pragma solidity ^0.6.10;

/**
 * Math operations with safety checks
 */
contract SafeMath {
  function safeMul(uint256 a, uint256 b) internal returns (uint256) {
    uint256 c = a * b;
    require(a == 0 || c / a == b);
    return c;
  }

  function safeDiv(uint256 a, uint256 b) internal returns (uint256) {
    require(b > 0);
    uint256 c = a / b;
    require(a == b * c + a % b);
    return c;
  }

  function safeSub(uint256 a, uint256 b) internal returns (uint256) {
    require(b <= a);
    return a - b;
  }

  function safeAdd(uint256 a, uint256 b) internal returns (uint256) {
    uint256 c = a + b;
    require(c>=a && c>=b);
    return c;
  }
}

contract Ownable {
    
    address public owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    modifier onlyOwner() {
        require(owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        address oldOwner = owner;
        owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

}
contract DECE is SafeMath, Ownable {
    string public name = "DECE";
    string public symbol = "DECE";
    uint8 public decimals = 18;
    uint256 public totalSupply = 1000000000 * (10 ** 18);

    /* This creates an array with all balances */
    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance;

    /* This generates a public event on the blockchain that will notify clients */
    event Transfer(address indexed from, address indexed to, uint256 value);
    
    /* Initializes contract with initial supply tokens to the creator of the contract */
    constructor(address _owner) public {
        owner =   _owner;
        balanceOf[owner] = totalSupply;             
    }
    
    /* Fix for the ERC20 short address attack.*/
    modifier onlyPayloadSize(uint size) {
        require(!(msg.data.length < size + 4));
        _;
    }
    
    /* Allow another contract to spend some tokens in your behalf */
    function approve(address _spender, uint256 _value) public returns (bool success) {
        require(_value > 0); 
        allowance[msg.sender][_spender] = _value;
        return true;
    }

    /* Send coins */
    function transfer(address _to, uint256 _value) public onlyPayloadSize(2 * 32) returns (bool) {
        require(_value > 0); 
        require(balanceOf[msg.sender] >= _value);           // Check if the sender has enough
        require(balanceOf[_to] + _value >= balanceOf[_to]); // Check for overflows
       
        balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value);                     // Subtract from the sender
        balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value);                            // Add the same to the recipient
        emit Transfer(msg.sender, _to, _value);                   // Notify anyone listening that this transfer took place
        return true;
    }

    /* A contract attempts to get the coins */
    function transferFrom(address _from, address _to, uint256 _value) public onlyPayloadSize(3 * 32) returns  (bool) {
        require(_value > 0); 
        require(balanceOf[_from] >= _value);                 // Check if the sender has enough
        require(balanceOf[_to] + _value >= balanceOf[_to]);  // Check for overflows
        require(_value <= allowance[_from][msg.sender]);     // Check allowance
        
        balanceOf[_from] = SafeMath.safeSub(balanceOf[_from], _value);                           // Subtract from the sender
        balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value);                             // Add the same to the recipient
        allowance[_from][msg.sender] = SafeMath.safeSub(allowance[_from][msg.sender], _value);
        emit Transfer(_from, _to, _value);
        return true;
    }
}

{
  "compilationTarget": {
    "contracts/dece.sol": "DECE"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}