3d character movement c sharp in unity code example

Example: C sharp character movement

using UnityEngine; using System.Collections;  public class example : MonoBehaviour {     //Variables     public float speed = 6.0F;     public float jumpSpeed = 8.0F;      public float gravity = 20.0F;     private Vector3 moveDirection = Vector3.zero;      void Update() {         CharacterController controller = GetComponent<CharacterController>();         // is the controller on the ground?         if (controller.isGrounded) {             //Feed moveDirection with input.             moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));             moveDirection = transform.TransformDirection(moveDirection);             //Multiply it by speed.             moveDirection *= speed;             //Jumping             if (Input.GetButton("Jump"))                 moveDirection.y = jumpSpeed;                      }         //Applying gravity to the controller         moveDirection.y -= gravity * Time.deltaTime;         //Making the character move         controller.Move(moveDirection * Time.deltaTime);     } }