Playermovement

using UnityEngine;
using System.Collections;

public class Playermovement : MonoBehaviour
{
	private float movementSpeed = 5.0f;
	private bool isGrounded = true;
    private bool hasDouble = true;
	private float tempMoveSpeed;

    public int jumpForce = 300;


	void Update() 
	{	
		GetComponent<Rigidbody>().velocity = new Vector3(0, GetComponent<Rigidbody>().velocity.y, 0); //Set X and Z velocity to 09
		//Vector3 movement = (Input.GetAxis("Horizontal") * -Vector3.left * movementSpeed) + (Input.GetAxis("Vertical") * Vector3.forward * movementSpeed);
		//movement *= Time.deltaTime;
		float moveInputX = (Input.GetAxis("Horizontal") * Time.deltaTime * movementSpeed);
		//float moveInputZ = (Input.GetAxis("Vertical") * Time.deltaTime * movementSpeed);
		transform.position += new Vector3(moveInputX, 0, 0); //last 0 is moveInputZ if needed

        if (Input.GetButtonDown("Jump"))
        {
            if (isGrounded)
            {
                GetComponent<Rigidbody>().velocity = new Vector3(0, 0, 0);
                GetComponent<Rigidbody>().AddForce(new Vector3(0, jumpForce, 0), ForceMode.Force);
                isGrounded = false;
                movementSpeed = 10;
                hasDouble = true;
            }
            else if (hasDouble)
            {
                GetComponent<Rigidbody>().velocity = new Vector3(0, 0, 0);
                GetComponent<Rigidbody>().AddForce(new Vector3(0, jumpForce, 0), ForceMode.Force);
                isGrounded = false;
                hasDouble = false;
                movementSpeed = 10;
            }
        }

		while (Input.GetKeyDown(""))
		{
			tempMoveSpeed = movementSpeed;
			movementSpeed = movementSpeed + 5;
		}
		movementSpeed = tempMoveSpeed;
	}

	void Jump()
	{
		if (!isGrounded) {return;}
		isGrounded = false;
		GetComponent<Rigidbody>().velocity = new Vector3(0, 0, 0);
		GetComponent<Rigidbody>().AddForce(new Vector3(0, 300, 0), ForceMode.Force); 
	}

	void OnCollisionEnter(Collision other)
	{
		if (other.gameObject.tag == "platform")
		{
			isGrounded = true;
            hasDouble = true;
			movementSpeed = 15;
		}            
	}

	/*void FixedUpdate()
    {
        isGrounded = Physics.Raycast(transform.position, - Vector3.up, 1.0f);

        if (isGrounded)
        {
            Jump(); //Automatic jumping
        }
    }*/


}