Library Virtual wire

Projects Programming
1

I have a pretty big scetch running perfectly , used to read a number of sensors.
So far so good . Now I want to include an RF-transmitter , and for that purpose
I need to include the Virtual wire library ... but then happens something bisarre ...

Before ... working well :

#include <DHT.h>
#include <Time.h>
#include <Wire.h>

After , :

#include <Virtualwire.h>
#include <DHT.h>
#include <Time.h>
#include <Wire.h>

The compiler stops at this instruction far down in the scetch :

if abs((value-result)>0.01)

with the error message : expected ´(´ before ábs´ ...

Evidently the Virtual wire library is here incompatible ...but why?

2

Evidently the Virtual wire library is here incompatible ...but why?

No, it isn't. That line is in error (missing an open paren) whether you include VirtualWire, or not.

3

No , I just told you , the scetch works perfectly well ... until I include
the Virtualwire ...

4 
if abs((value-result)>0.01)

Is invalid.
Fix it.