jackbenny/interest-on-interest
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Jack-Benny Persson 2014-06-15 14:28:20 +02:00
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LICENSE Normal file
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Copyright (C) 2014 Jack-Benny Persson <jack-benny@cyberinfo.se>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

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README.md Normal file
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# Interest On Interest #
This is a simple function I've made with PHP to calculate interest on interest.
It's nothing fancy at all, but maybe it will be useful to someone. I've made it
while learning PHP.
## Usage ##
First argument to the script is the amount of money on your savings account, the
second argument is the interest (without the percent sign) and the third
(optional) argument is the number of years. For example if you have 50.000 in
your savings account, and the interest is 3% and you want to know how much
money you will have after 8 years:
php interest.php 50000 3 8
Or if you've made the script executable you can run it as follow:
./interest 50000 3 8
If you leave out the number of years the script will calulate the savings after
one year.
## Copying ##
Copyright 2014 Jack-Benny Persson (jack-benny@cyberinfo.se)
This program is release under GNU GPL version 2, please see the LICENSE file
more information.

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interest.php Executable file
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#!/usr/bin/php
<?php
/* A simple function to calculate 'interest on interest' together with
a simple usage of the function.
Copyright 2014 - Jack-Benny Persson <jack-benny@cyberinfo.se>
Released under GNU GPL v.2 */
function InteOnInte($amount, $interest, $year=1)
{
$totalAmount = pow($interest / 100 + 1, $year) * $amount;
return $totalAmount;
}
function Usage()
{
print "Usage: php interest.php {amount to start with} {interest} [years]\n";
print "Example: php interest.php 50000 3 10\n\n";
print "Copyright 2014 - Jack-Benny Persson <jack-benny@cyberinfo.se>\n";
}
// Sanity check
if (!isset($argv[1]) || !isset($argv[2]))
{
print "Please enter amount and interest!\n";
Usage();
exit(1);
}
// Declare some variables
$money = $argv[1];
$inter = $argv[2];
// If the user entered years
if (isset($argv[3]))
{
$years = $argv[3];
$mySavings = InteOnInte($money, $inter, $years);
printf ("After %d years with %.2f%% interest on %.2f you will have %.2f\n",
$years, $inter, $money, $mySavings);
}
// If the user did not enter years
else
{
$mySavings = InteOnInte($money, $inter);
printf ("After 1 year with %.2f%% interest on %.2f you will have %.2f\n",
$inter, $money, $mySavings);
}
?>