how can i decrease the value of an ineger just once in update?

Unity Engine
1

im curently working on a game an whenever the player press the H it heals using a medical syringe,but i want to decrease the current value of syringe_number every time after he uses one.
HERE IS MY CODE:

void Update () {
        if (health_seryngies_number > max_seryngies_number) {
            health_seryngies_number = max_seryngies_number;
        }
        if (health_seryngies_number < 0) {
            health_seryngies_number = 0;
        }
        if (Input.GetKey (KeyCode.H) && healthsyringe.health_seryngies_number > 0 ) {
            decrease_seryngies_number (1);
            anim.Play ("healing");
            print (health_seryngies_number);
            player_controller2.increase_health (30.0f);
            player_controller2.update_healthbar ();
        }
    }
    private void decrease_seryngies_number(int amount_to_decrease)
    {
        health_seryngies_number -= amount_to_decrease;
    }
}
2

use .GetKeyDown or .GetKeyUp instead of .GetKey

For next time, learn how to use code tags - it makes your code much more legible.

3

thanks, it worked but please can you tell me the difference between GetKeyDown and GetKey?

4

GetKey returns “true” every frame as long as the key is held. GetKeyDown returns “true” only for the first frame.

5

thanks