Amount of distance to travel when a key is pressed - unity3d

Question

In code below, I want to manage the amount of distance to travel when a left arrow key is pressed depending upon if it's half way down or not.
The object moves all the way to left on very first press instead of movement to be divided in 3 or 4 parts depending on the above mentioned condition, where am I doing it wrong?
var diff = Mathf.Abs(this.transform.position.x - r.renderer.bounds.min.x);
print("diff" + diff);
var lessdistancetotravel = diff/4;
var moredistancetotravel = diff/3;
if(this.transform.position.x > half)
{
print ("greater than half while moving left");
print("currentpos" + this.transform.position.x); //gives 0.6
print("moredistance " + moredistancetotravel);//gives 0.69
this.transform.position = new Vector3 (this.transform.position.x - moredistancetotravel,
this.transform.position.y,
this.transform.position.z);
print("updated" + (this.transform.position.x - moredistancetotravel)); //gives -0.78,How come?
}

Answer 1

Since you can't check how far down a key is pressed, as Jerdak mentioned in the comments. I would then just measure how long a key has been pressed. You can start counting how long the key has been down and stop counting once it is released. Then you can use that time to determine how far your object can travel.
How to count the time the key has been pressed:
float count = 0.0f;
void Update()
{
if(Input.GetKey("a"))
count += Time.deltaTime;
else if(Input.GetKeyUp("a"))
count = 0.0f;
}
Code resets count back to 0 once you release the key.