# اسمارت کانترکت

**Published by:** [Masoud](https://paragraph.com/@0xmasoud/)
**Published on:** 2023-02-22
**URL:** https://paragraph.com/@0xmasoud/zJgMPi7zzWmMwRtsHo7t

## Content

// SPDX-License-Identifier: MIT pragma solidity ^0.8.13; // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.0.0/contracts/token/ERC20/IERC20.sol interface IERC20 { function totalSupply() external view returns (uint); function balanceOf(address account) external view returns (uint); function transfer(address recipient, uint amount) external returns (bool); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint amount) external returns (bool); function transferFrom( address sender, address recipient, uint amount ) external returns (bool); event Transfer(address indexed from, address indexed to, uint value); event Approval(address indexed owner, address indexed spender, uint value); } contract ERC20 is IERC20 { uint public totalSupply; mapping(address => uint) public balanceOf; mapping(address => mapping(address => uint)) public allowance; string public name = "Solidity by Example"; string public symbol = "PAHLAVI"; uint8 public decimals = 18; function transfer(address recipient, uint amount) external returns (bool) { balanceOf[msg.sender] -= amount; balanceOf[recipient] += amount; emit Transfer(msg.sender, recipient, amount); return true; } function approve(address spender, uint amount) external returns (bool) { allowance[msg.sender][spender] = amount; emit Approval(msg.sender, spender, amount); return true; } function transferFrom( address sender, address recipient, uint amount ) external returns (bool) { allowance[sender][msg.sender] -= amount; balanceOf[sender] -= amount; balanceOf[recipient] += amount; emit Transfer(sender, recipient, amount); return true; } function mint(uint amount) external { balanceOf[msg.sender] += amount; totalSupply += amount; emit Transfer(address(0), msg.sender, amount); } function burn(uint amount) external { balanceOf[msg.sender] -= amount; totalSupply -= amount; emit Transfer(msg.sender, address(0), amount); } }

## Publication Information

- [Masoud](https://paragraph.com/@0xmasoud/): Publication homepage
- [All Posts](https://paragraph.com/@0xmasoud/): More posts from this publication
- [RSS Feed](https://api.paragraph.com/blogs/rss/@0xmasoud): Subscribe to updates
- [Twitter](https://twitter.com/Mesut_msd): Follow on Twitter