Why is my bool being set to true when program is run?

Questions & Answers
1

When I start the game I get the message “Functioning Properly” and I’m not sure why… Debug Windows is set to clear on play too.

using UnityEngine;
using System.Collections;

public class SimpleMovement : MonoBehaviour {
	public bool movingBackwards;
	public Vector2 thrustBackward;
	public Vector2 thrustForward;
	public Vector2 thrustUp;
	public Rigidbody2D rb2D;
	void Start () 
	{
		movingBackwards = false;
		thrustBackward = new Vector2 (-10, 0);
		thrustForward = new Vector2 (10, 0);
		thrustUp = new Vector2(0,4);
		rb2D = GetComponent<Rigidbody2D> ();
	}
	void Backward () 
	{
		rb2D.AddForce(thrustBackward, ForceMode2D.Force);
	}
	void Forward () 
	{
		rb2D.AddForce(thrustForward, ForceMode2D.Force);
	}
	void Jump () 
	{
		rb2D.AddForce(thrustUp, ForceMode2D.Impulse);
	}
	void Update() 
	{
		if (Input.GetKey(KeyCode.RightArrow))
			Forward();
		if(Input.GetKeyDown(KeyCode.Space))
			Jump();
		if(Input.GetKey(KeyCode.LeftArrow))
			Backward();
			movingBackwards = true;
		if (movingBackwards == true)
			Debug.Log ("Functioning Properly");
	}
}
2

It is because the variable movingBackwards in the Update() function is not within the if block as intended which can be seen here

if(Input.GetKey(KeyCode.LeftArrow))
    Backward();
    movingBackwards = true;

In the above movingBackwards is always set to true from the very first frame. You want to change the block to look like this

if(Input.GetKey(KeyCode.LeftArrow))
{
    Backward();
    movingBackwards = true;
}

Or you could move the variable movingBackwards to the Backward() function like this instead

void Backward () 
{
    movingBackwards = true;
    rb2D.AddForce(thrustBackward, ForceMode2D.Force);
}

But no matter what I would suggest either placing this

movingBackwards = false;

at the very top of the Update() function or in in the Forward() function. Otherwise once set to true the movingBackwards variable will remain true.