> perldoc -q round

Found in C:\Perl\lib\pod\perlfaq4.pod
  Does Perl have a round() function?  What about ceil() and floor()?  Trig functions?

            Remember that int() merely truncates toward 0. For rounding to a
            certain number of digits, sprintf() or printf() is usually the
            easiest route.

                printf("%.3f", 3.1415926535);       # prints 3.142