2

I'd like to declare a string value more than 20 bytes in Solidity. I use address type, but it only contains 20bytes. Could you tell me how to solve the problem?

3

There are bytes and string types. See Solidity docs:

bytes:
Dynamically-sized byte array, see Arrays. Not a value-type!
string:
Dynamically-sized UTF8-encoded string, see Arrays. Not a value-type!

As a rule of thumb, use bytes for arbitrary-length raw byte data and string for arbitrary-length string (utf-8) data. If you can limit the length to a certain number of bytes, always use one of bytes1 to bytes32 because they are much cheaper.

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