Let's write a program that keeps state.
Aaron says:
a) guess the number program
b) input is a number
c) state is: the secret number (may change after win/lose)
wins, losses (these are numbers)
attempts failed in a current game
Let's write a program that keeps track of your account balance.
Write a program:
#!/usr/bin/perl
use CGI;
$car = new CGI;
print "Content-type: text/html\n\n";
# print $car->header, $car->start_html;
print qq{
};
print "";
Call this program type 34 and push Proceed, the url changes:
http://silo.cs.indiana.edu:8346/cgi-bin/0915/two?amount=34
So this program prints a form that collects data for it.
We change the program as follows:
#!/usr/bin/perl
use CGI;
$car = new CGI;
$amount = $car->param('amount');
$balance = $car->param('balance') + $amount;
print "Content-type: text/html\n\n";
# print $car->header, $car->start_html;
print qq{
};
print "";
This works but is kind of ugly. But it works. So we can clean it later.
Please try to solve the challenge stated in lab for Thursday.
I write it here again from the Prereqs for this week:
Challenge One. Implement a script that
* first asks for the name,
* then collects it and uses it to
* ask for the age,
* then collects the age and
* finally prints the final report.
Here's a model for it (not much help, I am sure).
-bash-3.2$ ./three
Welcome to the program.
What's your name: Larry Bird
Well Larry Bird how old are you now: 17
Well Larry Bird next year you will be 18 years old
-bash-3.2$ cat three
#!/usr/bin/python
print "Welcome to the program."
name = raw_input("What's your name: ")
age = raw_input("Well " + name + " how old are you now: ")
print "Well", name, "next year you will be", int(age) + 1, "years old"
-bash-3.2$
So we need to do this, but on the web. Write a web script with this behaviour.