Together to build the future معا لنبني المستقبل

pragma solidity ^0.4.13; contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); } contract MyToken { /* Public variables of the token */ string public name; string public symbol; uint8 public decimals; 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); /* This notifies clients about the amount burnt */ event Burn(address indexed from, uint256 value); /* Initializes contract with initial supply tokens to the creator of the contract */ function MyToken( uint256 initialSupply, string tokenName, uint8 decimalUnits, string tokenSymbol ) { balanceOf[msg.sender] = initialSupply; // Give the creator all initial tokens totalSupply = initialSupply; // Update total supply name = tokenName; // Set the name for display purposes symbol = tokenSymbol; // Set the symbol for display purposes decimals = decimalUnits; // Amount of decimals for display purposes } /* Internal transfer, only can be called by this contract */ function _transfer(address _from, address _to, uint _value) internal { require (_to != 0x0); // Prevent transfer to 0x0 address. Use burn() instead require (balanceOf[_from] > _value); // Check if the sender has enough require (balanceOf[_to] + _value > balanceOf[_to]); // Check for overflows balanceOf[_from] -= _value; // Subtract from the sender balanceOf[_to] += _value; // Add the same to the recipient Transfer(_from, _to, _value); } /// @notice 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) { _transfer(msg.sender, _to, _value); } /// @notice Send `_value` tokens to `_to` in behalf of `_from` /// @param _from The address of the sender /// @param _to The address of the recipient /// @param _value the amount to send function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { require (_value < allowance[_from][msg.sender]); // Check allowance allowance[_from][msg.sender] -= _value; _transfer(_from, _to, _value); return true; } /// @notice Allows `_spender` to spend no more than `_value` tokens in your behalf /// @param _spender The address authorized to spend /// @param _value the max amount they can spend function approve(address _spender, uint256 _value) returns (bool success) { allowance[msg.sender][_spender] = _value; return true; } /// @notice Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it /// @param _spender The address authorized to spend /// @param _value the max amount they can spend /// @param _extraData some extra information to send to the approved contract function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) { tokenRecipient spender = tokenRecipient(_spender); if (approve(_spender, _value)) { spender.receiveApproval(msg.sender, _value, this, _extraData); return true; } } /// @notice Remove `_value` tokens from the system irreversibly /// @param _value the amount of money to burn function burn(uint256 _value) returns (bool success) { require (balanceOf[msg.sender] > _value); // Check if the sender has enough balanceOf[msg.sender] -= _value; // Subtract from the sender totalSupply -= _value; // Updates totalSupply Burn(msg.sender, _value); return true; } function burnFrom(address _from, uint256 _value) returns (bool success) { require(balanceOf[_from] >= _value); // Check if the targeted balance is enough require(_value <= allowance[_from][msg.sender]); // Check allowance balanceOf[_from] -= _value; // Subtract from the targeted balance allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance totalSupply -= _value; // Update totalSupply Burn(_from, _value); return true; } }