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

I am doing a criptoCoin and I am using Solidity. I have an issue when create a crowdsale on function transfer(address receiver, uint amount); } the compile said No visibility specified. Defaulting to "public". function transfer(address receiver, uint amount); ^-----------------------------------------------^\

Solution

  • There's nothing necessarily wrong with your code - the compiler is just warning you that you didn't specify a visibility scope, and that it'll be defaulting it to public.

    Something like this is probably what you want:

    function transfer(address receiver, uint amount) external {}

    The external keyword just means that the function can only be called from outside the contract - i.e. by other contracts/addresses on the Ethereum network. Other options include public, private, and internal. You can read more about these visibility keywords here.