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Re: [PBML] Pass array to a subroutine

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  • Brad Lhotsky
    Perl list flattens your args in your sub routine call into one list which is accesible by @_ in the subroutine. The contents of that array are 1 2 3 aaa
    Message 1 of 11 , Jan 5, 2005
    • 0 Attachment
      Perl list flattens your args in your sub routine call into one list
      which is accesible by "@_" in the subroutine. The contents of that
      array are "1 2 3 aaa bbb". When you make the assignment:

      my (@list,$scalar) = @_;

      the @list variable consumes the entire list from its position onward,
      in this case, the beginning of the list.

      Recommended reading:

      perldoc perlintro
      perldoc perldata
      perldoc perlsub
      perldoc perldsc

      perldoc -q list

      On Wed, Jan 05, 2005 at 07:26:29PM +0530, lakshmi.sailaja@... wrote:
      >
      > Hello,
      >
      > As per your suggestion, I am to generate the correct output if used in
      > the following way:
      >
      > ---------------------------------------
      > my @arr = (1, 2, 3);
      >
      > xxx(@arr, "aaa", "bbb");
      >
      > sub xxx {
      > my ($str1, $str2, @arr) = @_;
      >
      > print "str1 is $str1\n";
      > print "str2 is $str2\n";
      > print "array is @arr\n";
      > }
      > ---------------------------------------
      >
      > Output: (CORRECT)
      > -------
      > str1 is aaa
      > str2 is bbb
      > array is 1 2 3
      >
      > But, when I try calling the following way i.e, I am passing array as
      > first parameter and then strings as the second and third parameter, the
      > o/p is not the correct value:
      >
      > ---------------------------------------
      > my @arr = (1, 2, 3);
      >
      > xxx(@arr, "aaa", "bbb");
      >
      > sub xxx {
      > my (@arr, $str1, $str2) = @_;
      >
      > print "str1 is $str1\n";
      > print "str2 is $str2\n";
      > print "array is @arr\n";
      > }
      > ---------------------------------------
      >
      > Output: (INCORRECT)
      > -------
      > str1 is
      > str2 is
      > array is 1 2 3 aaa bbb
      >
      > Can you please tell me why does the above method doesn't generate the
      > correct output? Please do provide a solution, if exists.
      >
      > Regards,
      > Lakshmi
      >
      > -----Original Message-----
      > From: Raghu Ram Murthy [mailto:me_rams@...]
      > Sent: Wednesday, January 05, 2005 6:03 PM
      > To: perl-beginner@yahoogroups.com
      > Subject: RE: [PBML] Pass array to a subroutine
      >
      >
      > sub xxx {
      > my ($str1, $str2, @arr) = @_;
      > }
      > my @arr = (1, 2, 3);
      > xxx("aaa", "bbb", @arr);
      >
      >
      > --- lakshmi.sailaja@... wrote:
      >
      > > Hello Raghuram,
      > >
      > > Can you please illustrate the below example by
      > > passing 2 strings along
      > > with the array to the subroutine?
      > >
      > > Regards,
      > > Lakshmi
      > >
      > > -----Original Message-----
      > > From: Raghu Ram Murthy [mailto:me_rams@...]
      > > Sent: Wednesday, January 05, 2005 5:28 PM
      > > To: perl-beginner@yahoogroups.com
      > > Subject: Re: [PBML] Pass array to a subroutine
      > >
      > >
      > > You can pass an array to a sub routine in two ways.
