NSArrayNSNumber

<span style="font-size:18px;">     :</span>

<span style="font-size:18px;">(1)      . (2)         ,          .(3)           (4)          ,              
        //1.      
        //(1)       
        //arrayWithObjects                 ,           ,                ,   ,   
        //nil               .  nil    ,              
        NSArray *array1 = [NSArray arrayWithObjects:@"Love", @"Summer", @"Angle",  @"Sunshine", @"Sunshine", nil];
        NSLog(@"array1 = %@", array1);
        //(2)       
        NSArray *array2 = [[NSArray alloc] initWithObjects:@"Love", @"Summer", @"Sunshine", nil];
        NSLog(@"array2 = %@", array2);
        //2.      
        NSUInteger count = [array1 count];
        NSLog(@"count = %ld", count);
        //3.         
        //(1)           
        NSString *str1 = [array1 objectAtIndex:1];
        NSLog(@"str1 = %@", str1);
        //(2)           
        //firstObject   lastObject      objectAtIndex:              ,    nil  objectAtIndex:      crash . index 0 beyond bounds of empty array       
        NSString *str2 = [array1 objectAtIndex:1];
        NSLog(@"str2 = %@", str2);
        NSString *firstObject= [array1 firstObject];
        NSLog(@"firstObject = %@", firstObject);
        //(3)            
        NSString *lastObject = [array1 lastObject];
        NSLog(@"lastObject = %@", lastObject);
        //4.            
        NSUInteger index = [array1 indexOfObject:@"Sunshine"];
        NSLog(@"index = %lu", index);
        //5.          
        BOOL isExist = [array1 containsObject:@"Angle"];
        NSLog(@"isExist = %d", isExist);
        //6.    (   )
        NSArray *sortArr = [array1 sortedArrayUsingSelector:@selector(compare:)];
        NSLog(@"sortArr = %@", sortArr);
        //7.    (    )
        //   
        for (int i = 0; i < [array1 count]; i++) {
            NSString *str = [array1 objectAtIndex:i];
            NSLog(@"%@", str);
        }
        /**
         *  forin     .(    ),             ,
         type *object   //type         
         //object         (    )
         collection :   (      ,   ,   ,     )
         */
        for (NSString *str in array1) {
            NSLog(@"%@", str);
        }
        //8.      
        NSMutableArray *array3 = [[NSMutableArray alloc] initWithObjects:@"Summer", @"Sunshine", @"Angle", @"Cindy", nil];
        NSLog(@"%@", array3);
        //9.    
        [array3 removeLastObject];
        NSLog(@"%@", array3);
        [array3 removeObjectAtIndex:1];
        NSLog(@"%@", array3);
        [array3 removeObject:@"Summer"];
        NSLog(@"%@", array3);
        //10.      
        NSArray *newArr = [array1 arrayByAddingObject:@"Angle"];
        NSLog(@"newArr = %@", newArr);
        //11.          
        NSMutableArray *mutableArray = [NSMutableArray array];
        [mutableArray addObject:@"Love"];
        NSLog(@"mutableArray, = %@", mutableArray);
        //12.          
        [mutableArray setArray:array1];
        NSLog(@"mutableArray = %@",mutableArray);
        //13.             
        [mutableArray addObjectsFromArray:array1];
        NSLog(@"mutableArray, = %@", mutableArray);
        //14.            
        [mutableArray replaceObjectAtIndex:1 withObject:@"lala"];
        NSLog(@"mutableArray = %@",mutableArray);
        //15.                
        [mutableArray exchangeObjectAtIndex:0 withObjectAtIndex:2];
        NSLog(@"mutableArray = %@",mutableArray);
        //16.         
        [mutableArray insertObject:@"xxx" atIndex:1];
        NSLog(@"mutableArray = %@",mutableArray);
        //17.     ,        
        [array3 sortUsingSelector:@selector(compare:)];
        NSLog(@"array3 = %@", array3);
        //18.    
        //            ,          ,               ,id  ,           
        for (NSString *str in array3) {
            NSLog(@"str = %@", str);
        }
        //19.             
        [mutableArray removeAllObjects];
        NSLog(@"mutableArray = %@",mutableArray);
        
        
        //NSNumber    
        //   long long       
        NSLog(@"%lu", sizeof(long long ));
        //1.          
        char a = 'f';
        int  b = 120;
        //        @120;//       NSNumber   
        //        @"120";//      ,NSString   
        short c = 100;
        long d = 1000;
        float e = 10.2;
        double f = 12.25;
        BOOL isTure = YES;
        //2.         NSNumber     
        NSNumber *a1 = [NSNumber numberWithChar:a];
        NSLog(@"%@", a1);
        NSNumber *a2 = [NSNumber numberWithInt:b];
        NSLog(@"%@", a2);
        NSNumber *a3 = [NSNumber numberWithShort:c];
        NSLog(@"%@", a3);
        NSNumber *a4 = [NSNumber numberWithLong:d];
        NSLog(@"%@", a4);
        NSNumber *a5 = [NSNumber numberWithFloat:e];
        NSLog(@"%@", a5);
        NSNumber *a6 = [NSNumber numberWithDouble:f];
        NSLog(@"%@", a6);
        NSNumber *a7 = [NSNumber numberWithBool:isTure];
        NSLog(@"%@", a7);
        //   :
        NSArray *arr = [NSArray arrayWithObjects:a1, a2, a3, a4, a5, a6, a7,nil];
        NSLog(@"%@",arr);
        //     :
        NSArray *arr1 = @[a1, a2, a3, a4, a5, a6, a7];
        NSLog(@"%@",arr1);
        //3. NSNumber             
        char a10 = [a1 charValue];
        NSLog(@"%c", a10);
        int a11 = [a2 intValue];
        NSLog(@"%d", a11);
        //4.NSNumber        
        NSLog(@"%ld",[a1 compare:a2]);
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