Need help with a "roll" script (C#)

Questions & Answers
1

I’m trying to make a simple 3rd person RPG and want the character to be able to do a roll to dodge. Right now it just makes it impossible to walk in the opposite direction after hitting Shift-W. My current code is this:

    public class Roll : MonoBehaviour {
    	
    	public float testStamina = 100.0f;
    	public float coolDown = 2.0f;
    	public float rollLength = 5.0f;
    	public float lastRoll;
    	public float rollDuration = 2.0f;
    	public float startTime;
    	bool canRoll;
    	
    	// Use this for initialization
    	void Start () {
    		lastRoll = Time.time;
    		canRoll = true;
    	}
    	
    	// Update is called once per frame
    	void Update () {
    		if(coolDown >= Time.time - lastRoll)
    			canRoll = true;
    		if(Input.GetKey(KeyCode.W) && Input.GetKey(KeyCode.LeftShift) && canRoll == true){
    			canRoll = false;
    			startTime = Time.time;
    			if(startTime - rollDuration <= Time.time){
    				rigidbody.AddForce(Vector3.forward * -100f);
    			}
    			lastRoll = Time.time;
    		}
    	}
    }
`
I feel like its something I should really know how to do, but its 2 in the morning and I need to finish this. Any help is greatly appreciated. 
`
2

public class Roll : MonoBehaviour {

	public float testStamina = 100.0f, coolDown = 2.0f, rollLength = 5.0f, lastRoll, rollDuration = 2.0f, startTime;
	public bool canRoll;
	 
	void Start() 
	{
		lastRoll = Time.time;
		canRoll = true;
	}
	 
	void Update() 
	{
		if(coolDown >= (Time.time - lastRoll))
			canRoll = true;
			
		if((Input.GetKey(KeyCode.W) && Input.GetKey(KeyCode.LeftShift)) && canRoll == true)
		{
		
			canRoll = false;
			startTime = Time.time;
			
			if((startTime - rollDuration) <= Time.time)
				rigidbody.AddForce(Vector3.forward * -100f);
			
			lastRoll = Time.time;
		
		}
		
	}
	
}

Your conditional grouping isn’t correct.