this is all the contract code
pragma solidity ^0.4.18;
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }
contract TokenERC20 {
// 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;
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);
/**
* Constrctor function
*
* Initializes contract with initial supply tokens to the creator of the contract
*/
function TokenERC20(uint256 initialSupply , string tokenName , string tokenSymbol) public {
totalSupply assign = 250000000 ** uint256(18); // Update total supply with the decimal amount
balanceOf[msg.sender] assign = totalSupply; // Give the creator all initial tokens
name assign = "PONTEM"; // Set the name for display purposes
symbol assign = "PXM"; // Set the symbol for display purposes
}
/**
* Internal transfer, only can be called by this contract
*/
/**
* 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
require(!frozenAccount[_from]); // Check if sender is frozen
require(!frozenAccount[_to]); // Check if recipient is frozen
balanceOf[_from] -= _value;
// Add the same to the recipient
balanceOf[_to] += _value;
emit 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);
require(!frozenAccount[msg.sender]);
}
/**
* Transfer tokens from other address
*
* 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) public returns (bool success) {
require(_value <= allowance[_from][msg.sender]); // Check allowance
allowance[_from][msg.sender] -= _value;
_transfer(_from, _to, _value);
return true;
}
/**
* Set allowance for other address
*
* 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) public
returns (bool success) {
allowance[msg.sender][_spender] = _value;
return true;
}
/**
* Set allowance for other address and notify
*
* 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)
public
returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}
/**
* Destroy tokens
*
* Remove `_value` tokens from the system irreversibly
*
* @param _value the amount of money to burn
*/
function burn(uint256 _value) public 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
emit Burn(msg.sender, _value);
return true;
}
/**
* Destroy tokens from other account
*
* Remove `_value` tokens from the system irreversibly on behalf of `_from`.
*
* @param _from the address of the sender
* @param _value the amount of money to burn
*/
function burnFrom(address _from, uint256 _value) public 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
emit Burn(_from, _value);
return true;
} mapping (address => bool) public frozenAccount;
event FrozenFunds(address target, bool frozen);
function freezeAccount(address target, bool freeze) public {
frozenAccount[target] = freeze;
emit FrozenFunds(target, freeze);
} uint256 public sellPrice;
uint256 public buyPrice;
function setPrices(uint256 newSellPrice, uint256 newBuyPrice) public {
sellPrice = newSellPrice;
buyPrice = newBuyPrice;
}/// @notice Buy tokens from contract by sending ether
function buy() payable public returns(uint amount) {
amount = msg.value / buyPrice; // calculates the amount
require(balanceOf[this] >= amount); // checks if it has enough to sell
require(balanceOf[msg.sender] >= amount * buyPrice); // checks if sender has enough ether to buy
balanceOf[msg.sender] += amount; // adds the amount to buyer's balance
balanceOf[this] -= amount; // subtracts amount from seller's balance
_transfer(this, msg.sender, amount); // makes the transfers
return amount;
}
/// @notice Sell `amount` tokens to contract
/// @param amount amount of tokens to be sold
function sell(uint256 amount) public returns(uint revenue) {
require(this.balance >= amount * sellPrice); // checks if the contract has enough ether to buy
require(balanceOf[msg.sender] >= amount); // checks if it has enough to sell
balanceOf[this] += amount; // adds the amount to buyer's balance
balanceOf[msg.sender] -= amount; // subtracts amount from seller's balance
revenue = amount * sellPrice;
_transfer(msg.sender, this, amount); // makes the transfers
require(msg.sender.send(revenue)); // sends ether to the seller: it's important to do this last to prevent recursion attacks
return revenue;
}
}
the new errors are this
error 1:
Warning: Defining constructors as functions with the same name as the contract is deprecated. Use "constructor(...) { ... }" instead.
function TokenERC20(uint256 initialSupply , string tokenName , string tokenSymbol) public {
error2:
browser/ballot.sol:30:9: The previous declaration is here:
totalSupply assign = 250000000 ** uint256(18); // Update total supply with the decimal amount
^----------------^
browser/ballot.sol:31:9: TypeError: Name has to refer to a struct, enum or contract.
balanceOf[msg.sender] assign = totalSupply;// Give the creator all initial tokens
^-------^
browser/ballot.sol:32:9: DeclarationError: Identifier already declared.
name assign = "PONTEM"; // Set the name for display purposes
^---------^
browser/ballot.sol:33:9: DeclarationError: Identifier already declared.
symbol assign = "PXM";// Set the symbol for display purposes
^-----------^
pragma solidity ^version? Is your function wrapped within a contract?