Jump not working in unity game, what's wrong with c# code?

Question

Unity

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

public class moveplayer : MonoBehaviour
{
   Animator anim;
   Rigidbody2D rb;
   public GameObject leftbtn ;
   public GameObject rightbtn;
   public GameObject jumpbtn ;
   float posJumpBtn;
   float posbtnright;
   float posbtnleft;
   float run;
   bool whenlook ;





    void Start()
    {
        posbtnright = rightbtn.transform.position.y;
        posbtnleft = leftbtn.transform.position.y;
        posJumpBtn = jumpbtn.transform.position.y;
  
        rb = GetComponent<Rigidbody2D>();
        anim = GetComponent<Animator>();

    }

   
    void Update()
    {    if (posJumpBtn != jumpbtn.transform.position.y){
        rb.AddForce (transform.up * 350f  , ForceMode2D.Impulse);
    }

        if(posbtnleft != leftbtn.transform.position.y){
            run = -600f;
            whenlook = false ;
            Flip();
        }
        else if(posbtnright != rightbtn.transform.position.y){
           run = 600f ;
           whenlook = true;
            Flip();
        }  
        else { run = 0f;
        }
        rb.velocity = new Vector2 (run,rb.velocity.y);

        
    }
   void Flip(){
       if(whenlook == false){
           transform.localRotation = Quaternion.Euler(0,0,0);
       }
   
    if (whenlook == true ){
       transform.localRotation = Quaternion.Euler(0,180,0);
       }
   } 
}

Answer 1

void Start()
{
posbtnright = rightbtn.transform.position.y;
posbtnleft = leftbtn.transform.position.y;
posJumpBtn = jumpbtn.transform.position.y;

<b>rb = GetComponent();
anim = GetComponent();</b>

}

I didn’t really read it, but already from the first lines you can see the jamb, which most likely is the problem. What are you trying to assign to the rb and anim variables? Invalid syntax.
Manual on GetComponent
Instead of the code above, you need to use

rb = GetComponent<RigidBody2D>();
anim = GetComponent<Animator>();