Problems with return statement in function

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  • mosesdinakaran@gmail.com
    #1

    Problems with return statement in function

    Hi everybody,

    Today I faced a problem where I am very confused and I could not
    solve it and I am posting here....

    My question is
    Is is possible to return a value to a particular function

    The question may be silly or even meaning less but
    please......... ...

    Below I have give a detailed description on why this question
    appears to me.

    Consider the following Code.

    function one()
    {
    $ret_val = three();
    echo "<br>RetVal:=". $ret_val;
    }
    function two($a,$b)
    {
    echo "<br>I am In function ".__FUNCTION__. "()";
    if($a==$b)
    return true;
    else
    return false;
    }
    function three()
    {
    $array_one= array(1,2,3,4,5 );
    $array_two= array(1,2,3,4,5 );
    $a = array_rand($arr ay_one,1);
    $b = array_rand($arr ay_two,1);
    if(two($a,$b))
    {
    $ret_val = "$a and $b are equal";
    echo "<br><br>I am In function ".__FUNCTION__. "() and the
    Val is $ret_val<br>";
    return $ret_val;
    }
    else
    {
    three();
    }

    }
    one();

    Whats happpening here is.

    1) I have three functions named one() two() and three();
    2) From the first function one() I am calling function three()
    3) In function three I have two arrays named $array_one and
    $array_two
    4) Then I am getting a random value from this two arrays as $a,$b
    5) Then the function two is called to check weathe this two
    random value is equal or not if the values are equal it returns true
    else false
    6) Function three is called recursly till the random value $a
    and $b are equal. If it is equal I need to return the two values to
    function one()
    7) At one time $a and $b will be equal at this moment I return a
    variable $ret_val from function three() to function one()
    8) So In function one I can get the $ret_val

    But I could not get the value $ret_val in function one()
    I dont know why........
    To my surprise at some rare condition I can get the value in
    function one() all the othe times the return value is empty I could not
    find this rare condition also.

    I have spend a lot of time to find what is happening but in
    vain..........

    What I need is..

    I should return the value $ret_val from function three() to
    function one() But it is not happening I dont know weather the value
    has been returned to function three() or to function two()


    Can any body please help........... ...

    regards
    moses

    Tags: None
    • Kimmo Laine
      #2
      Re: Problems with return statement in function

      <mosesdinakaran @gmail.comwrote in message
      news:1161156743 .321309.53790@k 70g2000cwa.goog legroups.com...
      Hi everybody,
      >
      Today I faced a problem where I am very confused and I could not
      solve it and I am posting here....
      >
      My question is
      Is is possible to return a value to a particular function
      >
      The question may be silly or even meaning less but
      please......... ...
      >
      Below I have give a detailed description on why this question
      appears to me.
      >
      Consider the following Code.
      >
      function one()
      {
      $ret_val = three();
      echo "<br>RetVal:=". $ret_val;
      }
      function two($a,$b)
      {
      echo "<br>I am In function ".__FUNCTION__. "()";
      if($a==$b)
      return true;
      else
      return false;
      }
      function three()
      {
      $array_one= array(1,2,3,4,5 );
      $array_two= array(1,2,3,4,5 );
      $a = array_rand($arr ay_one,1);
      $b = array_rand($arr ay_two,1);
      if(two($a,$b))
      {
      $ret_val = "$a and $b are equal";
      echo "<br><br>I am In function ".__FUNCTION__. "() and the
      Val is $ret_val<br>";
      return $ret_val;
      }
      else
      {
      three();
      NOTE: This should be: return three();
      }
      >
      }
      one();
      >
      Whats happpening here is.
      >
      1) I have three functions named one() two() and three();
      2) From the first function one() I am calling function three()
      3) In function three I have two arrays named $array_one and
      $array_two
      4) Then I am getting a random value from this two arrays as $a,$b
      5) Then the function two is called to check weathe this two
      random value is equal or not if the values are equal it returns true
      else false
      6) Function three is called recursly till the random value $a
      and $b are equal. If it is equal I need to return the two values to
      function one()
      7) At one time $a and $b will be equal at this moment I return a
      variable $ret_val from function three() to function one()
      8) So In function one I can get the $ret_val
      >
      But I could not get the value $ret_val in function one()
      I dont know why........
      >
      I should return the value $ret_val from function three() to
      function one() But it is not happening I dont know weather the value
      has been returned to function three() or to function two()

