# Can't use the original functions in processing 4.0's class?

**URL:** <https://discourse.processing.org/t/cant-use-the-original-functions-in-processing-4-0s-class/31694>\
**Category:** Beginners\
**Created:** [August 12, 2021, 3:08am UTC](https://discourse.processing.org/t/cant-use-the-original-functions-in-processing-4-0s-class/31694 "2021-08-12T03:08:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![LOOOOOOOOP](https://avatars.discourse-cdn.com/v4/letter/l/7993a0/32.png) [@LOOOOOOOOP](https://discourse.processing.org/u/LOOOOOOOOP)\
**Post date:** [August 12, 2021, 3:08am UTC](https://discourse.processing.org/t/cant-use-the-original-functions-in-processing-4-0s-class/31694/1 "2021-08-12T03:08:49Z")

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When I use rect(),or line() in classes, it works in processing 3.  
But I don’t know what is going on in processing 4.

```auto

class t{
  t(){}
  void test(){
    rect(0,0,30,50);
  }
}

```

The function rect(int, int, int, int) does not exist.

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<div class="post-metadata">

**Author:** ![Chrisir](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/chrisir/32/45_2.png) [@Chrisir](https://discourse.processing.org/u/Chrisir)\
**Post date:** [August 12, 2021, 7:02am UTC](https://discourse.processing.org/t/cant-use-the-original-functions-in-processing-4-0s-class/31694/2 "2021-08-12T07:02:36Z")

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Is this your entire code

Add setup and draw

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<div class="post-metadata">

**Author:** ![LOOOOOOOOP](https://avatars.discourse-cdn.com/v4/letter/l/7993a0/32.png) [@LOOOOOOOOP](https://discourse.processing.org/u/LOOOOOOOOP)\
**Post date:** [August 12, 2021, 7:06am UTC](https://discourse.processing.org/t/cant-use-the-original-functions-in-processing-4-0s-class/31694/3 "2021-08-12T07:06:41Z")

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Reopened it and it worked just fine.