This smart contract demonstrates a basic token on the Ethereum blockchain. It implements essential features such as token transfers, allowance, and approval mechanisms.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract SimpleToken {
string public name = "SimpleToken";
string public symbol = "STK";
uint8 public decimals = 18;
uint256 public totalSupply;
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowance;
// Event declarations
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
constructor(uint256 _initialSupply) {
totalSupply = _initialSupply * 10 ** uint256(decimals);
balanceOf[msg.sender] = totalSupply;
}
// Transfer tokens from sender to recipient
function transfer(address _to, uint256 _value) public returns (bool success) {
require(_to != address(0), "Invalid address");
require(balanceOf[msg.sender] >= _value, "Insufficient balance");
balanceOf[msg.sender] -= _value;
balanceOf[_to] += _value;
emit Transfer(msg.sender, _to, _value);
return true;
}
// Approve a spender to withdraw tokens from the sender's account
function approve(address _spender, uint256 _value) public returns (bool success) {
allowance[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
// Transfer tokens from an approved spender
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
require(_from != address(0), "Invalid sender address");
require(_to != address(0), "Invalid recipient address");
require(balanceOf[_from] >= _value, "Insufficient balance");
require(allowance[_from][msg.sender] >= _value, "Allowance exceeded");
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
allowance[_from][msg.sender] -= _value;
emit Transfer(_from, _to, _value);
return true;
}
}
The constructor initializes the total supply and assigns it to the creator's address.
This smart contract is a basic example of how to implement token functionality on the Ethereum blockchain. It can be extended further for more complex use cases like staking, token burning, or governance.
This smart contract demonstrates a basic token on the Ethereum blockchain. It implements essential features such as token transfers, allowance, and approval mechanisms.
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract SimpleToken { string public name = "SimpleToken"; string public symbol = "STK"; uint8 public decimals = 18; uint256 public totalSupply; mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) public allowance; // Event declarations event Transfer(address indexed from, address indexed to, uint256 value); event Approval(address indexed owner, address indexed spender, uint256 value); constructor(uint256 _initialSupply) { totalSupply = _initialSupply * 10 ** uint256(decimals); balanceOf[msg.sender] = totalSupply; } // Transfer tokens from sender to recipient function transfer(address _to, uint256 _value) public returns (bool success) { require(_to != address(0), "Invalid address"); require(balanceOf[msg.sender] >= _value, "Insufficient balance"); balanceOf[msg.sender] -= _value; balanceOf[_to] += _value; emit Transfer(msg.sender, _to, _value); return true; } // Approve a spender to withdraw tokens from the sender's account function approve(address _spender, uint256 _value) public returns (bool success) { allowance[msg.sender][_spender] = _value; emit Approval(msg.sender, _spender, _value); return true; } // Transfer tokens from an approved spender function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) { require(_from != address(0), "Invalid sender address"); require(_to != address(0), "Invalid recipient address"); require(balanceOf[_from] >= _value, "Insufficient balance"); require(allowance[_from][msg.sender] >= _value, "Allowance exceeded"); balanceOf[_from] -= _value; balanceOf[_to] += _value; allowance[_from][msg.sender] -= _value; emit Transfer(_from, _to, _value); return true; } }
The constructor initializes the total supply and assigns it to the creator's address.
This smart contract is a basic example of how to implement token functionality on the Ethereum blockchain. It can be extended further for more complex use cases like staking, token burning, or governance.
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