      > > One is passing entire array and another is passing
      > > the
      > > array reference.
      > >
      > > Passing array:
      > >
      > > sub give_me_array {
      > > my @values = @_;
      > > print "@values\n";
      > > }
      > >
      > > my @arr = ( 1, 2, 3 );
      > > give_me_array(@arr);
      > >
      > > Passing reference:
      > >
      > > sub give_me_array {
      > > my $values = shift;
      > > print "@$values\n";
      > > }
      > >
      > > my @arr = ( 1, 2, 3 );
      > > give_me_array(\@arr);
      > >
      > > Thanks & Regards
      > > -Raghuram
      > >
      > > --- lakshmi.sailaja@... wrote:
      > >
      > > > Hello,
      > > >
      > > > Can anyone please tell me the way I can pass an
      > > > array to a subroutine?
      > > >
      > > > It would be great if any code snippet is also
      > > > provided?
      > > >
      > > > Regards,
      > > > Lakshmi
      > > >
      > > >
      > >
      > >
      > > =====
      > > ----------------------------------------------
      > > P.Raghu Ram Murthy, M-tech (Computer Science),
      > > Member, Information Technology,
      > > D E Shaw India Software Private Limited,
      > > 6-3-879 & 879/B
      > > Begumpet, Hyderabad 500 016
      > > Andhra Pradesh
      > > India
      > >
      > > Mobile: (+91) 98852 17928
      > > ----------------------------------------------
      > >
      > > If it doesn't work, you're not hitting it with a big
      > > enough hammer
      > >
      > >
      > >
      > > __________________________________
      > > Do you Yahoo!?
      > > Take Yahoo! Mail with you! Get it on your mobile
      > > phone.
      > > http://mobile.yahoo.com/maildemo
      > >
      > >
      > > Unsubscribing info is here:
      > > http://help.yahoo.com/help/us/groups/groups-32.html
      > > Yahoo! Groups Links
      > >
      > >
      > >
      > >
      > >
      > >
      > >
      > >
      >
      >
      > =====
      > ----------------------------------------------
      > P.Raghu Ram Murthy, M-tech (Computer Science),
      > Member, Information Technology,
      > D E Shaw India Software Private Limited,
      > 6-3-879 & 879/B
      > Begumpet, Hyderabad 500 016
      > Andhra Pradesh
      > India
      >
      > Mobile: (+91) 98852 17928
      > ----------------------------------------------
      >
      > If it doesn't work, you're not hitting it with a big enough hammer
      >
      >
      >
      > __________________________________
      > Do you Yahoo!?
      > The all-new My Yahoo! - Get yours free!
      > http://my.yahoo.com
      >
      >
      >
      >
      > Unsubscribing info is here:
      > http://help.yahoo.com/help/us/groups/groups-32.html
      > Yahoo! Groups Links
      >
      >
      >
      >
      >
      >
      >
      >
      >
      > Unsubscribing info is here: http://help.yahoo.com/help/us/groups/groups-32.html
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      >
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    • Raghu Ram Murthy
      Then you must pass array reference, as I ve mentioned in my first mail. No other option. Thanks -Raghuram ... === message truncated === ... P.Raghu Ram Murthy,
      Message 2 of 11 , Jan 5, 2005
      • 0 Attachment
        Then you must pass array reference, as I've mentioned
        in my first mail. No other option.

