//
//  main.m
//  OC05-task-05
//
//  Created by Xin the Great on 15-1-26.
//  Copyright (c) 2015Äê Xin the Great. All rights reserved.
//

#import 
  
   

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        //////////////////////NSValue//////////////////
        
        //NSValue ¿ÉÒÔ°ü×°ÈÎÒâÖµ
        NSRange range = {1, 5};
        
        //½«½á¹¹Ìå°ü×°³É¶ÔÏó
        NSValue *value = [NSValue value:&range withObjCType:@encode(NSRange)];
        NSLog(@"value is %@", value);
        
        //»¹Ô­
        NSRange newRange;
        [value getValue:&newRange];
//        NSLog(@"%ld, %ld",newRange.location, newRange.length);
        NSLog(@"%@",NSStringFromRange(newRange));
        
        
        /////////////////////NSNull//////////////////////
        //±íʾһ¸ö¿Õ¶ÔÏó
        NSNull *null = [NSNull null];
        NSArray *arr = @[@"1", @"2", null, @"3"];
        NSLog(@"arr is %@", arr);
        
        
    }
    return 0;
}