General Thread for practicing question formatting

[sansarmaske]

I have this function for getting conversion rate:

function getConversionRate(uint256 ethAmount)  view returns(uint256){
        uint256 ethPrice = getPrice();

        uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1e18;
        return ethAmountInUsd;
    }

and I am getting following error when trying to compile:

from solidity:
SyntaxError: No visibility specified. Did you intend to add "public"?
  --> contracts/PriceConverter.sol:20:5:
   |
20 |     function getConversionRate(uint256 ethAmount)  view returns(uint256){
   |     ^ (Relevant source part starts here and spans across multiple lines).

Can somebody help?

[sarahpng]

function transfer(uint256 amount, address receiver) public {
balance[receiver] += amount;
balance[msg.sender] -= amount;
}

this is a practice code for formatting.

[Flopicek]

Only for practice:

 function fund() public {
        // payable change the function to be able to get currency
        // Want to be able to set a minimum amount of ETH
        // 1. How do we send ETH to this co
        require(msg.value.getConversionRate() >= MINIMUM_USD, "Did not send enough"); // // 1e18 == 1 * 10 ** 18
        funders.push(msg.sender); // 
        addressToAmountFunded[msg.sender] += msg.value; //  
    }

On this function I am running into an error:

TypeError: "msg.value" and "callvalue()" can only be used in payable public functions. Make the function "payable" or use an internal function to avoid this error.

Can someone help?

[codebudddy]

Simply include the 'payable' key word like so and you should be good to go.

 function fund() public payable {
        // payable change the function to be able to get currency
        // Want to be able to set a minimum amount of ETH
        // 1. How do we send ETH to this co
        require(msg.value.getConversionRate() >= MINIMUM_USD, "Did not send enough"); // // 1e18 == 1 * 10 ** 18
        funders.push(msg.sender); // 
        addressToAmountFunded[msg.sender] += msg.value; //  
    }

[3obby]

For Practice:

function oldWay() public pure returns (uint8){
        uint8 num = 255;
        unchecked{num = num+1;}
        return num;
    }

Is there any reason to use unchecked{} nowadays? The only use case I can think of is a hacky way to intentionally overflow as an alternative to resetting a value manually.

[rashidulhaq-coding]

For practicing question formatting

function addPerson(string memory _name) public{
        people.push(People(_favoriteNumber,_name));
        nameToFavouriteNumber[_name]=_favoriteNumber;
}

Hey, i ran into an error and it says:

DeclarationError: Undeclared identifier. Did you mean "favouriteNumber"?
  --> js_course/SimpleStorage.sol:27:28:

Looking forward for answers, Thanks!

[rashidulhaq-coding]

Practicing answer formatting

Hey you forgot to pass uint256 _favouriteNumber to your function.

function addPerson(string memory _name, uint256 _favoriteNumber) public{
        people.push(People(_favoriteNumber,_name));
        nameToFavouriteNumber[_name]=_favoriteNumber;
    }

Hope that my answer will help you.

[seanmac-dev]

For practice only

pragma solidity 0.8.0;

On this solidity version I'm running into an error:

ParserError: Source file requires different compiler version (current compiler is 0.8.13+commit.abaa5c0e.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version
 --> contracts/PriceConverter.sol:2:1:

Can someone provide assistance?