        Thanks
        -Raghuram

        --- lakshmi.sailaja@... wrote:

        > Hello,
        >
        > As per your suggestion, I am to generate the correct
        > output if used in
        > the following way:
        >
        > ---------------------------------------
        > my @arr = (1, 2, 3);
        >
        > xxx(@arr, "aaa", "bbb");
        >
        > sub xxx {
        > my ($str1, $str2, @arr) = @_;
        >
        > print "str1 is $str1\n";
        > print "str2 is $str2\n";
        > print "array is @arr\n";
        > }
        > ---------------------------------------
        >
        > Output: (CORRECT)
        > -------
        > str1 is aaa
        > str2 is bbb
        > array is 1 2 3
        >
        > But, when I try calling the following way i.e, I am
        > passing array as
        > first parameter and then strings as the second and
        > third parameter, the
        > o/p is not the correct value:
        >
        > ---------------------------------------
        > my @arr = (1, 2, 3);
        >
        > xxx(@arr, "aaa", "bbb");
        >
        > sub xxx {
        > my (@arr, $str1, $str2) = @_;
        >
        > print "str1 is $str1\n";
        > print "str2 is $str2\n";
        > print "array is @arr\n";
        > }
        > ---------------------------------------
        >
        > Output: (INCORRECT)
        > -------
        > str1 is
        > str2 is
        > array is 1 2 3 aaa bbb
        >
        > Can you please tell me why does the above method
        > doesn't generate the
        > correct output? Please do provide a solution, if
        > exists.
        >
        > Regards,
        > Lakshmi
        >
        > -----Original Message-----
        > From: Raghu Ram Murthy [mailto:me_rams@...]
        > Sent: Wednesday, January 05, 2005 6:03 PM
        > To: perl-beginner@yahoogroups.com
        > Subject: RE: [PBML] Pass array to a subroutine
        >
        >
        > sub xxx {
        > my ($str1, $str2, @arr) = @_;
        > }
        > my @arr = (1, 2, 3);
        > xxx("aaa", "bbb", @arr);
        >
        >
        > --- lakshmi.sailaja@... wrote:
        >
        > > Hello Raghuram,
        > >
        > > Can you please illustrate the below example by
        > > passing 2 strings along
        > > with the array to the subroutine?
        > >
        > > Regards,
        > > Lakshmi
        > >
        > > -----Original Message-----
        > > From: Raghu Ram Murthy [mailto:me_rams@...]
        > > Sent: Wednesday, January 05, 2005 5:28 PM
        > > To: perl-beginner@yahoogroups.com
        > > Subject: Re: [PBML] Pass array to a subroutine
        > >
        > >
        > > You can pass an array to a sub routine in two
        > ways.
        > > One is passing entire array and another is passing
        > > the
        > > array reference.
        > >
        > > Passing array:
        > >
        > > sub give_me_array {
        > > my @values = @_;
        > > print "@values\n";
        > > }
        > >
        > > my @arr = ( 1, 2, 3 );
        > > give_me_array(@arr);
        > >
        > > Passing reference:
        > >
        > > sub give_me_array {
        > > my $values = shift;
        > > print "@$values\n";
        > > }
        > >
        > > my @arr = ( 1, 2, 3 );
        > > give_me_array(\@arr);
        > >
        > > Thanks & Regards
        > > -Raghuram
        > >
        > > --- lakshmi.sailaja@... wrote:
        > >
        > > > Hello,
        > > >
        > > > Can anyone please tell me the way I can pass an
        > > > array to a subroutine?
        > > >
        > > > It would be great if any code snippet is also
        > > > provided?
        > > >
        > > > Regards,
        > > > Lakshmi
        > > >
        > > >
        > >
        > >
        > > =====
        > > ----------------------------------------------
        > > P.Raghu Ram Murthy, M-tech (Computer Science),
        > > Member, Information Technology,
        > > D E Shaw India Software Private Limited,
        > > 6-3-879 & 879/B
        > > Begumpet, Hyderabad 500 016
        > > Andhra Pradesh
        > > India
        > >
        > > Mobile: (+91) 98852 17928
        > > ----------------------------------------------
        > >
        > > If it doesn't work, you're not hitting it with a
        > big
        > > enough hammer
        > >
        > >
        > >
        > > __________________________________
        > > Do you Yahoo!?
        > > Take Yahoo! Mail with you! Get it on your mobile
        > > phone.
        > > http://mobile.yahoo.com/maildemo
        > >
        > >
        > > Unsubscribing info is here:
        > >
        > http://help.yahoo.com/help/us/groups/groups-32.html
        > > Yahoo! Groups Links
        > >
        > >
        > >
        > >
        > >
        > >
        > >
        > >
        >
        >
        > =====
        > ----------------------------------------------
        > P.Raghu Ram Murthy, M-tech (Computer Science),
        > Member, Information Technology,
        > D E Shaw India Software Private Limited,
        > 6-3-879 & 879/B
        > Begumpet, Hyderabad 500 016
        > Andhra Pradesh
        > India
        >
        > Mobile: (+91) 98852 17928
        > ----------------------------------------------
        >
        > If it doesn't work, you're not hitting it with a big
        > enough hammer
        >
        >
        >
        > __________________________________
        > Do you Yahoo!?
        > The all-new My Yahoo! - Get yours free!
        > http://my.yahoo.com
        >
        >
        >
        === message truncated ===


        =====
        ----------------------------------------------
        P.Raghu Ram Murthy, M-tech (Computer Science),
        Member, Information Technology,
        D E Shaw India Software Private Limited,
        6-3-879 & 879/B
        Begumpet, Hyderabad 500 016
        Andhra Pradesh
        India

        Mobile: (+91) 98852 17928
        ----------------------------------------------

        If it doesn't work, you're not hitting it with a big enough hammer



        __________________________________
        Do you Yahoo!?
        Meet the all-new My Yahoo! - Try it today!
        http://my.yahoo.com
      • lakshmi.sailaja@wipro.com
        Thanks for the information. Regards, Lakshmi ... From: Brad Lhotsky [mailto:brad@divisionbyzero.net] Sent: Wednesday, January 05, 2005 8:27 PM To:
        Message 3 of 11 , Jan 5, 2005
        • 0 Attachment
          Thanks for the information.

