#!/usr/bin/perl

main();
sub main
{
    my ($num,$prec)=@ARGV;
    my ($mant,$dec) = split (/\./,$num);
    $dec=$dec?$dec:"0";
    $mant=~s/^(-?)0+/$1/;
    $mant=!$mant?0:$mant;
    ($prec,$dec)=$prec==0?($prec,undef):($prec+1,substr($dec,0,$prec+1));
    $dec=~s/$dec/length($dec)<$prec?$dec."0"x($prec-length($dec)):$dec/e;
    my $round = join ("",($mant,length($dec)?".":"",round($dec)));
    output ($round);
}
sub round
{
    my $dec=shift;
    $dec=~s/(\d)(\d)$/$2<5?$1:$1+1/e;
    $dec;
}

sub output
{
    print "Round = ",shift,"\n";
}