Browse - Programming Tips - How do I convert a text (ASCII) string to an integer?

Date: 2009nov26
Language: perl

Q.  How do I convert a text (ASCII) string to an integer?

A.  This does the trick;

$text = '123';
$n = $text + 0;

But you should check that $text is a valid number.  Attempts to turn
non-numbers (eg 'hello') into numbers gives you 0.  This function gives
undef for non-numbers.

sub asciiToInt($)
{
	my($text) = @_;
	my($n);

	if ($text =~ m/^\d+$/)
	{
		$n = $text + 0;
	}

	return $n;
}

There is also hex() and oct() for converting base 16 and 8 numbers strings
into numbers.