Question in "comment()"

 

In "comment()", it prints out the number like "1.983625300", but what I want is it only print "1.9836" or "1.98". 

How can I do that? Thanks for your time and sorry about grammar. 

 
 Comment(DoubleToStr(1.983625300,4); //output 1.9836 
 Comment(DoubleToStr(1.983625300,2); //output 1.98
 Comment(DoubleToStr(1.983625300,Digits); //output digits as ChartSymbol   
Reason: