deployed smart contract

OFNOG.sol

@@ -0,0 +1,144 @@
+pragma solidity 0.4.21;
+
+/**
+ * @title SafeMath
+ * @dev Math operations with safety checks that throw on error
+ */
+library SafeMath {
+  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
+    if (a == 0) {
+      return 0;
+    }
+    uint256 c = a * b;
+    assert(c / a == b);
+    return c;
+  }
+
+  function div(uint256 a, uint256 b) internal pure returns (uint256) {
+    // assert(b > 0); // Solidity automatically throws when dividing by 0
+    uint256 c = a / b;
+    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
+    return c;
+  }
+
+  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
+    assert(b <= a);
+    return a - b;
+  }
+
+  function add(uint256 a, uint256 b) internal pure returns (uint256) {
+    uint256 c = a + b;
+    assert(c >= a);
+    return c;
+  }
+}
+
+contract ERC20 {
+    function totalSupply()public view returns (uint total_Supply);
+    function balanceOf(address _owner)public view returns (uint256 balance);
+    function allowance(address _owner, address _spender)public view returns (uint remaining);
+    function transferFrom(address _from, address _to, uint _amount)public returns (bool ok);
+    function approve(address _spender, uint _amount)public returns (bool ok);
+    function transfer(address _to, uint _amount)public returns (bool ok);
+    event Transfer(address indexed _from, address indexed _to, uint _amount);
+    event Approval(address indexed _owner, address indexed _spender, uint _amount);
+}
+
+
+contract OFNOG is ERC20
+{   
+    using SafeMath for uint256;
+    string public constant symbol = "OFNOG";
+    string public constant name = "OFNOG";
+    uint public constant decimals = 18;
+    uint256 public _totalSupply = 500000000 * 10 ** 18; // 500 Million Total Supply including 18 decimal
+
+     // Owner of this contract
+    address public owner;
+
+    // Balances for each account
+    mapping(address => uint256) balances;
+
+     // Owner of account approves the transfer of an amount to another account
+    mapping(address => mapping (address => uint256)) allowed;
+
+     // Functions with this modifier can only be executed by the owner
+    modifier onlyOwner() {
+        require (msg.sender == owner);
+        _;
+    }
+
+     // Constructor
+    function OFNOG () public {
+        owner = msg.sender;
+        balances[owner] = _totalSupply;
+        emit Transfer(0, owner, _totalSupply);
+    }
+
+   //Burning tokens
+    function burntokens(uint256 tokens) external onlyOwner {
+        require( tokens <= balances[owner]);
+        _totalSupply = (_totalSupply).sub(tokens);
+        balances[owner] = balances[owner].sub(tokens);
+        emit Transfer(owner, 0, tokens);
+    }
+
+    // what is the total supply of the ech tokens
+    function totalSupply() public view returns (uint256 total_Supply) {
+        total_Supply = _totalSupply;
+    }
+       // What is the balance of a particular account?
+    function balanceOf(address _owner)public view returns (uint256 balance) {
+        return balances[_owner];
+    }
+
+     // Transfer the balance from owner's account to another account
+    function transfer(address _to, uint256 _amount)public returns (bool ok) {
+        require( _to != 0x0);
+        require(balances[msg.sender] >= _amount && _amount >= 0);
+        balances[msg.sender] = (balances[msg.sender]).sub(_amount);
+        balances[_to] = (balances[_to]).add(_amount);
+        emit Transfer(msg.sender, _to, _amount);
+        return true;
+    }
+
+    // Send _value amount of tokens from address _from to address _to
+     // The transferFrom method is used for a withdraw workflow, allowing contracts to send
+     // tokens on your behalf, for example to "deposit" to a contract address and/or to charge
+     // fees in sub-currencies; the command should fail unless the _from account has
+     // deliberately authorized the sender of the message via some mechanism; we propose
+     // these standardized APIs for approval:
+    function transferFrom( address _from, address _to, uint256 _amount )public returns (bool ok) {
+        require( _to != 0x0);
+        require(balances[_from] >= _amount && allowed[_from][msg.sender] >= _amount && _amount >= 0);
+        balances[_from] = (balances[_from]).sub(_amount);
+        allowed[_from][msg.sender] = (allowed[_from][msg.sender]).sub(_amount);
+        balances[_to] = (balances[_to]).add(_amount);
+        emit Transfer(_from, _to, _amount);
+        return true;
+    }
+
+     // Allow _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.
+    function approve(address _spender, uint256 _amount)public returns (bool ok) {
+        require( _spender != 0x0);
+        allowed[msg.sender][_spender] = _amount;
+        emit Approval(msg.sender, _spender, _amount);
+        return true;
+    }
+
+    function allowance(address _owner, address _spender)public view returns (uint256 remaining) {
+        require( _owner != 0x0 && _spender !=0x0);
+        return allowed[_owner][_spender];
+    }
+
+    //In case the ownership needs to be transferred
+	function transferOwnership(address newOwner) external onlyOwner
+	{
+	    require( newOwner != 0x0);
+	    balances[newOwner] = (balances[newOwner]).add(balances[owner]);
+	    balances[owner] = 0;
+	    owner = newOwner;
+	    emit Transfer(msg.sender, newOwner, balances[newOwner]);
+	}
+}