IT 116: Introduction to Scripting

IT 116: Introduction to Scripting
Class 9 Exercise

Practice in interactive mode

Run Idle on your machine
```
python3
```

Write a while loop

>>> numb = 0
>>> while numb < 10:
...     numb = numb + 1
...
>>> numb

Write a while loop to add the numbers from 1 to 100

>>> num = 0
>>> total = 0
>>> while num <= 100:
...     num = num + 1
...     total = total + num
...
>>> total
5151

Write a data validation loop

>>> done = False
>>> while not done:
...     num = int(input('Please enter a number greater than 0: '))
...     if num > 0:
...             done = True
...     else:
...             print(num, 'is not greater than 0')
...

Write an infinite loop
```
>>> while True:
...    print("Are we there yet?")
```
You many have to hit Control C many times to stop this loop.

Script for this Exercise

Open a text editor
A program like Sublime.
Do not use Word or Notepad.
Copy the text below into the file

Save the file as ex9.py
Run this script in IDLE
Open the script file in IDLE. Under the Run menu, select Run Module.

You should see something like this

Entering while loop
number: 0
number: 1
number: 2
number: 3
Left while loop
number: 4

The sum of all the numbers from 1 to 100 is 5050

Are we there yet? no
Are we there yet? no
Are we there yet? no
Are we there yet? yes
Yeah!

Please enter an integer greater than 0: -1
-1 is not greater than 0
Please enter an integer greater than 0: 0
0 is not greater than 0
Please enter an integer greater than 0: 5
5

Unix Setup

Log in to users3.cs.umb.edu
You will be in your home directory.
Go to your it116 directory
```
cd it116
```
Go to your ex directory
```
cd ex
```
Create a directory for this exercise
```
mkdir  ex9
```
Check that the directory was created
```
ls
```

Copy the file to Unix

Open FileZilla and connect to users3.cs.umb.edu
You will have to connect using your Unix username and password.
Copy the file to the to it116/ex/ex9

Testing the script on Unix

Connect to users3.cs.umb.edu
Use an ssh client.
Go to the directory for this exercise
```
cd  it116/ex/ex9
```
Run this script
```
python3 ex9.py
```

You should see something like this

Entering while loop
number: 0
number: 1
number: 2
number: 3
Left while loop
number: 4

The sum of all the numbers from 1 to 100 is 5050

Are we there yet? no
Are we there yet? no
Are we there yet? no
Are we there yet? yes
Yeah!

Please enter an integer greater than 0: -1
-1 is not greater than 0
Please enter an integer greater than 0: 0
0 is not greater than 0
Please enter an integer greater than 0: 5
5

Running my test script on your script

If you want to run my text script on your Class Exercise script do the following
Run ex09.sh on your script
```
~ghoffman/it116_test/ex09.sh
```
The script will prompt you for your Unix username.