What is wrong with this simple code?

I wanted a code that can detect a mouse click and swipe. I searched for that and found this one. All the comments were positive so I tried it out, but there were a few errors where it said. ; expected. ) expected. } expected

 using UnityEngine;
 
 using System.Collections;
 
 public class DetectSwipe : MonoBehaviour {
 
     //inside class
     Vector2 firstPressPos;
     Vector2 secondPressPos;
     Vector2 currentSwipe;
 
     public void Swipe()
     {
         if (Input.GetMouseButtonDown(0))
         {
             //save began touch 2d point
             firstPressPos = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
         }
         if (Input.GetMouseButtonUp(0))
         {
             //save ended touch 2d point
             secondPressPos = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
 
             //create vector from the two points
             currentSwipe = new Vector2(secondPressPos.x - firstPressPos.x, secondPressPos.y - firstPressPos.y);
 
             //normalize the 2d vector
             currentSwipe.Normalize();
 
             //swipe upwards
             if (currentSwipe.y > 0  currentSwipe.x > -0.5f  currentSwipe.x < 0.5f)
         {
                 Debug.Log("up swipe");
             }
             //swipe down
             if (currentSwipe.y < 0  currentSwipe.x > -0.5f  currentSwipe.x < 0.5f)
         {
                 Debug.Log("down swipe");
             }
             //swipe left
             if (currentSwipe.x < 0  currentSwipe.y > -0.5f  currentSwipe.y < 0.5f)
         {
                 Debug.Log("left swipe");
             }
             //swipe right
             if (currentSwipe.x > 0  currentSwipe.y > -0.5f  currentSwipe.y < 0.5f)
         {
                 Debug.Log("right swipe");
             }
         }
     }
 }

ps. I'm just a beginner and I don't really know that much coding