Agfdhyk

I have two issues
1) How to show the answer on clicking show Answer button
2) how to switch from one question to other on clicking next button
here is the screenshoot of output I am getting

here is form html I have created which is woring perfectly fine

<label for="qnum">Select no.of questions:</label>

                    </div>

                     <div class = "col-75"><input type="number" id="qnum" name="que" value="1"  min="1" max="100"></div>

                     <br /><br />

               </div>

             <br />



        <div class="row">

              <div class="col-25">

                <label for="int">Select no. of Integers:</label></div>

                    <div class="col-75">

                       <select name="select" id="int">

                        <option value="2"> 2 </option>

                        <option value="3"> 3 </option>

                        <option value="4"> 4 </option>

                        <option value="5"> 5 </option>

                        <option value="6"> 6 </option>

                        <option value="7"> 7 </option>

                        <option value="8"> 8 </option>

                        <option value="9"> 9 </option>

                        <option value="10"> 10 </option>

                      </select>

                    </div>

      </div>

      <br /> 



       <div class="row">

           <div class="col-25">

             <label for="dig">Select no. of digits:</label></div>

                <div class="col-75">

                  <select name="digits" id="dig">

                   <option value="1"> 1 digit</option>

                   </select>

              </div>

              <br /><br /><br /><br />

        </div>



          <div class="row">

          <div class="col-25"><label>Select operations:</label><br /></div>

              <div class="col-75">

                <input type="checkbox" id="mix" value="all" class="toggle-button"><label>All</label>

                <input type="checkbox" id="add" name="operation" value="Addition" checked><label>Addition</label>

                <input type="checkbox" id="sub" name="operation" value="Subtraction"><label>Subtraction</label>

                <input type="checkbox" id="mult" name="operation" value="Multiplication"><label>Multiplication</label>

                <input type="checkbox" id="div" name="operation" value="Division"><label>Division</label>

               </div>

                <br /><br />

                <br /><br />

            </div><br />





        <input type="submit" name="submit" value="Generate" id = "gen"><br>

        <input type="submit" name="play" value="Play" id="play">

        <br /><br><br><br>



      </form>

   </div>



     <script>

      $( '.col-75 .toggle-button' ).click( function () {

          $( '.col-75 input[type="checkbox"]' ).prop('checked', this.checked)

      })

        </script>

here the expressions are generating randomly which is perfectly fine for my purpose.
And here is my php code which is also woring perfectly fine
but in screenshot the input is given for only 2 questions thats whys its showing 2 questions but in my case there can bemany question depends on input given by user(max limit of questions is 100).
How can I do fix those 2 issues I have mentioned abobe?

//display sequence having only single digit numbers

if($_POST['digits'] == 1)

     {

        $q = $_POST['que'];

             $previousInt = null;        //Track the previous operand

             $s = $_POST['select'];



                     for ($x = 1; $x<=$q; $x++) //for loop for no. of questions

                        {

                           $randomOperands = array();

                            $randomOperators = array();



                                    // loop over $i n times

                                   for ($i = 1; $i <=$s; $i++) //for loop for no. of integers user entered

                                     {

                                        $nextInt = rand(1, 9); // assign random operand to array slot

                                         $randomOperands = $nextInt;

                                            if($i < $s)

                                             {   

                                               if($previousInt === 0) //No operator after last opearnd

                                                  {

                                                 //avoid division-by-zero

                                                   $randomOperators = $rOperators[rand(0, 2)];

                                                  }

                                                else

                                                  {

                                                   $randomOperators = $rOperators[rand(0, $N-1)];

                                                  } 

                                              }  

                                        $previousInt = $nextInt;

                                      }

                                    // print array values

                                      $exp = '';  

                                      $output_string = " ";

                                          //Generating the expression

                                           foreach($randomOperands as $key=>$value1)

                                         {

                                          $exp .=  $value1 . "" ;

                                             $output_string .= $value1. "<br>";

                                             if(isset($randomOperators[$key]))

                                                {

                                                 $exp .=  $randomOperators[$key]  ."";

                                                  $output_string .= $randomOperators[$key]."<br>";

                                                }



                                         }

                                          //print expression

                                          $res = eval("return ($exp);");//evaluate the expression





                                     ?><center> <?php echo ("This is Q(".$x."): <br>"), $output_string. "<br>________<br>";

                                     ?><br>

                                      <input type="button" name="show" value="Show Answer"><?php echo $res."<br>"; ?><br>

                                     <input type="button" name="next" value="Next" id="butn"><br><br>

                                     </center>



                        <?php



                      }



        }

  }

  ?>

Please help me. How can I fix it ?