# Compilation error from "Serial Input Basics" tutorial code

**URL:** <https://forum.arduino.cc/t/compilation-error-from-serial-input-basics-tutorial-code/849088>\
**Category:** Programming\
**Created:** [April 15, 2021, 4:13pm UTC](https://forum.arduino.cc/t/compilation-error-from-serial-input-basics-tutorial-code/849088 "2021-04-15T16:13:11Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![medc](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@medc](https://forum.arduino.cc/u/medc)\
**Post date:** [April 15, 2021, 4:13pm UTC](https://forum.arduino.cc/t/compilation-error-from-serial-input-basics-tutorial-code/849088/1 "2021-04-15T16:13:11Z")

</div>

I tried using the code from example 2 and I'm getting a compilation error from the line below.

`if (rc != endMarker) {...}`

The error reads:

> ISO C++ forbids comparison between pointer and integer [-fpermissive]

Suggestions?

---

<div class="post-metadata">

**Author:** ![sterretje](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/sterretje/32/391294_2.png) [@sterretje](https://forum.arduino.cc/u/sterretje)\
**Post date:** [April 15, 2021, 4:23pm UTC](https://forum.arduino.cc/t/compilation-error-from-serial-input-basics-tutorial-code/849088/2 "2021-04-15T16:23:24Z")

</div>

No problems here.

```cpp
Archiving built core (caching) in: C:\Users\Sterretje\AppData\Local\Temp\arduino_cache_212799\core\core_arduino_avr_nano_cpu_atmega328old_4e759d11e131d256fe058d84342dcde1.a
Sketch uses 1616 bytes (5%) of program storage space. Maximum is 30720 bytes.
Global variables use 240 bytes (11%) of dynamic memory, leaving 1808 bytes for local variables. Maximum is 2048 bytes.

```

---

<div class="post-metadata">

**Author:** ![Deva\_Rishi](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/deva_rishi/32/227254_2.png) [@Deva\_Rishi](https://forum.arduino.cc/u/Deva_Rishi)\
**Post date:** [April 15, 2021, 7:05pm UTC](https://forum.arduino.cc/t/compilation-error-from-serial-input-basics-tutorial-code/849088/3 "2021-04-15T19:05:49Z")

</div>

```cpp
    char endMarker = '>';
    char rc;
```

maybe there is a typo in you sketch.

---

<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [August 13, 2021, 7:06pm UTC](https://forum.arduino.cc/t/compilation-error-from-serial-input-basics-tutorial-code/849088/4 "2021-08-13T19:06:13Z")

</div>

Closed on August 13, 2021, 7:06pm UTC

This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.