jackbenny/interest-on-interest
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Added some code for browser usage

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Jack-Benny Persson 2014-06-17 19:03:10 +02:00
parent 45bfa311a1
commit 8c989afa29
2 changed files with 63 additions and 29 deletions
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14
README.md
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@ -4,6 +4,9 @@ It's nothing fancy at all, but maybe it will be useful to someone. I've made it
while learning PHP. while learning PHP.
## Usage ## ## Usage ##
The script can be run both from a browser and from the terminal.
### CLI usage ###
First argument to the script is the amount of money on your savings account, the 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 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 (optional) argument is the number of years. For example if you have 50.000 in
@ -12,13 +15,16 @@ money you will have after 8 years:
php interest.php 50000 3 8 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 If you leave out the number of years the script will calulate the savings after
one year. one year.
### Browser usage ###
Just put the script on a webserver with PHP and run access it from your browser.
Then fill in the form and hit 'Calculate' and the script will calculate your
savings for you.
Please note that the script does NOT do any form of data validation!
## Copying ## ## Copying ##
Copyright 2014 Jack-Benny Persson (jack-benny@cyberinfo.se) Copyright 2014 Jack-Benny Persson (jack-benny@cyberinfo.se)

78
interest.php
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@ -1,4 +1,3 @@
#!/usr/bin/php
<?php <?php
/* A simple function to calculate 'interest on interest' together with /* A simple function to calculate 'interest on interest' together with
a simple usage of the function. a simple usage of the function.
@ -11,40 +10,69 @@ function InteOnInte($amount, $interest, $year=1)
return $totalAmount; return $totalAmount;
} }
function Usage() function CLI_Usage()
{ {
print "Usage: php interest.php {amount to start with} {interest} [years]\n"; print "Usage: php interest.php {amount to start with} {interest} [years]\n";
print "Example: php interest.php 50000 3 10\n\n"; print "Example: php interest.php 50000 3 10\n\n";
print "Copyright 2014 - Jack-Benny Persson <jack-benny@cyberinfo.se>\n"; print "Copyright 2014 - Jack-Benny Persson <jack-benny@cyberinfo.se>\n";
} }
// Sanity check // If we are running from the terminal
if (!isset($argv[1]) || !isset($argv[2])) if (!array_key_exists("HTTP_USER_AGENT", $_SERVER))
{ {
print "Please enter amount and interest!\n"; // Sanity check
Usage(); if (!isset($argv[1]) || !isset($argv[2]))
exit(1); {
print "Please enter amount and interest!\n";
CLI_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);
}
} }
// Declare some variables // If we are running from a browser
$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 else
{ {
$mySavings = InteOnInte($money, $inter); print ("<!DOCTYPE html>\n" .
printf ("After 1 year with %.2f%% interest on %.2f you will have %.2f\n", "<html>\n<head><title>Intereset On Interest</title></head>\n<body>" .
$inter, $money, $mySavings); "<h1>Interest On Interest calculator</h1>\n" .
"<form method=\"GET\" action=\"$_SERVER[PHP_SELF]\">\n" .
"Money: <input type=\"text\" name=\"money\"><br />\n" .
"Interest: <input type=\"text\" name=\"interest\"><br />\n" .
"Years:<input type=\"text\" name=\"years\"><br />\n" .
"<input type=\"submit\" value=\"Calculate\">\n" .
"</form>\n<br />\n");
if (array_key_exists("money", $_GET) && array_key_exists("interest", $_GET)
&& array_key_exists("years", $_GET))
{
print ("After $_GET[years] years with $_GET[interest]% interest on " .
"$_GET[money] you will have ");
$savings = InteOnInte($_GET['money'], $_GET['interest'], $_GET['years']);
printf ("%.2f\n", $savings);
}
print "</body>\n</html>\n";
} }
?> ?>