how to flip a 3d character.,how can i flip my 3d character to the left?

using UnityEngine; using System.Collections;

public class PlayerController: MonoBehaviour { public float speed = 10.0f; public Animator anim;

 void Update()
 {
     float translation = Input.GetAxis("Horizontal") * speed;
     translation *= Time.deltaTime;
     transform.Translate(0, 0, translation);
     if (translation == 0)
     {
         anim.SetBool("running", false);
     }
     else
     {
         anim.SetBool("running", true);
     }

 }

}