          Regards,
          Lakshmi


          -----Original Message-----
          From: Brad Lhotsky [mailto:brad@...]
          Sent: Wednesday, January 05, 2005 8:27 PM
          To: perl-beginner@yahoogroups.com
          Subject: Re: [PBML] Pass array to a subroutine


          Perl list flattens your args in your sub routine call into one list
          which is accesible by "@_" in the subroutine. The contents of that
          array are "1 2 3 aaa bbb". When you make the assignment:

          my (@list,$scalar) = @_;

          the @list variable consumes the entire list from its position onward,
          in this case, the beginning of the list.

          Recommended reading:

          perldoc perlintro
          perldoc perldata
          perldoc perlsub
          perldoc perldsc

          perldoc -q list

          On Wed, Jan 05, 2005 at 07:26:29PM +0530, lakshmi.sailaja@...
          wrote:
          >
          > Hello,
          >
          > As per your suggestion, I am to generate the correct output if used in
          > the following way:
          >
          > ---------------------------------------
          > my @arr = (1, 2, 3);
          >
          > xxx(@arr, "aaa", "bbb");
          >
          > sub xxx {
          > my ($str1, $str2, @arr) = @_;
          >
          > print "str1 is $str1\n";
          > print "str2 is $str2\n";
          > print "array is @arr\n";
          > }
          > ---------------------------------------
          >
          > Output: (CORRECT)
          > -------
          > str1 is aaa
          > str2 is bbb
          > array is 1 2 3
          >
          > But, when I try calling the following way i.e, I am passing array as
          > first parameter and then strings as the second and third parameter,
          the
          > o/p is not the correct value:
          >
          > ---------------------------------------
          > my @arr = (1, 2, 3);
          >
          > xxx(@arr, "aaa", "bbb");
          >
          > sub xxx {
          > my (@arr, $str1, $str2) = @_;
          >
          > print "str1 is $str1\n";
          > print "str2 is $str2\n";
          > print "array is @arr\n";
          > }
          > ---------------------------------------
          >
          > Output: (INCORRECT)
          > -------
          > str1 is
          > str2 is
          > array is 1 2 3 aaa bbb
          >
          > Can you please tell me why does the above method doesn't generate the
          > correct output? Please do provide a solution, if exists.
          >
          > Regards,
          > Lakshmi
          >
          > -----Original Message-----
          > From: Raghu Ram Murthy [mailto:me_rams@...]
          > Sent: Wednesday, January 05, 2005 6:03 PM
          > To: perl-beginner@yahoogroups.com
          > Subject: RE: [PBML] Pass array to a subroutine
          >
          >
          > sub xxx {
          > my ($str1, $str2, @arr) = @_;
          > }
          > my @arr = (1, 2, 3);
          > xxx("aaa", "bbb", @arr);
          >
          >
          > --- lakshmi.sailaja@... wrote:
          >
          > > Hello Raghuram,
          > >
          > > Can you please illustrate the below example by
          > > passing 2 strings along
          > > with the array to the subroutine?
          > >
          > > Regards,
          > > Lakshmi
          > >
          > > -----Original Message-----
          > > From: Raghu Ram Murthy [mailto:me_rams@...]
          > > Sent: Wednesday, January 05, 2005 5:28 PM
          > > To: perl-beginner@yahoogroups.com
          > > Subject: Re: [PBML] Pass array to a subroutine
