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- pragma solidity ^0.4.4;
- contract Token {
- /// @return total amount of tokens
- function totalSupply() constant returns (uint256 supply) {}
- /// @param _owner The address from which the balance will be retrieved
- /// @return The balance
- function balanceOf(address _owner) constant returns (uint256 balance) {}
- /// @notice send `_value` token to `_to` from `msg.sender`
- /// @param _to The address of the recipient
- /// @param _value The amount of token to be transferred
- /// @return Whether the transfer was successful or not
- function transfer(address _to, uint256 _value) returns (bool success) {}
- /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
- /// @param _from The address of the sender
- /// @param _to The address of the recipient
- /// @param _value The amount of token to be transferred
- /// @return Whether the transfer was successful or not
- function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}
- /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
- /// @param _spender The address of the account able to transfer the tokens
- /// @param _value The amount of wei to be approved for transfer
- /// @return Whether the approval was successful or not
- function approve(address _spender, uint256 _value) returns (bool success) {}
- /// @param _owner The address of the account owning tokens
- /// @param _spender The address of the account able to transfer the tokens
- /// @return Amount of remaining tokens allowed to spent
- function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}
- event Transfer(address indexed _from, address indexed _to, uint256 _value);
- event Approval(address indexed _owner, address indexed _spender, uint256 _value);
- }
- contract StandardToken is Token {
- function transfer(address _to, uint256 _value) returns (bool success) {
- //Default assumes totalSupply can't be over max (2^256 - 1).
- //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap.
- //Replace the if with this one instead.
- //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
- if (balances[msg.sender] >= _value && _value > 0) {
- balances[msg.sender] -= _value;
- balances[_to] += _value;
- Transfer(msg.sender, _to, _value);
- return true;
- } else { return false; }
- }
- function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
- //same as above. Replace this line with the following if you want to protect against wrapping uints.
- //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
- if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
- balances[_to] += _value;
- balances[_from] -= _value;
- allowed[_from][msg.sender] -= _value;
- Transfer(_from, _to, _value);
- return true;
- } else { return false; }
- }
- function balanceOf(address _owner) constant returns (uint256 balance) {
- return balances[_owner];
- }
- function approve(address _spender, uint256 _value) returns (bool success) {
- allowed[msg.sender][_spender] = _value;
- Approval(msg.sender, _spender, _value);
- return true;
- }
- function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
- return allowed[_owner][_spender];
- }
- mapping (address => uint256) balances;
- mapping (address => mapping (address => uint256)) allowed;
- uint256 public totalSupply;
- }
- contract HashnodeTestCoin is StandardToken { // CHANGE THIS. Update the contract name.
- /* Public variables of the token */
- /*
- NOTE:
- The following variables are OPTIONAL vanities. One does not have to include them.
- They allow one to customise the token contract & in no way influences the core functionality.
- Some wallets/interfaces might not even bother to look at this information.
- */
- string public name; // Token Name
- uint8 public decimals; // How many decimals to show. To be standard complicant keep it 18
- string public symbol; // An identifier: eg SBX, XPR etc..
- string public version = 'H1.0';
- uint256 public unitsOneEthCanBuy; // How many units of your coin can be bought by 1 ETH?
- uint256 public totalEthInWei; // WEI is the smallest unit of ETH (the equivalent of cent in USD or satoshi in BTC). We'll store the total ETH raised via our ICO here.
- address public fundsWallet; // Where should the raised ETH go?
- // This is a constructor function
- // which means the following function name has to match the contract name declared above
- function HashnodeTestCoin() {
- balances[msg.sender] = 1000000000000000000000; // Give the creator all initial tokens. This is set to 1000 for example. If you want your initial tokens to be X and your decimal is 5, set this value to X * 100000. (CHANGE THIS)
- totalSupply = 1000000000000000000000; // Update total supply (1000 for example) (CHANGE THIS)
- name = "HashnodeTestCoin"; // Set the name for display purposes (CHANGE THIS)
- decimals = 18; // Amount of decimals for display purposes (CHANGE THIS)
- symbol = "HTCN"; // Set the symbol for display purposes (CHANGE THIS)
- unitsOneEthCanBuy = 10; // Set the price of your token for the ICO (CHANGE THIS)
- fundsWallet = msg.sender; // The owner of the contract gets ETH
- }
- function() payable{
- totalEthInWei = totalEthInWei + msg.value;
- uint256 amount = msg.value * unitsOneEthCanBuy;
- if (balances[fundsWallet] < amount) {
- return;
- }
- balances[fundsWallet] = balances[fundsWallet] - amount;
- balances[msg.sender] = balances[msg.sender] + amount;
- Transfer(fundsWallet, msg.sender, amount); // Broadcast a message to the blockchain
- //Transfer ether to fundsWallet
- fundsWallet.transfer(msg.value);
- }
- /* Approves and then calls the receiving contract */
- function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
- allowed[msg.sender][_spender] = _value;
- Approval(msg.sender, _spender, _value);
- //call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn't have to include a contract in here just for this.
- //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
- //it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
- if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
- return true;
- }
- }
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