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wenjoy/bad-token.sol

Created August 9, 2022 09:25
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  1. wenjoy created this gist Aug 9, 2022.
    100 changes: 100 additions & 0 deletions bad-token.sol
    View file
    Original file line number Diff line number Diff line change
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    // SPDX-License-Identifier: GPL-3.0

    pragma solidity >=0.7.0 <0.9.0;

    contract WorldToken {

    uint256 _totalSupply;
    address payable owner;
    mapping(address => uint256) balances;
    mapping(address => mapping(address => uint256)) allowed;
    string public name;
    string public symbol;

    constructor(uint256 totalSupply) {

    _totalSupply = totalSupply;

    owner = payable(msg.sender);

    balances[msg.sender] = _totalSupply;

    name = "WorldToken";

    symbol = "WOT";

    }

    function totalSupply() public view returns (uint256) {
    return _totalSupply;
    }

    function balanceOf(address _owner) public view returns

    (uint256 balance) {
    return balances[_owner];
    }

    function transfer(address _to, uint256 _value) public

    returns (bool success) {
    require(_value <= balances[msg.sender]);
    balances[msg.sender] = balances[msg.sender] - _value;
    balances[_to] = balances[_to] + _value;
    emit Transfer(msg.sender, _to, _value);
    return true;
    }

    function transferFrom(address _from, address _to, uint256

    _value) public returns (bool success) {
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);
    balances[_from] = balances[_from] - _value;
    allowed[_from][msg.sender] = allowed[_from][msg.sender] - _value;
    balances[_to] = balances[_to] + _value;
    emit Transfer(_from, _to, _value);
    return true;
    }

    function approve(address _spender, uint256 _value) public

    returns (bool success) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender] + _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
    }

    function allowance(address _owner, address _spender)

    public view returns (uint256 remaining) {
    return allowed[_owner][_spender];
    }

    function buyTokens() public payable returns (bool success) {
    require(msg.value > 0);
    uint256 num_of_tokens = ((msg.value / 1000000000000000000) * 10);
    balances[msg.sender] = balances[msg.sender] + num_of_tokens;
    balances[owner] = balances[owner] - num_of_tokens;
    owner.transfer(msg.value);
    return true;
    }

    // what is purpose of this function?
    function recieve() public payable {
    require(msg.value > 0);
    uint256 num_of_tokens = ((msg.value / 1000000000000000000) * 10);
    balances[msg.sender] = balances[msg.sender] + num_of_tokens;
    balances[owner] = balances[owner] - num_of_tokens;
    owner.transfer(msg.value);
    }

    event Transfer(address indexed _from, address indexed

    _to, uint256 _value);

    event Approval(address indexed _owner, address indexed

    _spender, uint256 _value);

    }