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use strict;
use warnings;

...
my $num = 999999999;
print sprintf("%f\n",$num);
print sprintf("%d\n",$num);

$string might be a phone number: 99999999999999999999999999       # se
+e Note 2
$string2 might be a phone number: 9-999-999-999-999-999-999-999-9999 #
+ also see Note 2
stiller's snippet:
999999999.000000  # a float, as stiller noted, this address's OP's pro
+blem,
999999999         # whereas, Perl makes it easy to use this as a strin
+g