// SPDX-License-Identifier: MIT

pragma solidity 0.8.0;

/**
 * @dev Standard interface for ZXC smart contact..
 */
interface Zxc { // ERC20

   /**
   * @dev Returns the name of the token.
   */
  function name()
    external
    view
    returns (string memory _name);

  /**
   * @dev Returns the symbol of the token.
   */
  function symbol()
    external
    view
    returns (string memory _symbol);

  /**
   * @dev Returns the number of decimals the token uses.
   */
  function decimals()
    external
    view
    returns (uint8 _decimals);

  /**
   * @dev Returns the total token supply.
   */
  function totalSupply()
    external
    view
    returns (uint256 _totalSupply);

  /**
   * @dev Returns the account balance of another account with address _owner.
   * @param _owner The address from which the balance will be retrieved.
   */
  function balanceOf(
    address _owner
  )
    external
    view
    returns (uint256 _balance);

  /**
   * @dev Transfers _value amount of tokens to address _to, and MUST fire the Transfer event. The
   * function SHOULD throw if the _from account balance does not have enough tokens to spend.
   * @param _to The address of the recipient.
   * @param _value The amount of token to be transferred.
   */
  function transfer(
    address _to,
    uint256 _value
  )
    external
    returns (bool _success);

  /**
   * @dev Transfers _value amount of tokens from address _from to address _to, and MUST fire the
   * Transfer event.
   * @param _from The address of the sender.
   * @param _to The address of the recipient.
   * @param _value The amount of token to be transferred.
   */
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    external
    returns (bool _success);

  /**
   * @dev Allows _spender to withdraw from your account multiple times, up to
   * the _value amount. If this function is called again it overwrites the current
   * allowance with _value.
   * @param _spender The address of the account able to transfer the tokens.
   * @param _value The amount of tokens to be approved for transfer.
   */
  function approve(
    address _spender,
    uint256 _value
  )
    external
    returns (bool _success);

  /**
   * @dev Returns the amount which _spender is still allowed to withdraw from _owner.
   * @param _owner The address of the account owning tokens.
   * @param _spender The address of the account able to transfer the tokens.
   */
  function allowance(
    address _owner,
    address _spender
  )
    external
    view
    returns (uint256 _remaining);

  /**
   * @dev Allows the current owner to give new owner ability to claim the ownership of the contract.
   * This differs from the Owner's function in that it allows setting pedingOwner address to 0x0,
   * which effectively cancels an active claim.
   * @param _newOwner The address which can claim ownership of the contract.
   */
  function transferOwnership(
    address _newOwner
  )
    external;

  /**
   * @dev Allows the current pending owner to claim the ownership of the contract. It emits
   * OwnershipTransferred event and resets pending owner to 0.
   */
  function claimOwnership()
    external;

  /**
   * @dev Enables token transfers.
   */
  function enableTransfer()
    external;

  /**
   * @dev Burns a specific amount of tokens. This function is based on BurnableToken implementation
   * at goo.gl/GZEhaq.
   * @notice Only owner is allowed to perform this operation.
   * @param _value The amount of tokens to be burned.
   */
  function burn(
    uint256 _value
  )
    external;

  /**
   * @dev Set crowdsale address which can distribute tokens even when onlyWhenTransferAllowed is
   * false.
   * @param crowdsaleAddr Address of token offering contract.
   */
  function setCrowdsaleAddress(
    address crowdsaleAddr
  )
    external;

  /**
   * @dev Triggers when tokens are transferred, including zero value transfers.
   */
  event Transfer(
    address indexed _from,
    address indexed _to,
    uint256 _value
  );

  /**
   * @dev Triggers on any successful call to approve(address _spender, uint256 _value).
   */
  event Approval(
    address indexed _owner,
    address indexed _spender,
    uint256 _value
  );

   /**
   * @dev An event which is triggered when tokens are burned.
   * @param _burner The address which burns tokens.
   * @param _value The amount of burned tokens.
   */
  event Burn(
    address indexed _burner,
    uint256 _value
  );

}