event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
function decimals() external view
returns(uint8)
function totalSupply() external view
returns(uint256)
function balanceOf(address _owner) external view
returns(uint256)
function allowance(address _owner, address _spender) external view
returns(uint256)
function transfer(address _to, uint256 _value) external nonpayable
returns(bool)
function transferFrom(address _from, address _to, uint256 _value) external nonpayable
returns(bool)
function approve(address _spender, uint256 _value) external nonpayable
returns(bool)
function decreaseApproval(address _spender, uint256 _subtractedValue) external nonpayable
returns(bool)
function increaseApproval(address _spender, uint256 _addedValue) external nonpayable
returns(bool)