// Returns the name of the token.
function name() public view returns (string)
// Returns the symbol of the token, usually a shorter version of the name.
function symbol() public view returns (string)
// There is no floats in Solidity. Token usually adopt the standard of 18 decimals to mimic the relationship between Ether and Wei.
function decimals() public view returns (uint8)
// Returns the amount of tokens in existence.
function totalSupply() public view returns (uint256)
// Returns the amount of tokens owned by an address (account).
function balanceOf(address _owner) public view returns (uint256 balance)
// The ERC-20 standard allow an address to give an allowance to another address to be able to retrieve tokens from it.
// This getter returns the remaining number of tokens that the spender will be allowed to spend on behalf of owner.
function allowance(address _owner, address _spender) public view returns (uint256 remaining)
// Moves the amount of tokens from the function caller address (msg.sender) to the recipient address.
function transfer(address _to, uint256 _value) public returns (bool success)
// Moves the amount of tokens from sender to recipient using the allowance mechanism. amount is then deducted from the caller's allowance.
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success)
// Set the amount of allowance the spender is allowed to transfer from the function caller (msg.sender) balance.
function approve(address _spender, uint256 _value) public returns (bool success)

event Transfer(address indexed _from, address indexed _to, uint256 _value)
event Approval(address indexed _owner, address indexed _spender, uint256 _value)