LESSON 3 fundMe getConversionRate videoTime 4:17:24 DeclarationError: Undeclared Identifier

[franclino]

Hi guys. I´m getting this error

my code is this basically copying everything Patrick did:

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.8;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract FundMe {

uint256 public minimumUsd = 50;

function fund() public payable{
    //want to be able to set a minimum fund amount in USD
    //1.How do we send ETH to this contract?

    require(msg.value >= minimumUsd, "Didnt send enough!");
}

function getPrice() public view returns (uint256) {
    // ABI
    // Address 0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e
    AggregatorV3Interface priceFeed = AggregatorV3Interface(0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e);
    (,int256 price,,,) = priceFeed.latestRoundData();
    //ETH in terms of USD
    //3000.00000000
    return uint256(price * 1e10); //1**10 00000000
}

function getVersion() public view returns (uint256) {
    AggregatorV3Interface priceFeed = AggregatorV3Interface(0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e);
    return priceFeed.version();
}

function getConversionRate(uint256 ethAmount) public view returns (uint256) {
    uint256 ethPrice = getPrice();
    uint256 ethAmount = (ethPrice * ethAmount) / 1e18; 
return ethAmountInUsd;
}



//function withdraw(){}

}

i cannot find my mistake could you help?

Thank you,

franclino

[Nlferu]

Hello @franclino

You have used incorrect variable in getConversionRate() function, you have just used ethAmount in wrong place, function should look like below:

    function getConversionRate(uint256 ethAmount) public view returns (uint256) {
        uint256 ethPrice = getPrice();
        uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1e18; 
        return ethAmountInUsd;
    }

[cromewar]

This must be the solution, amazing @Neftyr
Does this make sense to you @franclino?

[franclino]

Hi! yes i see it thank you so much!

[cromewar]

setting this up as answer then!