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February 17, 2021 13:22
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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.5.0+commit.1d4f565a.js&optimize=false&runs=200&gist=
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pragma solidity ^0.5.0; | |
// ---------------------------------------------------------------------------- | |
// ERC Token Standard #20 Interface | |
// | |
// ---------------------------------------------------------------------------- | |
contract ERC20Interface { | |
function totalSupply() public view returns (uint); | |
function balanceOf(address tokenOwner) public view returns (uint balance); | |
function allowance(address tokenOwner, address spender) public view returns (uint remaining); | |
function transfer(address to, uint tokens) public returns (bool success); | |
function approve(address spender, uint tokens) public returns (bool success); | |
function transferFrom(address from, address to, uint tokens) public returns (bool success); | |
event Transfer(address indexed from, address indexed to, uint tokens); | |
event Approval(address indexed tokenOwner, address indexed spender, uint tokens); | |
} | |
// ---------------------------------------------------------------------------- | |
// Safe Math Library | |
// ---------------------------------------------------------------------------- | |
contract SafeMath { | |
function safeAdd(uint a, uint b) public pure returns (uint c) { | |
c = a + b; | |
require(c >= a); | |
} | |
function safeSub(uint a, uint b) public pure returns (uint c) { | |
require(b <= a); c = a - b; } function safeMul(uint a, uint b) public pure returns (uint c) { c = a * b; require(a == 0 || c / a == b); } function safeDiv(uint a, uint b) public pure returns (uint c) { require(b > 0); | |
c = a / b; | |
} | |
} | |
contract EdwardTayToken is ERC20Interface, SafeMath { | |
string public name; | |
string public symbol; | |
uint8 public decimals; // 18 decimals is the strongly suggested default, avoid changing it | |
uint256 public _totalSupply; | |
mapping(address => uint) balances; | |
mapping(address => mapping(address => uint)) allowed; | |
/** | |
* Constrctor function | |
* | |
* Initializes contract with initial supply tokens to the creator of the contract | |
*/ | |
constructor() public { | |
name = "EdwardTayToken"; | |
symbol = "ET"; | |
decimals = 0; | |
_totalSupply = 21000000; | |
balances[msg.sender] = _totalSupply; | |
emit Transfer(address(0), msg.sender, _totalSupply); | |
} | |
function totalSupply() public view returns (uint) { | |
return _totalSupply - balances[address(0)]; | |
} | |
function balanceOf(address tokenOwner) public view returns (uint balance) { | |
return balances[tokenOwner]; | |
} | |
function allowance(address tokenOwner, address spender) public view returns (uint remaining) { | |
return allowed[tokenOwner][spender]; | |
} | |
function approve(address spender, uint tokens) public returns (bool success) { | |
allowed[msg.sender][spender] = tokens; | |
emit Approval(msg.sender, spender, tokens); | |
return true; | |
} | |
function transfer(address to, uint tokens) public returns (bool success) { | |
balances[msg.sender] = safeSub(balances[msg.sender], tokens); | |
balances[to] = safeAdd(balances[to], tokens); | |
emit Transfer(msg.sender, to, tokens); | |
return true; | |
} | |
function transferFrom(address from, address to, uint tokens) public returns (bool success) { | |
balances[from] = safeSub(balances[from], tokens); | |
allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens); | |
balances[to] = safeAdd(balances[to], tokens); | |
emit Transfer(from, to, tokens); | |
return true; | |
} | |
} |
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