          > >
          > >
          > > You can pass an array to a sub routine in two ways.
          > > One is passing entire array and another is passing
          > > the
          > > array reference.
          > >
          > > Passing array:
          > >
          > > sub give_me_array {
          > > my @values = @_;
          > > print "@values\n";
          > > }
          > >
          > > my @arr = ( 1, 2, 3 );
          > > give_me_array(@arr);
          > >
          > > Passing reference:
          > >
          > > sub give_me_array {
          > > my $values = shift;
          > > print "@$values\n";
          > > }
          > >
          > > my @arr = ( 1, 2, 3 );
          > > give_me_array(\@arr);
          > >
          > > Thanks & Regards
          > > -Raghuram
          > >
          > > --- lakshmi.sailaja@... wrote:
          > >
          > > > Hello,
          > > >
          > > > Can anyone please tell me the way I can pass an
          > > > array to a subroutine?
          > > >
          > > > It would be great if any code snippet is also
          > > > provided?
          > > >
          > > > Regards,
          > > > Lakshmi
          > > >
          > > >
          > >
          > >
          > > =====
          > > ----------------------------------------------
          > > P.Raghu Ram Murthy, M-tech (Computer Science),
          > > Member, Information Technology,
          > > D E Shaw India Software Private Limited,
          > > 6-3-879 & 879/B
          > > Begumpet, Hyderabad 500 016
          > > Andhra Pradesh
          > > India
          > >
          > > Mobile: (+91) 98852 17928
          > > ----------------------------------------------
          > >
          > > If it doesn't work, you're not hitting it with a big
          > > enough hammer
          > >
          > >
          > >
          > > __________________________________
          > > Do you Yahoo!?
          > > Take Yahoo! Mail with you! Get it on your mobile
          > > phone.
          > > http://mobile.yahoo.com/maildemo
          > >
          > >
          > > Unsubscribing info is here:
          > > http://help.yahoo.com/help/us/groups/groups-32.html
          > > Yahoo! Groups Links
          > >
          > >
          > >
          > >
          > >
          > >
          > >
          > >
          >
          >
          > =====
          > ----------------------------------------------
          > P.Raghu Ram Murthy, M-tech (Computer Science),
          > Member, Information Technology,
          > D E Shaw India Software Private Limited,
          > 6-3-879 & 879/B
          > Begumpet, Hyderabad 500 016
          > Andhra Pradesh
          > India
          >
          > Mobile: (+91) 98852 17928
          > ----------------------------------------------
          >
          > If it doesn't work, you're not hitting it with a big enough hammer
          >
          >
          >
          > __________________________________
          > Do you Yahoo!?
          > The all-new My Yahoo! - Get yours free!
          > http://my.yahoo.com
          >
          >
          >
          >
          > Unsubscribing info is here:
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          > Yahoo! Groups Links
          >
          >
          >
          >
          >
          >
          >
          >
          >
          > Unsubscribing info is here:
          http://help.yahoo.com/help/us/groups/groups-32.html
          > Yahoo! Groups Links
          >
          >
          >
          >
          >
          >
          >


