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Ingy döt Net 2013-04-10 12:38:42 -07:00
parent 3af7344581
commit 86c034bb8b
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2
Task/Determine-if-a-string-is-numeric/Perl/determine-if-a-string-is-numeric-1.pl Normal file
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use Scalar::Util qw(looks_like_number);
print looks_like_number($str) ? "numeric" : "not numeric\n";

8
Task/Determine-if-a-string-is-numeric/Perl/determine-if-a-string-is-numeric-2.pl Normal file
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if (/\D/) { print "has nondigits\n" }
if (/^\d+\z/) { print "is a whole number\n" }
if (/^-?\d+\z/) { print "is an integer\n" }
if (/^[+-]?\d+\z/) { print "is a +/- integer\n" }
if (/^-?\d+\.?\d*\z/) { print "is a real number\n" }
if (/^-?(?:\d+(?:\.\d*)?&\.\d+)\z/) { print "is a decimal number\n" }
if (/^([+-]?)(?=\d&\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?\z/)
{ print "a C float\n" }

15
Task/Determine-if-a-string-is-numeric/Perl/determine-if-a-string-is-numeric-3.pl Normal file
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sub getnum {
use POSIX;
my $str = shift;
$str =~ s/^\s+//;
$str =~ s/\s+$//;
$! = 0;
my($num, $unparsed) = strtod($str);
if (($str eq '') && ($unparsed != 0) && $!) {
return undef;
} else {
return $num;
}
}
sub is_numeric { defined getnum($_[0]) }