Using stdlib in web IDE?

General
1

Hi,

Is it posible to use stdlib.h in projects?

I receive error:
error: ‘dtostrf’ was not declared in this scope

2

Looks like it’s already included, just add this line to the top of your code:

extern char *dtostrf (double val, signed char width, unsigned char prec, char *sout);

2 Likes
3

BTW @Dave do you think this should be required to have to use extern or should it just work?

4

Hmm…

There is an implementation of dtostrf there, but it looks like it wasn’t exposed. I think it is possible to add an #include <stdlib.h> to your application, but it might not have everything.

In this case as well I think you can use the more ‘arduino-y’:

explicit String(double, int decimalPlaces=6);

Which would look something like:

double foo = 3.14159;
String piStr = String(foo);

Thanks!
David