[amibroker] Simple function help please !

["gosub283" <gosub283@xxxxxxxxx>]

Hi,

I'm trying to add 2 functions to my current project
but I continue to get a syntax error when executing.
I have drasticly simplified my functions for this
message but the error still occurs with this simple
code. The syntax error pointer always appears
under the first fuction call "Calc_1(5).
Can anyone tell me what is the syntax error in
this code ?
Thanks a lot....
Gosub283
============================

TestNumber = 1;

NewNumber = IIf( TestNumber >=0 , Calc_1(5), Calc_2(5)); 
                                ++++++++++++
 function Calc_1(number)
{
   //Test should return "10"
   return number * 2
}

 function Calc_2(number)
{
    //Test should return (-10)	
   return number * -2;
}



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