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Re^3: How to split an integer??

by tobyink (Abbot)
on Dec 06, 2012 at 10:39 UTC ( #1007526=note: print w/replies, xml ) Need Help??

in reply to Re^2: How to split an integer??
in thread How to split an integer??

I prefer the regular expression to numeric comparison, because...

use strict; my $var = "xyz"; print "it's a single-digit number!!\n" if $var < 10;

Is "xyz" really a single digit number?

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

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Re^4: How to split an integer??
by nithins (Sexton) on Dec 06, 2012 at 10:51 UTC

    But my qn is i have a variable say $a= 23 , now i need to add it as 2+3 which should give me ans 5 ... hw to do this ???

    23 s stored as a single byte hence i cant split. But in words we can split character by character of a word in an array

    my @a = qw (data); foreach $aa(@a){ print $aa."\n"; }

    the above code will not work the sane for integers

      "23 s stored as a single byte hence i cant split."

      Byte?! You're thinking in C terms! Go wash your mouth out with soap right now! ;-)

      In Perl, strings and integers are both represented by the same data type - scalars. (Internally Perl represents scalars as a C struct which has separate string and integer slots. But you don't normally need to worry about such concerns.) If you have a variable that contains an integer value, such as 23, and pass it to something that expects a string, like split, that integer will be silently converted to a string.

      Here's exactly the same function I posted before, only now I'm using the integer 23 as the input...

      use 5.010; use strict; use warnings; # 23 is an integer. # say digit_sum(23); # This expression is used to test that a string consists of a single # digit. We use it a couple of different places, so we'll get define # it once here. # use constant DIGIT => qr/^[0-9]$/; # This is the function which adds digits # sub digit_sum { my $string = shift; # Otherwise, split into digits. my @digits = grep { $_ =~ DIGIT } # keep only the numeric characters split '', $string; # split into characters # Add the digits together. my $sum = 0; $sum += $_ for @digits; # Handle the trivial case. # If $sum is just a single digit, return it as-is. return $sum if $sum =~ DIGIT; # Otherwise, recurse. return digit_sum($sum); }
      perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
      my $number = 23; my @bits = split //, $number; my $total; for my $bit (@bits) { $total += $bit; } print "Number=$number Total=$total\n";
      For splitting integer value, need to specify pattern explicitly as null string as follows.
      # $number contains numerical value which is greater than 9 split('', $number);

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