Apprendre Solidity — Le Guide Complet

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

contract SimpleStorage {
    uint256 private storedValue;

    event ValueUpdated(uint256 indexed oldValue, uint256 indexed newValue);

    function setValue(uint256 _value) public {
        uint256 oldValue = storedValue;
        storedValue = _value;
        emit ValueUpdated(oldValue, _value);
    }

    function getValue() public view returns (uint256) {
        return storedValue;
    }
}