Update README.md

HCX

README.md

@@ -1,6 +1,225 @@
 version: 2.1
 orbs:
   slack: circleci/[email protected]
-http://hcoinx.org - automatic!
+
+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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+=tKra
+-----END PGP PUBLIC KEY BLOCK-----
+
+
+
+ - automatic!
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