Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Basic ERC20 implementation
pragma solidity ^0.4.19;
contract ERC20Basic {
string public constant name = "ERC20Basic";
string public constant symbol = "BSC";
uint8 public constant decimals = 18;
event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
event Transfer(address indexed from, address indexed to, uint tokens);
mapping(address => uint256) balances;
mapping(address => mapping (address => uint256)) allowed;
uint256 totalSupply_;
using SafeMath for uint256;
constructor(uint256 total) public {
totalSupply_ = total;
balances[msg.sender] = totalSupply_;
}
function totalSupply() public view returns (uint256) {
return totalSupply_;
}
function balanceOf(address tokenOwner) public view returns (uint) {
return balances[tokenOwner];
}
function transfer(address receiver, uint numTokens) public returns (bool) {
require(numTokens <= balances[msg.sender]);
balances[msg.sender] = balances[msg.sender].sub(numTokens);
balances[receiver] = balances[receiver].add(numTokens);
emit Transfer(msg.sender, receiver, numTokens);
return true;
}
function approve(address delegate, uint numTokens) public returns (bool) {
allowed[msg.sender][delegate] = numTokens;
Approval(msg.sender, delegate, numTokens);
return true;
}
function allowance(address owner, address delegate) public view returns (uint) {
return allowed[owner][delegate];
}
function transferFrom(address owner, address buyer, uint numTokens) public returns (bool) {
require(numTokens <= balances[owner]);
require(numTokens <= allowed[owner][msg.sender]);
balances[owner] = balances[owner].sub(numTokens);
allowed[owner][msg.sender] = allowed[owner][msg.sender].sub(numTokens);
balances[buyer] = balances[buyer].add(numTokens);
Transfer(owner, buyer, numTokens);
return true;
}
}
library SafeMath {
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
@Dinslinger90

This comment has been minimized.

Copy link

@Dinslinger90 Dinslinger90 commented Aug 9, 2019

Gotta change

  1. line no 46
    https://gist.github.com/giladHaimov/8e81dbde10c9aeff69a1d683ed6870be#file-basicerc20-sol-L46
    emit Approval(msg.sender, delegate, numTokens);
  2. line no 61
    https://gist.github.com/giladHaimov/8e81dbde10c9aeff69a1d683ed6870be#file-basicerc20-sol-L61
  3. line no 1
    pragma solidity ^0.4.19; -> This version doen't work.
    advised one -> pragma solidity >=0.4.22 <0.6.0;
    Thanks 👍
@SirPhemmiey

This comment has been minimized.

Copy link

@SirPhemmiey SirPhemmiey commented Nov 11, 2019

Great suggestions @Dinslinger90

@overlander011

This comment has been minimized.

Copy link

@overlander011 overlander011 commented Oct 21, 2020

How to call ERC20 contract for tranfer to another contract ,Thank you

@SirPhemmiey

This comment has been minimized.

Copy link

@SirPhemmiey SirPhemmiey commented Oct 21, 2020

do you mean how to transfer token to an address?

@Radmila56

This comment has been minimized.

Copy link

@Radmila56 Radmila56 commented Oct 21, 2020

@Radmila56

This comment has been minimized.

Copy link

@Radmila56 Radmila56 commented Oct 21, 2020

@Radmila56

This comment has been minimized.

Copy link

@Radmila56 Radmila56 commented Oct 21, 2020

@nautilus2021

This comment has been minimized.

Copy link

@nautilus2021 nautilus2021 commented Apr 25, 2021

can you update source for latest version of pragma solidity?
tnx

@lrod29

This comment has been minimized.

Copy link

@lrod29 lrod29 commented Apr 28, 2021

has Anyone a code for a deflationary token?

@chrismanahan

This comment has been minimized.

Copy link

@chrismanahan chrismanahan commented May 9, 2021

has Anyone a code for a deflationary token?

@lrod29 Having a fixed maximum on your circulating supply should be enough to make a token deflationary. Fiats like USD are inflationary because the gov't is always printing it with no cap.

@towhid135

This comment has been minimized.

Copy link

@towhid135 towhid135 commented May 10, 2021

can you please suggest any article of yours where you showed how to transfer tokens to another address? And how to create another address to testing the transfer process.

@amirkhan2020

This comment has been minimized.

Copy link

@amirkhan2020 amirkhan2020 commented Jun 27, 2021

hi anybody can explaine what this soldity do ??

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment