c# - How to increase a counter whilst a key is pressed in Unity? -

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i creating app turns sphere earth when w pressed speed , s used slow down. unable how find out how make speed increase. here code:

using unityengine; using system.collections; public class spin : monobehaviour{  public float speed;  void update () {     transform.rotate(vector3.up,speed * time.deltatime);     if (input.getkey ("escape")) {         application.quit();     }     if (input.getkey ("w")) {         transform.rotate(vector3.up,speed + 1);      }     if (input.getkey ("s")) {         transform.rotate(vector3.up,speed - 1);      } } }

does have idea how can increase speed how long button pressed?

p.s wish write in c#

excuse lack of knowledge unity, looks if statements don't update value of speed. now, if key pressed, rotating @ value of speed + 1. speed never changed.

maybe try this? 

if (input.getkey("w")) {     transform.rotate(vector3.up, speed + 1);     speed++; }

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