Blockchain By Example

Constructors

As with object-oriented programming (OOP), you can define a constructor for your contract. It's a special function using the same name as the contract it belongs to. Unlike in OOP, a contract's constructor is invoked once and only once during the first deployment to the blockchain, and usually defines the initial contract behavior.

In the MyAuction contract, our constructor is extremely simple:

function MyAuction (uint _biddingTime, address _owner,string _brand,string _Rnumber) public {     auction_owner = _owner;    auction_start = now;    auction_end = auction_start + _biddingTime* 1 hours;    STATE = auction_state.STARTED;    Mycar.Brand = _brand;    Mycar.Rnumber = _Rnumber;}

This constructor, upon creation, sets the relevant states by defining ...