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Question by ZacharyLapidus · May 22, 2019 at 11:49 PM · c#rotationcrashing

Unity Crashes when running this code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpotRotate : MonoBehaviour {
private float x;
private bool rotateX;
private float rotationSpeed;

 void Start()
 {
     x = 90.0f;
     rotateX = true;
     rotationSpeed = 10.0f;

 }

 // Update is called once per frame
 void Update()
 {
     while (rotateX = true)
     {
         x += Time.deltaTime * rotationSpeed;

         if (x > 140)
             rotateX = false;
     }

     while (rotateX = false)
     {
         x += Time.deltaTime * -rotationSpeed;


         if (x < 50)
             rotateX = true;
     }
 }

}

I'm trying to make a simple spotlight that rotates back and forth from 140 degrees to 50 degrees, and then back again, and I have a very simple bit of code. Should go without saying I'm very very new to programming. ( I don't know why some of that is in a box and not all of it is)

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Answer by k234234w · May 23, 2019 at 12:11 AM

In your while conditions you have assignment instead of comparison. You should just take out the while conditions altogether and just do if(rotate == true){//Code} else {//Code}

 private void Update()
 {
    if(rotateX)
    {
         x+= Time.deltaTime * rotationSpeed;
         if(x > 140)
         {
             rotateX = false;
         }
    }
    else
    {
          x += Time.deltaTime * -rotationSpeed;
          if (x < 50)
          {
              rotateX = true;
          }
    }
 }     

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avatar image k234234w · May 23, 2019 at 12:20 AM 0
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while(rotateX = true) will cause it to run forever, because you are basically writing while(true). while(rotateX == true) would be the correct way, or you could write it as while(rotateX). But how you currently have it is you are assigning rotateX to true so it will continue forever. But you should change it to use if conditions ins$$anonymous$$d because the while conditions will continue until the condition isnt satisfied, so you are blocking code execution until whenever that happens.

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Answer by timurkalegoman · May 23, 2019 at 12:21 AM

Because you used the While method, in the Update function, it makes Unity wait forever until the statement is true. The while method doesn't let the next thing happen until it is true, thus, crashing unity because it is never true, so it is stuck there forever, in a loop of checking if the statement in true.

 private int ex = 2;
 
 void Update()
 {
   while(ex == 1)
   {
     
   }
 }

Use the if funtion instead.

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avatar image Tobychappell · May 23, 2019 at 12:36 AM 1
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while-loops 'loop' when the condition is true, not false.

in your example ex must be equal to 1 for it to be causing an infinite loop, as it is set to 2 execution will skip the while block , as k234234w said, it is because an assignment '= true' is being done inside the condition check

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