"Expected a state variable declaration. If you intended this as a fallback function or a function to handle plain ether transactions, use the "fallback" keyword or the "receive" keyword instead." Code Answer's

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Expected a state variable declaration. If you intended this as a fallback function or a function to handle plain ether transactions, use the

Tinker Bell on Apr 29, 2020

pragma solidity >=0.4.22 <0.6.0;

contract OwnedToken {
    // `TokenCreator` is a contract type that is defined below.
    // It is fine to reference it as long as it is not used
    // to create a new contract.
    TokenCreator creator;
    address owner;
    bytes32 name;

    // This is the constructor which registers the
    // creator and the assigned name.
    constructor(bytes32 _name) public {
        // State variables are accessed via their name
        // and not via e.g. `this.owner`. Functions can
        // be accessed directly or through `this.f`,
        // but the latter provides an external view
        // to the function. Especially in the constructor,
        // you should not access functions externally,
        // because the function does not exist yet.
        // See the next section for details.
        owner = msg.sender;

        // We do an explicit type conversion from `address`
        // to `TokenCreator` and assume that the type of
        // the calling contract is `TokenCreator`, there is
        // no real way to check that.
        creator = TokenCreator(msg.sender);
        name = _name;
    }

    function changeName(bytes32 newName) public {
        // Only the creator can alter the name --
        // the comparison is possible since contracts
        // are explicitly convertible to addresses.
        if (msg.sender == address(creator))
            name = newName;
    }

    function transfer(address newOwner) public {
        // Only the current owner can transfer the token.
        if (msg.sender != owner) return;

        // We ask the creator contract if the transfer
        // should proceed by using a function of the
        // `TokenCreator` contract defined below. If
        // the call fails (e.g. due to out-of-gas),
        // the execution also fails here.
        if (creator.isTokenTransferOK(owner, newOwner))
            owner = newOwner;
    }
}

contract TokenCreator {
    function createToken(bytes32 name)
       public
       returns (OwnedToken tokenAddress)
    {
        // Create a new `Token` contract and return its address.
        // From the JavaScript side, the return type is
        // `address`, as this is the closest type available in
        // the ABI.
        return new OwnedToken(name);
    }

    function changeName(OwnedToken tokenAddress, bytes32 name) public {
        // Again, the external type of `tokenAddress` is
        // simply `address`.
        tokenAddress.changeName(name);
    }

    // Perform checks to determine if transferring a token to the
    // `OwnedToken` contract should proceed
    function isTokenTransferOK(address currentOwner, address newOwner)
        public
        pure
        returns (bool ok)
    {
        // Check an arbitrary condition to see if transfer should proceed
        return keccak256(abi.encodePacked(currentOwner, newOwner))[0] == 0x7f;
    }
}

Source: solidity.readthedocs.io

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"Expected a state variable declaration. If you intended this as a fallback function or a function to handle plain ether transactions, use the "fallback" keyword or the "receive" keyword instead." Code Answer's