pragma solidity ^0.4.20;

contract PictureLibraryCoin {

	// Public variables of the token
	string public name;
	string 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;

	// This generates a public event on the blockchain that will notify clients
    event Transfer(address indexed from, address indexed to, uint256 value);

	/**
     * Constrctor function
     *
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    function PictureLibraryCoin (
        uint256 initialSupply
        ) public {
		    totalSupply = initialSupply * 10 ** uint256(decimals);  // Update total supply with the decimal amount
			balanceOf[msg.sender] = totalSupply;                // Give the creator all initial tokens
			name = "PictureLibraryCoin";                                   // Set the name for display purposes
			symbol = "PLC";                               // 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);
    }
}