To instantiate an existing contract, we need to know its address. For example, in our contract, we will instantiate the Cplayer contract in the Ctontine constructor as follows:

constructor(address _CplayerAddress) public {
    Tplayer = Cplayer(_CplayerAddress);
}

The Cplayer(_CplayerAddress); expression will perform an explicit conversion of the Cplayer type, stating that "we know that the contract at the given address of _CplayerAddress is of the Cplayer type." It's worth noting that instantiating a contract using its address doesn’t imply the execution of its constructor.

The interaction with a deployed contract is a very powerful feature as it allows code reusability, since deployed contracts can be used like libraries. Furthermore, if we implement a pattern that enables us to change the used contract, instantiation can help us avoid reusing faulty contracts by changing the contract address.