in the array following current (NSString *)n
            for (int i = index + 1; i < index + 3 && i < [names count]; i++) {
                if ([n caseInsensitiveCompare:names[i]] == NSOrderedSame) {
                    NSLog(@"%@ is the same as %@", n, names[i]);
                    occurences++;
                    NSLog(@"%lu", (unsigned long)occurences);
                }
            }
        }
        index++;
    }
    
    // How many identical occurences have been found?
    NSLog(@"%lu identical occurences have been found.", (unsigned long)occurences);
    
}
return 0;

}
[/code]