TitanToken.sol

pragma solidity ^0.4.19;
//This contract is Titan Factory templete derivative of ERC20 standard .
contract TitanToken{ 
    // Public variables of the token
    bytes32 public name;
    bytes32 public symbol;
    uint8 public decimals = 18;
    // 18 decimals is the strongly suggested default, avoid changing it
    uint256 public totalSupply;

    // 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);
    event Eventexchangeto(bytes32,bytes32,uint256);
    event Eventexchangefrom(bytes32,bytes32,uint256);
    
    /**
     * Constrctor function
     *
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    function TitanToken(uint256 initialSupply, bytes32 tokenName, bytes32 tokenSymbol) public {
        totalSupply = initialSupply * 10 ** uint256(decimals);  // Update total supply with the decimal amount
        balanceOf[msg.sender] = totalSupply;                // Give the creator all initial tokens
        name = tokenName;                                   // Set the name for display purposes
        symbol = tokenSymbol;                               // Set the symbol for display purposes
    }

    /**
     * Internal transfer, only can be called by this contract
     */
    function _transfer(address _from, address _to, uint _value) internal {
        // Prevent transfer to 0x0 address. Use burn() instead
        require(_to != 0x0);
        // Check if the sender has enough
        require(balanceOf[_from] >= _value);
        // Check for overflows
        require(balanceOf[_to] + _value > balanceOf[_to]);
        // Save this for an assertion in the future
        uint previousBalances = balanceOf[_from] + balanceOf[_to];
        // Subtract from the sender
        balanceOf[_from] -= _value;
        // Add the same to the recipient
        balanceOf[_to] += _value;
        Transfer(_from, _to, _value);
        // Asserts are used to use static analysis to find bugs in your code. They should never fail
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

    /**
     * Transfer tokens
     *
     * Send `_value` tokens to `_to` from your account
     *
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

    
    function exchangeTo(uint256 _value )private {
        balanceOf[msg.sender] += _value;
        Eventexchangeto(name,symbol,_value);
        
    }
    function exchangeFrom(uint256 _value) private{
    balanceOf[msg.sender] -= _value;  
     Eventexchangefrom(name,symbol,_value);
    }
    // uint public constant factor = 10 ;
    //assumed that both token exist for that wallet . To check, use web3js
  
    function exchange( uint256 _value, uint factor)public returns(uint256){
       //passes the value of token from which we are exchanging to another token vaue . exchanged value is returned 
    return _value *= factor;
    }
}