# Convert array of integers to integer

**URL:** <https://forum.arduino.cc/t/convert-array-of-integers-to-integer/151984>\
**Category:** Programming\
**Created:** [March 21, 2013, 10:15pm UTC](https://forum.arduino.cc/t/convert-array-of-integers-to-integer/151984 "2013-03-21T22:15:24Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![TLERDRDEN](https://avatars.discourse-cdn.com/v4/letter/t/e495f1/32.png) [@TLERDRDEN](https://forum.arduino.cc/u/TLERDRDEN)\
**Post date:** [March 21, 2013, 10:15pm UTC](https://forum.arduino.cc/t/convert-array-of-integers-to-integer/151984/1 "2013-03-21T22:15:24Z")

</div>

Hi guys,  
I am trying to convert an array of integers to an integer. For example, int Array1=[123] --\> int num1 =123.  
Atoi() doesn't work...  
Do you know some way to do it?  
Thanks!

---

<div class="post-metadata">

**Author:** ![marco\_c](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@marco\_c](https://forum.arduino.cc/u/marco_c)\
**Post date:** [March 21, 2013, 10:19pm UTC](https://forum.arduino.cc/t/convert-array-of-integers-to-integer/151984/2 "2013-03-21T22:19:01Z")

</div>

do you mean array1 [1, 2, 3] (ie 3 separate number?)

array[0]\*100 + array[1]\*10 + array[2]

generally you can put this in a loop for the same effect

```cpp
int sum = 0;
for (uint8_t i=0; i<MAX_DIGITS; i++)
  sum = (sum*10)+array[i];

```

---

<div class="post-metadata">

**Author:** ![michinyon](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@michinyon](https://forum.arduino.cc/u/michinyon)\
**Post date:** [March 21, 2013, 11:10pm UTC](https://forum.arduino.cc/t/convert-array-of-integers-to-integer/151984/3 "2013-03-21T23:10:01Z")

</div>

"I am trying to convert an array of integers to an integer. For example, int Array1=[123] --\> int num1 =123."

It would help if you ask a sensible question. This is just nonsense.

---

<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:** [May 5, 2021, 8:08pm UTC](https://forum.arduino.cc/t/convert-array-of-integers-to-integer/151984/4 "2021-05-05T20:08:01Z")

</div>

Closed on May 5, 2021, 8:08pm UTC