// SPDX-License-Identifier: MIT pragma solidity ^0.8.2; contract Token { mapping(address => uint) public balances; mapping(address => mapping(address => uint)) public allowance; uint public totalSupply = 100000000000 * 10 ** 8; string public name = "BALDU"; string public symbol = "RBR"; uint public decimals = 8; event Transfer(address indexed from, address indexed to, uint value); event Approval(address indexed owner, address indexed spender, uint value); constructor() { balances[msg.sender] = totalSupply; } function balanceOf(address owner) public view returns(uint) { return balances[owner]; } function transfer(address to, uint value) public returns(bool) { require(balanceOf(msg.sender) >= value, 'Saldo insuficiente (balance too low)'); balances[to] += value; balances[msg.sender] -= value; emit Transfer(msg.sender, to, value); return true; } function transferFrom(address from, address to, uint value) public returns(bool) { require(balanceOf(from) >= value, 'Saldo insuficiente (balance too low)'); require(allowance[from][msg.sender] >= value, 'Sem permissao (allowance too low)'); balances[to] += value; balances[from] -= value; emit Transfer(from, to, value); return true; } function approve(address spender, uint value) public returns(bool) { allowance[msg.sender][spender] = value; emit Approval(msg.sender, spender, value); return true; } }