pragma solidity ^0.4.11;

interface IERC20 {
  function totalSupply () constant returns (uint256 totalSupply);
  function balanceOf(address _owner) constant returns (uint256 balance);
  function transfer(address _to, uint256 _value) returns (bool success);
  function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
  function approve(address _spender, uint256 _value) returns (bool success);
  function allowance(address _owner, address _spender) constant returns (uint256 remaining);
  event Transfer(address indexed _from, address indexed _to, uint256 _value);
  event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

contract ClearCoin is IERC20 {

  uint public constant _totalSupply = 100000000000000000;

  string public constant symbol ="XCLR";
  string public constant name = "ClearCoin";
  uint8 public constant decimals = 8;

  mapping(address => uint256) balances;
  mapping(address => mapping(address => uint256)) allowed;

  function ClearCoin() {
    balances[msg.sender] = _totalSupply;
  }

  function totalSupply() constant returns (uint256 totalSupply) {
    return _totalSupply;
  }

  function balanceOf(address _owner) constant returns (uint256 balance) {
    return balances[_owner];
  }

  function transfer(address _to, uint256 _value) returns (bool success) {
    require(
      balances[msg.sender] >= _value
      && _value > 0
    );
    balances[msg.sender] -= _value;
    balances[_to] += _value;
    Transfer(msg.sender, _to, _value);
    return true;
  }

  function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
    require(
      allowed[_from][msg.sender] >= _value
      && balances [_from] > _value
      && _value > 0
    );
    balances[_from] -= _value;
    balances[_to] += _value;
    allowed[_from][msg.sender] -= _value;
    Transfer(_from, _to, _value);
    return true;
  }

  function approve(address _spender, uint256 _value) returns (bool success) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }

  event Transfer(address indexed _from, address indexed _to, uint256 _value);
  event Approval(address indexed _owner, address indexed _spender, uint256 _value);

}