Re: [PHP] Division by 0

Looks to me like you are closing your form before you put anything in 
it.  Therefore, the loan_amount is not set making the value 0.  Follow 
the math, and you are dividing by 1-1.

Change this line:

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post"></form>

to:

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">

and you should be good to go.

Joseph

Gary wrote:
> I have a mortgage amortization script that was working fine,now it seems to 
> have gone awry. Below is the entire script plus input page.  I am getting an 
> error
>
> Warning: Division by zero in 
> /home/content/J/a/y/Jayski/html/one2one/Ricksrecursivefunctions.php on line 
> 47
>
> Which is  (pow($intCalc,$totalPayments) - 1);
>
> Frankly I am not even sure the information is being passed to the script.
>
> Anyone see what I am missing?
>
> Gary
>
>
> <div id="onecol">Calculate your Loan</div>
> <div id="leftcontent">
>
> <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post"></form>
> <table>
>  <tr>
>       <td style="background-color:#B1D8D8" width="110px">Loan Amount</td>
>         <td><input name="loan_amount" type="text" size="25" /> USD</td>
>         <td><a href="javascript:void(0);"  onmouseover="Tip('This is the 
> amount of money to be loaned.')" onmouseout="UnTip()"><img 
> src="images/help.png" class="noborder"/></a></td>
>   </tr>
> <tr>
>       <td style="background-color:#B1D8D8" width="110px">Type of Loan</td>
>       <td>
> <select name="type" size="1" id="type">
>   <option>Installment</option>
>   <option>Balloon</option>
> </select></td>
> <td><a href="javascript:void(0);"  onmouseover="Tip('This is the method of 
> repayment.')" onmouseout="UnTip()"><img src="images/help.png" 
> class="noborder"/></a></td>
>   </tr>
>    <tr>
>      <td style="background-color:#B1D8D8" width="100px">Term of Loan</td>
>         <td><input name="loan_term" type="text" size="5" />
> </select>Months</td>
> <td><a href="javascript:void(0);"  onmouseover="Tip('This is the amount of 
> time that the money is loaned for.')" onmouseout="UnTip()"><img 
> src="images/help.png" class="noborder" /></a></td>
>         </tr>
>      <tr>
>      <td style="background-color:#B1D8D8" width="140px">Interest Rate</td>
>         <td><input name="int_rate" type="text" size="10" /> Per 
> Annum</td><td><a href="javascript:void(0);"  onmouseover="Tip('Percentage 
> (%) charged on loan on an annual basis. <br />Please see our FAQs for 
> information on usury rates. <br />If no amount is entered this will be 
> 0%.')" onmouseout="UnTip()"><img src="images/help.png" class="noborder" 
> /></a></td>
>         </tr>
> </table>
> <label>
> <input type="submit" name="submit" id="submit" value="submit" />
>     </label>
> </form>
> <?php
>
> function amortizationTable($paymentNum, $periodicPayment, $balance,
>                            $monthlyInterest) {
>     $paymentInterest = round($balance * $monthlyInterest,2);
>     $paymentPrincipal = round($periodicPayment - $paymentInterest,2);
>     $newBalance = round($balance - $paymentPrincipal,2);
>     print "<tr>
>            <td>$paymentNum</td>
>            <td>\$".number_format($balance,2)."</td>
>            <td>\$".number_format($periodicPayment,2)."</td>
>            <td>\$".number_format($paymentInterest,2)."</td>
>            <td>\$".number_format($paymentPrincipal,2)."</td>
>            </tr>";
>      # If balance not yet zero, recursively call amortizationTable()
>      if ($newBalance > 0) {
>         $paymentNum++;
>         amortizationTable($paymentNum, $periodicPayment, $newBalance,
>                           $monthlyInterest);
>      } else {
>         exit;
>      }
> } #end amortizationTable()
>
>    # Loan balance
>    $balance =($_POST['loan_amount']);
>
>    # Loan interest rate
>    $interestRate = ($_POST['int_rate']);
>
>    # Monthly interest rate
>    $monthlyInterest = ("$interestRate / 12");
>
>    # Term length of the loan, in years.
>    $termLength =($_POST['loan_term']);
>
>    # Number of payments per year.
>    $paymentsPerYear = 12;
>
>    # Payment iteration
>    $paymentNumber =($_POST['loan_term']);
>
>    # Perform preliminary calculations
>    $totalPayments = $termLength * $paymentsPerYear;
>    $intCalc = 1 + $interestRate / $paymentsPerYear;
>    $periodicPayment = $balance * pow($intCalc,$totalPayments) * ($intCalc - 
> 1) /
>                                     (pow($intCalc,$totalPayments) - 1);
>    $periodicPayment = round($periodicPayment,2);
>
>    # Create table
>    echo "<table width='50%' align='center' border='1'>";
>    print "<tr>
>           <th>Payment
>     Number</th><th>Balance</th>
>           <th>Payment</th><th>Interest</th><th>Principal</th>
>           </tr>";
>
>    # Call recursive function
>    amortizationTable($paymentNumber, $periodicPayment, $balance, 
> $monthlyInterest);
>
>    # Close table
>    print "</table>";
>
> ?>
> </div> 
>
>
>
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