Exercise 7-2 Enhance the Future Value application

1) Add a check box at the bottom of the first page that says: Compound Interest Monthly. If this box is checked, the interest should be calculated monthly instead of yearly, so you need to change the Future Value calculation to provide for that.

2)On the second page, display some text that indicates whether the interest is being calculated monthly or yearly.

Exercise 7-2 Enhance the Future Value application

1) Add a check box at the bottom of the first page that says: Compound Interest Monthly. If this box is checked, the interest should be calculated monthly instead of yearly, so you need to change the Future Value calculation to provide for that.

2)On the second page, display some text that indicates whether the interest is being calculated monthly or yearly.

//index.php

Future Value Calculator

Investment Amount: Yearly Interest Rate: Number of Years:

Compound Interest Monthly

///display_results.php

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 <= $years; $i++) { $future_value += $future_value * $interest_rate *.01; }

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

Future Value Calculator

Investment Amount:

Yearly Interest Rate:

Number of Years:

Future Value: