Initial commit

LICENSE

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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

README.md

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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.

interest.php

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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);
+}
+
+?>