while($count > 0) { 
    $xpos = 0; 
    $ypos = 0; 
 
    #Inner loop to perform each step of a random walk                                                                                
    for ($i = $NO_OF_STEPS; $i > 0; $i--) 
    { 
        $random_num = rand(); 
        #Storing xpos, ypos into designated arrays                                                                                   
        $xposArr[$i] = $xpos; 
        push(@yposArr, $ypos); 
        if($random_num < 0.25) { 
            $xpos--; 
        } elsif ($random_num < 0.5) { 
            $xpos++; 
        } elsif ($random_num < 0.75) { 
            $ypos--; 
        } else { 
            $ypos++; 
        } 
    } 
 
    #Inner loop when walker hits a target                                                                                        
    for ($i = $NO_OF_STEPS; $i > 0; $i--) 
    { 
        $random_num = rand(); 
        $xposArr[$i] = $xpos; 
        push(@yposArr, $ypos); 
        if($random_num == $n) 
        { 
            print "xpos $xpos\t ypos $ypos\t Hit by target\n"; 
        } 
    }