Can smart contract have token balance

Question

There are two accounts in ethererum: The Externally owned accounts (EOAs) and Contract accounts .

EOA's can have balance of ether and tokens . smart contract can have balance of ether, but can they have balance of tokens? I have created ERC 20 token , can i send this tokens to other smart contract?

Answer 1

Smart contracts can receive and send tokens just like normal accounts.

There is mapping which is usually called balances in token smart contract (ERC20). It looks like address => uint balance where address has the same format both for account and smart contract addresses (basicaly address is just a sequence of 20 bytes in hexadecimal; P.S. format is the same, but the way they are calculated is different!). in ERC20 basic token there already is function balanceOf(address _owner). It returns balances[_owner]