Initial commit

interest.php

@@ -0,0 +1,50 @@
+#!/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);
+}
+
+?>