unity3d - Basic C# Unity2D movement script not functioning -

hi there fellow overflowers! have dived c# in unity, because believe has more functionality unityscript, , come c++ background. referencing code 2d script in sample assets, have tried create own. code below:

    using unityengine;  public class playercontrol : monobehaviour { //variables     [hideininspector]     public bool facingforward = true; //for flip() function     bool isground = true; //for grounded() function     public float maxspeed = 5.0f; //terminal sideways velocity     public float horizonaxis; //checks a/d movement      public float jumpfloat = 1000.0f; //modular, use unity editor     public float movefloat = 400.0f; // "                       "      void start() {          //transform.position(0,0,0);      }      void flip() {         facingforward = !facingforward; //switches boolean         vector3 thescale = transform.localscale; //assigns vector localscale of player         thescale.x *= -1; //if x = 1, position becomes -1 , flips         transform.localscale = thescale; //reassigns localscale update thescale     }     bool grounded() {         if (transform.position.y > 1) { //if position of gameobject greater 1, not grounded             isground = false;         } else {             isground = true;         }         return isground; //function returns true or false isground     }      void update() {         horizonaxis = /*unityengine.*/input.getaxis ("horizontal"); //assigns horizonaxis a/d movement unityengine.input         if (horizonaxis * rigidbody2d.velocity.x > maxspeed) { // if input a/d current x velocity of gameobject greater maxspeed                      rigidbody2d.velocity = new vector2 (mathf.sign (rigidbody2d.velocity.x) * maxspeed, rigidbody2d.velocity.y); //1 or -1 times max speed, depending on direction     }      else if (horizonaxis * rigidbody2d.velocity.x < maxspeed) { //if input a/d less terminal velocity         rigidbody2d.addforce(vector2.right * horizonaxis * movefloat); //add force right equivilant input scalar movefloat     }         if (input.getbuttondown ("jump")) { //if space             if(isground) { //and isground returns true                 rigidbody2d.addforce(new vector2(0.0f, jumpfloat)); //add upwards force bottom of rigidbody2d                 isground = false; //resets isground value             }         }         if (horizonaxis > 0 && !facingforward) {//if unityengine.input right , facing left             flip (); //execute         }         else if (horizonaxis < 0 && facingforward) { //else                     flip (); //execute          }      } } 

unfortunately, code doesn't work. no compile errors, input not effect current position of character. should using transform.translate change position, or stick addforce vector2 until character hits maxspeed?

thanks heaps :)

i (kinda) fixed jerky jumping issue, input in update() function switches bool in fixedupdate()

void update () {     if (input.getkeydown (keycode.space) && playergrounded) {         playerjumped = true;     } } 

then in fixedupdate() looked bool , did addforce

void fixedupdate () {     if (playerjumped) {         playerjumped = false;         rigidbody2d.addforce (new vector2 (0, jumpforce),forcemode2d.impulse);         playergrounded = false;     } } 

setting playerjumped false makes sure doesn't run several times , player can't jump again because set grounded false. grounded gets set true when player collides things tagged "ground".

i'm still new unity , c# overall can't guarantee best (or good) way. hope somehow though ;)