Constant Running on x axis

Hi all,

I am new to Unity and I am trying to create a game (side scroller) where a character is constantly running on the x axis. The only controls I need is a jump function so the character can jump over obstacles. After searching and searching I found this code but I can't make any since of it and keep getting the following errors:

Assets/characterscripts/constantrun.js(1,29): BCE0043: Unexpected token: :. Assets/characterscripts/constantrun.js(1,44): UCE0001: ';' expected. Insert a semicolon at the end.

Assets/characterscripts/constantrun.js(2,11): BCE0044: expecting :, found 'float'.

Code Follows:

 public class CharacterMotor : MonoBehaviour 
 
 {
     const float constantMotion = 10;
     //If it really is a constant speed you can declare it as such and it will prevent you from changing it.
     //Otherwise just remove the modifier.
 
     public int moveSpeed;
     public int jumpSpeed;
     //how fast do we move side to side and jump.
 
     public float gravity = 9.8f;
 
     private CharacterController controller;
 
     public void Start () {
         controller = GetComponent<CharacterController>();
         //cache a link to the Character Controller.
     }
 
     public void Update () {
          Vector3 moveDirection = new Vector3( 0 , 0 , constantMotion );
          //Create a new Direction vector
          if( controller.isGrounded() ) {  //Are we touching the ground?
              moveDirection.x = Input.GetAxis("Horizontal") * moveSpeed;
 
              if( Input.GetButtonDown("Jump") ) {
                  moveDirection.y = jumpSpeed;
                  //Set the vertical direction to the jump speed.
 
                  //moveDirection = transform.TransformDirection(moveDirection);
                  //You don't need this line since you will only be moving in one direction,
                  //But you will if your character rotates any.
              }
          }
 
          moveDirection.y -= gravity * Time.deltaTime;
          //This will pull the character back down.
          controller.Move(moveDirection * Time.deltaTime);
          //Move the character in the direction of moveDirection at a FPS independent rate.
     }
 }         

   

Any kind of help will be greatly appreciated,

Thanks!