# Adjacent triangle

**URL:** https://community.freefem.org/t/adjacent-triangle/1331
**Category:** General Discussion
**Created:** [November 17, 2021, 9:08am UTC](https://community.freefem.org/t/adjacent-triangle/1331 "2021-11-17T09:08:50Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Amin](https://avatars.discourse-cdn.com/v4/letter/a/8e7dd6/32.png) [@Amin](https://community.freefem.org/u/Amin)
#### Post date: [November 17, 2021, 9:08am UTC](https://community.freefem.org/t/adjacent-triangle/1331/1 "2021-11-17T09:08:50Z")

</div>

Hello,

What is the difference between the two commands:

```auto
Th[1].adj(0);

```

and

```auto
int e;
Th[1].adj((e=0))

```

the latter works but the former does not.  
Thanks.