Can't Call OnTriggerEnter(Collider other)

Hello! I am making a grenade pickup system and I can't seem to call the "OnTriggerEnter(Collider other)" method when I reference it inside the update method it shows the red underline under it. Any suggestions?

Code:
using UnityEngine;
public class GrenadePickup : MonoBehaviour
{
public GrenadeThrower grenadeThrower;


// Start is called before the first frame update
void Start()
{
}


// Update is called once per frame
void Update()
{
if (Input.GetKeyDown(KeyCode.P))
{
OnTriggerEnter();
}
}


public void OnTriggerEnter(Collider other)
{
if (other.gameObject.tag == "Grenade")
{
Debug.Log("GrenadePickUp");
Destroy(gameObject);
grenadeThrower.grenadeAmount += 1f;
}
}
}

 

OnTriggerEnter takes a collider as an argument. You are trying to call it with no arguments.

Are you doing this to test the function, or do you want to push P to pick up the grenade, or something?

 

I want to press P so you pick up the grenade. Do you know how?

 

You really need to go to the http://learn.unity.com and go through the beginner tutorial series. You're lacking absolutely basic concepts.

In a nutshell:
- put trigger collider on the objects you want to pick up
- when the player character enters in the trigger show a UI message to "press <whateverbutton> to pick up"
- when the player leaves the collider hide the message
- when the player is in the trigger and they hit the <whateverbutton> then:
--- destroy the object on the ground
--- add the proper entry in the inventory you're making

If you need help to build the inventory, you can head to either the learn section, they have a tutorial on it or more beginner friendly tutorials are on Youtube, I mean a lot. Just search and pick whichever is sympathetic.