Web3 Development Guide 2025: เริ่มต้นพัฒนา Blockchain

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract SimpleStorage {
    uint256 private storedData;
    
    event DataStored(uint256 data);
    
    function set(uint256 x) public {
        storedData = x;
        emit DataStored(x);
    }
    
    function get() public view returns (uint256) {
        return storedData;
    }
}