Blockchain By Example

Constructor

The constructor of our token sale contract will take two arguments:

• The address of our ERC-20 token contract
• The token price

At the head of our contract, we will assign two public state variables to hold the values passed into the constructor. Importantly, we use the type definition from our token contract when assigning the passed-in address:

contract PacktTokenSale {    PacktToken public tokenContract;    uint256 public tokenPrice;    address owner;     constructor(PacktToken _tokenContract, uint256 _tokenPrice) public {        owner = msg.sender;        tokenContract = _tokenContract;        tokenPrice = _tokenPrice;    } }