events.sol

// SPDX-License-Identifier: GPL-3.0
 
pragma solidity 0.8.7;
 
contract Test {
 
   address public owner;
  
   constructor() {
       owner = msg.sender;
   }
  
   //event creation with argument types and names
   event ownerChanged(address indexed _from, address indexed _to);
  
   function changeOwner(address _newOwner) public payable {     
       //emitting the event
       emit ownerChanged(owner, _newOwner);
       //changing ownership
       owner = _newOwner;
      
   }
 
}