how to check active scene in unity code example

Example 1: unity how to see what scen you are in

void Update()
     {
     if (SceneManager.GetActiveScene () == SceneManager.GetSceneByName ("scene1")) 
         {
         SceneManager.LoadScene ("scene2");
         }
 
  else if (SceneManager.GetActiveScene () == SceneManager.GetSceneByName ("scene2"))
         {
         SceneManager.LoadScene ("scene1");
         }
     }

Example 2: unity scene name get

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class GetSceneName : MonoBehavior {

	Scene m_Scene;
	string sceneName;

	private void Start() {
   		m_Scene = SceneManager.GetActiveScene();
   		sceneName = m_Scene.name;
 	}
}