[OC Foundation框架 - 12] NSNumber

 1 void number()
 2 {
 3     NSNumber *number = [NSNumber numberWithInt:10];
 4     NSMutableArray *array = [NSMutableArray array];
 5     [array addObject:number];
 6    
 7     NSLog(@"%@", array);
 8    
 9     NSNumber *num1 = [array lastObject];
10     int n = [num1 intValue];
11 }

1 NSArray *array61 = [NSArray arrayWithObjects:@0, @1, @2, @3, @4, @5, @6, @7, @8, @9, nil];

1         int age = 100;
2         NSNumber *num = @(age);