Instructions -

If a user enters an interest rate value of less than 1%, the user will see an error saying: Interest rate must be greater than 1%.

The Title of the application changes to Future Value Calculator Revised. The browser should look like this after the user enters a percentage lower than 1%:

Additionally, when the user enters three correct values, the browser should show the year only, not the month, day, and year, , and say This calculation was done in the year.. and look like the image below.

display_results.php -

// validate investment if ($investment === FALSE ) { $error_message = 'Investment must be a valid number.'; } else if ( $investment

} else if ( $interest_rate >= 15 ) { $error_message = 'Interest rate must be less than or equal to 15.'; // validate years

} else if ( $years === FALSE ) { $error_message = 'Years must be a valid whole number.'; } else if ( $years 30 ) { $error_message = 'Years must be less than 31.'; // set error message to empty string if no invalid entries } else { $error_message = ''; }

// if an error message exists, go to the index page if ($error_message != '') { include('index.php'); exit(); }

// calculate the future value $future_value = $investment; for ($i = 1; $i

// apply currency and percent formatting $investment_f = '$'.number_format($investment, 2); $yearly_rate_f = $interest_rate.'%'; $future_value_f = '$'.number_format($future_value, 2);

$now = new DateTime();

?>

Future Value Calculator

Investment Amount:

Yearly Interest Rate:

Number of Years:

Future Value:

This calculation was done on: format('m-d-Y'); ?>

index.php -

Future Value Calculator

Investment Amount:

Yearly Interest Rate:

Number of Years:

Future Value Calculator Revised Interest rate must be greater than one percent. Investment Amount: 1000 Yearly Interest Rate 0.9 Number of Years: 20 Calculate