Receiving ERC20 token after having sent ETH [closed]

Question

I want to implement the possibility to receive token after having sent eth to the contract. How can i do? Maybe i have to modify this function?

function () public payable {
    revert();   
}

Answer 1

You have left out one important detail: Is the token a different contract?

If we suppose that the token is in a separate contract and want to send 10 tokens for each ether contributted (I'm assuming the token has 18 decimals like ether)

ERC20 token; // <-- Token address assigned on the constructor for example.

function () public payable {
    // Received amount of ether
    uint amount = msg.value;
    // Convert to tokens
    uint tokens = amount * 10;
    // Transfer tokens assigned to this contract to sender
    token.transfer(msg.sender, tokens);
}

For the ERC20 contract interface you can use the OpenZeppelin implementation.

I'd recommend to take a look a the other contracts implemented by the OpenZeppelin team so you have a better idea how to program other things.