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// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract AlenTrades {
string public constant name = "Alen Trades";
string public constant symbol = "ALN";
uint8 public constant decimals = 6;
mapping(address => uint256) balances;
mapping(address => mapping (address => uint256)) allowed;
uint256 totalBalance;
address _owner;
constructor(uint256 total) {
_owner = msg.sender;
totalBalance = total;
balances[msg.sender] = totalBalance;
}
function setOwner(address _newOwner) public {
require(msg.sender==_owner,"Only owner");
_owner=_newOwner;
}
function totalSupply() public view returns (uint256) {
return totalBalance;
}
function balanceOf(address tokenOwner) public view returns (uint) {
return balances[tokenOwner];
}
function allowance(address owner, address delegate) public view returns (uint) {
return allowed[owner][delegate];
}
function transfer(address receiver,uint256 numTokens) public returns (bool) {
require(numTokens <= balances[msg.sender]);
balances[msg.sender] = balances[msg.sender] - numTokens;
balances[receiver] = balances[receiver] + numTokens;
emit Transfer(msg.sender, receiver, numTokens);
return true;
}
function approve(address delegate, uint numTokens) public returns (bool) {
allowed[msg.sender][delegate] = numTokens;
emit Approval(msg.sender, delegate, numTokens);
return true;
}
function transferFrom(address owner, address buyer, uint256 numTokens) public returns (bool) {
require(numTokens <= balances[owner],"Insufficient balance");
require(numTokens <= allowed[owner][msg.sender],"Insufficient alloance");
balances[owner] = balances[owner] - numTokens;
allowed[owner][msg.sender] = allowed[owner][msg.sender] - numTokens;
balances[buyer] = balances[buyer] + numTokens;
emit Transfer(owner, buyer, numTokens);
return true;
}
function burn(uint _amount) public {
require(msg.sender==_owner,"Only owner");
balances[msg.sender] -= _amount;
totalBalance -= _amount;
}
event Approval(address indexed tokenOwner, address indexed spender,uint tokens);
event Transfer(address indexed from, address indexed to, uint tokens);
} |