How to infinite loop numbers in while loops? (Unity3D- unityscript) - loops

Question

function OnMouseDown () {
rotationNumber +=1;
}
function Update () {
while (rotationNumber == 1) {
gameObject.GetComponent(SpriteRenderer).sprite = leftArrow;
return;
}
while (rotationNumber == 2) {
gameObject.GetComponent(SpriteRenderer).sprite = upArrow;
return;
}
while (rotationNumber == 3) {
gameObject.GetComponent(SpriteRenderer).sprite = rightArrow;
return;
}
while (rotationNumber == 4) {
gameObject.GetComponent(SpriteRenderer).sprite = upArrow;
rotationNumber = 1;
return;
}
}
I want to loop this but when I click it the fourth time it just goes straight to the first image. I tried yield WaitForSeconds but it didn't work.

Answer 1

The problem is that you are setting rotationNumber to 1 inside the while loop. Do it in this way:
function OnMouseDown () {
rotationNumber += 1;
if ( rotationNumber > 4 ) rotationNumber = 1;
}
function Update () {
while (rotationNumber == 1) {
gameObject.GetComponent(SpriteRenderer).sprite = leftArrow;
return;
}
while (rotationNumber == 2) {
gameObject.GetComponent(SpriteRenderer).sprite = upArrow;
return;
}
while (rotationNumber == 3) {
gameObject.GetComponent(SpriteRenderer).sprite = rightArrow;
return;
}
while (rotationNumber == 4) {
gameObject.GetComponent(SpriteRenderer).sprite = upArrow;
return;
}
}

Answer 2

I'm not quite sure why you are using a while loop within in an update loop, but try this below. Every time you click the rotation number increases and the sprite is changed until the rotationNumber variable is > 4 in which case it resets the variable back to 1.
function Update()
{
if(rotationNumber == 1)
{
gameObject.GetComponent(SpriteRenderer).sprite = leftArrow;
}else if(rotationNumber ==2)
{
gameObject.GetComponent(SpriteRenderer).sprite = upArrow;
}else if(rotationNumber ==3)
{
gameObject.GetComponent(SpriteRenderer).sprite = rightArrow;
}else if(rotationNumber == 4)
{
gameObject.GetComponent(SpriteRenderer).sprite = upArrow;
}else if(rotationNumber > 4)
{
rotationNumber = 1;
}
}