crowdsale contract on my Ethereum Wallet for windows

Question

I first created a token without difficulty with Ethereum Wallet can be see here: https://etherscan.io/address/0x926351469a1a97Ca5AB9b80928a0Ba01493d39F9#readContract.

Now I'm trying to do a crowdsale contract with the code that I have find on this link https://www.ethereum.org/crowdsale

But I can't see on the right column of My Ethereum Wallet the "Select contract to deploy" option.

it says No visibility specified. Defaulting to "public". function transfer(address receiver, uint amount); ^-----------------------------------------------^,

I guess I got it wrong, I'm not a developer or coder, but curious to learn.

Can someone tell me what did I do wrong ?

Thanks,

Benj

Answer 1

That's a warning, not an error. It's informing you that if you don't explicitly state the visibility of a function, it defaults to public.

You can get rid of the warning by being explicit:

function transfer(address receiver, uint amount) public;