gistfile1.m

//
//  main.m
//  NSStringHash
//
//  Created by Tonny Xu on 2/10/13.
//  Copyright (c) 2013 Tonny Xu. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
  
  @autoreleasepool {
    
    // insert code here...
    NSString *s = @"Hello, World!";
    NSUInteger hashCode0 = s.hash;
    CFHashCode hashCode1 = CFStringHashNSString(s);
    CFHashCode hashCode2 = __CFStringHash(s);
    
    NSLog(@"%ld", hashCode0);
    NSLog(@"%ld", hashCode1);
    NSLog(@"%ld", hashCode2);
    
    NSLog(@"%lX", hashCode0);
    NSLog(@"%lX", hashCode1);
    NSLog(@"%lX", hashCode2);

    NSString *longStrMoreThan96 = @"1234567890123456789012345678901_abcdef_234567890123456789012345678901_abcdef_2345678901234567890123456789012";
    NSString *longStrIs96 = @"1234567890123456789012345678901_ABCDEF_234567890123456789012345678901_ABCDEF_2345678901234567890123456789012";
    NSLog(@"%ld", longStrMoreThan96.hash);
    NSLog(@"%ld", longStrIs96.hash);
    NSLog(@"%lX", longStrMoreThan96.hash);
    NSLog(@"%lX", longStrIs96.hash);
    
  }
  return 0;
}

output.txt

2013-02-10 21:12:57.704 NSStringHash[25996:303] 3294171457232409974
2013-02-10 21:12:57.707 NSStringHash[25996:303] -1315859082
2013-02-10 21:12:57.707 NSStringHash[25996:303] -1315859082
2013-02-10 21:12:57.707 NSStringHash[25996:303] 2DB73F7CB1919576
2013-02-10 21:12:57.708 NSStringHash[25996:303] FFFFFFFFB1919576
2013-02-10 21:12:57.708 NSStringHash[25996:303] FFFFFFFFB1919576
2013-02-10 21:12:57.708 NSStringHash[25996:303] -8069816457736624960
2013-02-10 21:12:57.709 NSStringHash[25996:303] -8069816457736624960
2013-02-10 21:12:57.709 NSStringHash[25996:303] 900240AFFA01E4C0
2013-02-10 21:12:57.710 NSStringHash[25996:303] 900240AFFA01E4C0