version: 2.1 orbs: slack: circleci/[email protected]
pragma solidity ^0.4.24;
// ---------------------------------------------------------------------------- // Sample token contract // // Symbol : HCX // Name : HCoinx Token // Total supply : 100000000 // Decimals : 2 // Owner Account : 0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe // // Enjoy. // // (c) by Howard L. Mosely Jr. 2020. MIT Licence. // ----------------------------------------------------------------------------
// ---------------------------------------------------------------------------- // Lib: Safe Math // ---------------------------------------------------------------------------- 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;
}
}
/** ERC Token Standard #20 Interface https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md */ contract ERC20Interface { function totalSupply() public constant returns (uint); function balanceOf(address tokenOwner) public constant returns (uint balance); function allowance(address tokenOwner, address spender) public constant 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);
}
/** Contract function to receive approval and execute function in one call Borrowed from MiniMeToken */ contract ApproveAndCallFallBack { function receiveApproval(address from, uint256 tokens, address token, bytes data) public; }
/** ERC20 Token, with the addition of symbol, name and decimals and assisted token transfers */ contract HCoinxToken is ERC20Interface, SafeMath { string public symbol; string public name; uint8 public decimals; uint public _totalSupply;
mapping(address => uint) balances;
mapping(address => mapping(address => uint)) allowed;
//
// ------------------------------------------------------------------------
// Token owner can approve for spender to transferFrom(...) tokens
// from the token owner's account. The spender contract function
// receiveApproval(...) is then executed
// ------------------------------------------------------------------------
function approveAndCall(address spender, uint tokens, bytes data) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
return true;
}
// ------------------------------------------------------------------------
// Don't accept ETH
// ------------------------------------------------------------------------
function () public payable {
revert();
}
} ------------------------------------------------------------------------ // Constructor // ------------------------------------------------------------------------ constructor() public { symbol = "HCX"; name = "HCoinx Token"; decimals = 2; _totalSupply = 100000; balances[0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe] = _totalSupply; emit Transfer(address(0), 0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe, _totalSupply); }
// ------------------------------------------------------------------------
// Total supply
// ------------------------------------------------------------------------
function totalSupply() public constant returns (uint) {
return _totalSupply - balances[address(0)];
}
// ------------------------------------------------------------------------
// Get the token balance for account tokenOwner
// ------------------------------------------------------------------------
function balanceOf(address tokenOwner) public constant returns (uint balance) {
return balances[tokenOwner];
}
// ------------------------------------------------------------------------
// Transfer the balance from token owner's account to to account
// - Owner's account must have sufficient balance to transfer
// - 0 value transfers are allowed
// ------------------------------------------------------------------------
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;
}
// ------------------------------------------------------------------------
// Token owner can approve for spender to transferFrom(...) tokens
// from the token owner's account
//
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
// recommends that there are no checks for the approval double-spend attack
// as this should be implemented in user interfaces
// ------------------------------------------------------------------------
function approve(address spender, uint tokens) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
return true;
}
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