数组：

         //1.不可变数组

 //        NSArray *fruitArr = [[NSArray alloc]initWithObjects:@"apple",@"banana",@"pear",@"watermelon",@"longan",nil];

 //        NSLog(@"%@",fruitArr);

 //        NSLog(@"%lu",[fruitArr count]);

 //        NSString *obj = [fruitArr objectAtIndex:2];

 //        NSLog(@"%@",obj);

 //

 //        NSArray *appleArr = [NSArray arrayWithObjects:@"apple",@"banana",@"pear",nil];

 //        NSLog(@"%@",appleArr);

 //

 //        NSArray *names = @[@"tom",@"jack",@"kitty"];

 //        NSLog(@"%@",names);

         //2.可变数组

          NSMutableArray *languages=[NSMutableArray array];

         [languages addObject:@"c++"];

         [languages addObject:@"oc "];

         [languages addObject:@"java"];

         [languages addObject:@"php"];

         NSLog(@"%@",languages);

         [languages insertObject:@"swift" atIndex:];

         NSLog(@"%@",languages);

         [languages removeObject:@"php"];

         [languages removeObjectAtIndex:];

         [languages replaceObjectAtIndex: withObject:@"c#"];

         NSLog(@"%@",languages);

         //数组的遍历

 //        for (int i=0; i<[languages count]; i++) {

 //            NSLog(@"第%d个对象：%@",i+1,[languages objectAtIndex:i]);

 //        }

         //

         for (NSString *obj in languages) {

             NSLog(@"%@",obj);

         }