Making a light turn on and off with the same button

This is what I tried so far, the first function works, the second doesn’t

using UnityEngine;
using System.Collections;

public class Flashlight_Script : MonoBehaviour {
	bool lightbutto=true;
	public Light flashlight;


	void FixedUpdate () {
		if(Input.GetKey(KeyCode.R)&&(flashlight.enabled=true)){
			flashlight.enabled=false;
		}
		if(Input.GetKey(KeyCode.R)&&(flashlight.enabled=false)){
			flashlight.enabled=true;
		}
	}
}

When you say first and second function do you mean this?

 if(Input.GetKey(KeyCode.R)&&(flashlight.enabled=true)){
    flashlight.enabled=false;
 }
 if(Input.GetKey(KeyCode.R)&&(flashlight.enabled=false)){
    flashlight.enabled=true;
 }

They aren’t functions, they are if statements. This is a function.

 void FixedUpdate () {
       if(Input.GetKey(KeyCode.R)&&(flashlight.enabled=true)){
         flashlight.enabled=false;
       }
       if(Input.GetKey(KeyCode.R)&&(flashlight.enabled=false)){
         flashlight.enabled=true;
       }
    }

Your immediate problem is as follows:

if(Input.GetKey(KeyCode.R)&&(flashlight.enabled=true)){

If you want to compare something to something else you need to use “==” not “=” try

if(Input.GetKey(KeyCode.R)&&(flashlight.enabled==true)){

and

if(Input.GetKey(KeyCode.R)&&(flashlight.enabled==false)){

once you have done that you’ll probably find that your light flickers on and off. This is because you have used

Input.GetKey(KeyCode.R)

What this does is return true if a key is held down. What you want is for the torch to come on/go off when ever the key is pressed down initially or when the key is released. Try

Input.GetKeyUp(KeyCode.R)