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        • lakshmi.sailaja@wipro.com
          Ok. Thank you Raghuram. Regards, Lakshmi ... From: Raghu Ram Murthy [mailto:me_rams@yahoo.com] Sent: Wednesday, January 05, 2005 8:54 PM To:
          Message 4 of 11 , Jan 5, 2005
          • 0 Attachment
            Ok. Thank you Raghuram.

            Regards,
            Lakshmi

            -----Original Message-----
            From: Raghu Ram Murthy [mailto:me_rams@...]
            Sent: Wednesday, January 05, 2005 8:54 PM
            To: perl-beginner@yahoogroups.com
            Subject: RE: [PBML] Pass array to a subroutine


            Then you must pass array reference, as I've mentioned
            in my first mail. No other option.

            Thanks
            -Raghuram

            --- lakshmi.sailaja@... wrote:

            > Hello,
            >
            > As per your suggestion, I am to generate the correct
            > output if used in
            > the following way:
            >
            > ---------------------------------------
            > my @arr = (1, 2, 3);
            >
            > xxx(@arr, "aaa", "bbb");
            >
            > sub xxx {
            > my ($str1, $str2, @arr) = @_;
            >
            > print "str1 is $str1\n";
            > print "str2 is $str2\n";
            > print "array is @arr\n";
            > }
            > ---------------------------------------
            >
            > Output: (CORRECT)
            > -------
            > str1 is aaa
            > str2 is bbb
            > array is 1 2 3
            >
            > But, when I try calling the following way i.e, I am
            > passing array as
            > first parameter and then strings as the second and
            > third parameter, the
            > o/p is not the correct value:
            >
            > ---------------------------------------
            > my @arr = (1, 2, 3);
            >
            > xxx(@arr, "aaa", "bbb");
            >
            > sub xxx {
            > my (@arr, $str1, $str2) = @_;
            >
            > print "str1 is $str1\n";
            > print "str2 is $str2\n";
            > print "array is @arr\n";
            > }
            > ---------------------------------------
            >
            > Output: (INCORRECT)
            > -------
            > str1 is
            > str2 is
            > array is 1 2 3 aaa bbb
            >
            > Can you please tell me why does the above method
            > doesn't generate the
            > correct output? Please do provide a solution, if
            > exists.
            >
            > Regards,
            > Lakshmi
            >
            > -----Original Message-----
            > From: Raghu Ram Murthy [mailto:me_rams@...]
            > Sent: Wednesday, January 05, 2005 6:03 PM
            > To: perl-beginner@yahoogroups.com
            > Subject: RE: [PBML] Pass array to a subroutine
            >
            >
            > sub xxx {
            > my ($str1, $str2, @arr) = @_;
            > }
            > my @arr = (1, 2, 3);
            > xxx("aaa", "bbb", @arr);
            >
            >
            > --- lakshmi.sailaja@... wrote:
            >
            > > Hello Raghuram,
            > >
            > > Can you please illustrate the below example by
            > > passing 2 strings along
            > > with the array to the subroutine?
            > >
            > > Regards,
            > > Lakshmi
            > >
            > > -----Original Message-----
            > > From: Raghu Ram Murthy [mailto:me_rams@...]
            > > Sent: Wednesday, January 05, 2005 5:28 PM
            > > To: perl-beginner@yahoogroups.com
            > > Subject: Re: [PBML] Pass array to a subroutine
            > >
            > >
            > > You can pass an array to a sub routine in two
            > ways.
            > > One is passing entire array and another is passing
            > > the
            > > array reference.
            > >
            > > Passing array:
            > >
            > > sub give_me_array {
            > > my @values = @_;
            > > print "@values\n";
            > > }
            > >
            > > my @arr = ( 1, 2, 3 );
            > > give_me_array(@arr);
            > >
            > > Passing reference:
            > >
            > > sub give_me_array {
            > > my $values = shift;
            > > print "@$values\n";
            > > }
            > >
            > > my @arr = ( 1, 2, 3 );
            > > give_me_array(\@arr);
            > >
            > > Thanks & Regards
            > > -Raghuram
            > >
            > > --- lakshmi.sailaja@... wrote:
            > >
            > > > Hello,
            > > >
            > > > Can anyone please tell me the way I can pass an
            > > > array to a subroutine?
            > > >
            > > > It would be great if any code snippet is also
            > > > provided?
            > > >
            > > > Regards,
            > > > Lakshmi
            > > >
            > > >
            > >
            > >
            > > =====
            > > ----------------------------------------------
            > > P.Raghu Ram Murthy, M-tech (Computer Science),
            > > Member, Information Technology,
            > > D E Shaw India Software Private Limited,
            > > 6-3-879 & 879/B
            > > Begumpet, Hyderabad 500 016
            > > Andhra Pradesh
            > > India
            > >
            > > Mobile: (+91) 98852 17928
            > > ----------------------------------------------
            > >
            > > If it doesn't work, you're not hitting it with a
            > big
            > > enough hammer
            > >
            > >
            > >
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            > =====
            > ----------------------------------------------
            > P.Raghu Ram Murthy, M-tech (Computer Science),
            > Member, Information Technology,
            > D E Shaw India Software Private Limited,
            > 6-3-879 & 879/B
            > Begumpet, Hyderabad 500 016
            > Andhra Pradesh
            > India
            >
            > Mobile: (+91) 98852 17928
            > ----------------------------------------------
            >
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            === message truncated ===


            =====
            ----------------------------------------------
            P.Raghu Ram Murthy, M-tech (Computer Science),
            Member, Information Technology,
            D E Shaw India Software Private Limited,
            6-3-879 & 879/B
            Begumpet, Hyderabad 500 016
            Andhra Pradesh
            India

            Mobile: (+91) 98852 17928
            ----------------------------------------------

            If it doesn't work, you're not hitting it with a big enough hammer



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