Arduino String does not properly convert integer to string

Question

I am using TinkerCad as Arduino UNO R3 simulator. My aim is to convert int to string but the following code prints 188 instead of 180.

void setup()
{
  Serial.begin(115200);
}


void loop()
{
  Serial.println(String(180));
}

Output is 188 as you can see in the screenshot from TinkerCad serial monitor above. Why is there a weird problem with String?

Reduce baud speed. Test using examples from the String() constructor page. It is difficult to believe that you've found a bug in this class. — TomServo, Dec 26 '20 at 19:11
I have tried with ```Serial.begin(9600)```too. It does not make any difference. — The Exile, Dec 26 '20 at 22:02
It's not the question, but using String is never a good idea. To print an `int` use `print`. — datafiddler, Dec 27 '20 at 18:58

score 1 · Answer 1 · answered Dec 27 '20 at 18:54

1

Seems a tinkercad problem. Your weird sketch works well on a real Arduino.

answered Dec 27 '20 at 18:54

datafiddler

1,755
3
17
30

score 1 · Answer 2 · edited Mar 31 '21 at 15:59

1

Had the same issue with tinkercad.
String (intval) or (String) intval was not working.

Kludge: using lcd.write(int); instead if possible (i.e. use int where you can and send int directly to write).

edited Mar 31 '21 at 15:59

DaveL17

1,673
7
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answered Mar 27 '21 at 12:42

gologozo

11
1

score 0 · Answer 3 · answered Dec 27 '20 at 17:57

0

That's really weird. Try this:

int intValue = 180;
string stringValue;

void setup()
  {
    Serial.begin(9600);
  }


void loop()
  {
    stringValue = String(intValue);
    Serial.println(stringValue);
  
}

answered Dec 27 '20 at 17:57

Slushee

26
6

Arduino String does not properly convert integer to string

3 Answers3