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I'm making a system that adds a fee to every transaction of my ERC20 token.
I have two files, wiseth_v1.sol and ERC20Mod.sol written in Solidity.
ERC20.sol is a modification of the ERC20.sol Openzeppelin's contract.
wiseth_v1.sol first lines: 

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "./ERC20Mod.sol";

contract Wiseth is ERC20, Ownable {
    using SafeMath for uint256;
    uint deployDate;
    uint daHour;
    bool isPassed;
    bytes32 num_type;
    uint public percentage;

As you can see, the parent contract is ERC20Mod.sol and its child is wiseth_v1.sol (the true token's script).
The owner of the contract sets the fee's percentage with this function (wiseth_v1.sol): 

function setFirstPercentageFee(uint256 fee) external onlyOwner {
        percentage = fee;
    }

And this is the transferFrom function of the transaction on ERC20Mod.sol: 

function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {

        uint256 fee = (amount.mul(percentage)).div(10000);
        uint256 total = amount.sub(fee);

        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, total);
        return true;
    }

When calculating the fee uint256 fee = (amount.mul(percentage)).div(10000); i need to take the "percentage" uint256 from wiseth_v1.sol, how do i do that? Any help is appreciated. (I don't want to put the wiseth_v1.sol code in ERC20Mod.sol, i want to keep them separate. Thanks.

I searched on Google but only found how to take parent variables in its child. I use remix.ethereum.org

solidity_tryharder
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1 Answers1

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I think that whole logic of inheritance is that child inherit from parent, but you want to do opposite. Maybe you should define your own variable "percentage" in ERC20Mod.sol and manually set it when needed.

Petr Galushkin
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