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Message: <blockquote data-quote="zijianz" data-source="post: 1407390" data-attributes="member: 253681">First, I am really new in this area, please forgive my slow,I saw codes like'@property (nonatomic) double topSpeed; ' in the header file to declare a public variable in class. It will create a setter and getter automatically. And we declare the implementation to the setter getters in the implementation file like"@synthesize topSpeed = _topSpeed"I wonder why do we use _topSpeed? Since we didn't declare a variable called _topSpeed.To be more straightforward, what are topSpeed and _topSpeed exactly? Are those both variables or methods name? Is that mean whenever we declared @property type something, it will automatically generate a variable called _something?THank you.</blockquote>