      When you call three() recursively, you're not returning the value there.
      When you call two in the other branch, you are returning the value there,
      but it's lost since you've broken the chain of returns when calling three.
      It goes something like this:

      one() calls three(), prints what three() returns
      three() calls three(), returns nothing
      three() calls three(), returns nothing
      three() calls three(), returns nothing
      three() calls three(), returns nothing
      .... at some point random matches and...
      three() calls two(), returns $retval


      It should be
      one() calls three, prints what three() returns
      three() calls three(), returns what three() returns
      three() calls three(), returns what three() returns
      ....
      three() calls two(), returns $retval

      so that $retval can make it back to one(). Kudos on using recursion, you
      just missed a tiny little detail... Always return a recursive funtion call.

      --
      "Ohjelmoija on organismi joka muuttaa kofeiinia koodiksi" - lpk
      http://outolempi.net/ahdistus/ - Satunnaisesti päivittyvä nettisarjis
      spam@outolempi. net | rot13(xvzzb@bhg byrzcv.arg)


        Comment

        • mosesdinakaran@gmail.com
          #3
          Re: Problems with return statement in function

          Hi Kimmo

          Thanks for ur help

          I have learned a great lesson from u........

          Always return a recursive funtion call


          regards
          moses



          Kimmo Laine wrote:
          <mosesdinakaran @gmail.comwrote in message
          news:1161156743 .321309.53790@k 70g2000cwa.goog legroups.com...
          Hi everybody,

          Today I faced a problem where I am very confused and I could not
          solve it and I am posting here....

          My question is
          Is is possible to return a value to a particular function

          The question may be silly or even meaning less but
          please......... ...

          Below I have give a detailed description on why this question
          appears to me.

          Consider the following Code.

          function one()
          {
          $ret_val = three();
          echo "<br>RetVal:=". $ret_val;
          }
          function two($a,$b)
          {
          echo "<br>I am In function ".__FUNCTION__. "()";
          if($a==$b)
          return true;
          else
          return false;
          }
          function three()
          {
          $array_one= array(1,2,3,4,5 );
          $array_two= array(1,2,3,4,5 );
          $a = array_rand($arr ay_one,1);
          $b = array_rand($arr ay_two,1);
          if(two($a,$b))
          {
          $ret_val = "$a and $b are equal";
          echo "<br><br>I am In function ".__FUNCTION__. "() and the
          Val is $ret_val<br>";
          return $ret_val;
          }
          else
          {
          three();
          >
          NOTE: This should be: return three();
          >
          }

          }
          one();

          Whats happpening here is.

          1) I have three functions named one() two() and three();
          2) From the first function one() I am calling function three()
          3) In function three I have two arrays named $array_one and
          $array_two
          4) Then I am getting a random value from this two arrays as $a,$b
          5) Then the function two is called to check weathe this two
          random value is equal or not if the values are equal it returns true
          else false
          6) Function three is called recursly till the random value $a
          and $b are equal. If it is equal I need to return the two values to
          function one()
          7) At one time $a and $b will be equal at this moment I return a
          variable $ret_val from function three() to function one()
          8) So In function one I can get the $ret_val

          But I could not get the value $ret_val in function one()
          I dont know why........

          I should return the value $ret_val from function three() to
          function one() But it is not happening I dont know weather the value
          has been returned to function three() or to function two()
          >
          >
          When you call three() recursively, you're not returning the value there.
          When you call two in the other branch, you are returning the value there,
          but it's lost since you've broken the chain of returns when calling three.
          It goes something like this:
          >
          one() calls three(), prints what three() returns
          three() calls three(), returns nothing
          three() calls three(), returns nothing
          three() calls three(), returns nothing
          three() calls three(), returns nothing
          ... at some point random matches and...
          three() calls two(), returns $retval
          >
          >
          It should be
          one() calls three, prints what three() returns
          three() calls three(), returns what three() returns
          three() calls three(), returns what three() returns
          ...
          three() calls two(), returns $retval
          >
          so that $retval can make it back to one(). Kudos on using recursion, you
          just missed a tiny little detail... Always return a recursive funtion call.
          >
          --
          "Ohjelmoija on organismi joka muuttaa kofeiinia koodiksi" - lpk
          http://outolempi.net/ahdistus/ - Satunnaisesti päivittyvä nettisarjis
          spam@outolempi. net | rot13(xvzzb@bhg byrzcv.arg)

            Comment

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