Due Date: This lab will be performed in lab sessions on Monday, January 25, 2021.

This lab should be done by every student. You can ask the instructor or your TA or other students in the class for help.

Educational goals of this lab - verify that every student can

• install Python on their personal machine
• use a Python IDE of their choice to create and run a program in Python

IF YOU NEED HELP

• How to download and install Python and Wing
• There is also a video on Canvas 115 front page, under "Pages" which does the same thing, how to install.
• how to run Python (IDLE) or
• how to run Python (Wing).
• (Also available as a video Entering and running a Python program (in 2 IDEs)"Entering and running a Python program")

Saving Files: On your computer you can save a file where you wish, but it is a good idea to make a folder for your CS 115 work, to make it easy to find. Or you can save a file on a memory stick or a Cloud storage account (like Dropbox) or email it to yourself.

INSTRUCTIONS:

• (10 points total) Problem: Getting a Python program to run
  • (10 points) Make sure you demonstrate that you can run the program below to Dr. Keen or your TA before you leave the lab session (Zoom meeting). This is how you get the 10 points!
  • On your machine, run your choice of Python IDE (IDLE or Wing or other).
  • Copy and paste the Python program below into a NEW FILE using the IDE editor of your choice. The program is everything between the two horizontal lines on the page.
  • Execute it with the Run button.

    ---

    # Prolog
    # Author:  YOUR NAME
    # Email:  YOUR EMAIL @uky.edu
    # Section: YOUR SECTION
    # Date: 1/25/21
    '''
      Purpose: to find the circumference and area of a circle given the diameter. 
      Preconditions: (input)
        User supplies the diameter as float number
      Postconditions: (outputs)
        User greeted and prompted for input of the diameter 
        Circumference and area of the circle is reported
      Reference https://www.mathsisfun.com/geometry/circle.html
        for formula of circumference and area
    
    '''
    from math import pi  # the famous 3.14159... to 15 places!
    
    def main():
    # Design and implementation
    
       #  1.  Output a message to identify the program
       print("Calculating circumference and area of a circle\n")
    
       #  2.  Input diameter from user
       diameter = float(input("Enter diameter (m): "))
    
       #  3.  Calculate radius from diameter, half the diameter
       radius = diameter / 2
    
       #  4.  Calculate area  in square meters
       area = pi * radius ** 2   # ** means raise to a power
    
       #  5.  Calculate the circumference of the circle (in meters)
       circum =  pi *  diameter  
    
       #  6. Output resulting circumference, area, and inputs 
       print()
       print("The radius of a circle with a diameter of {:.3f} m".format(diameter))
       print("is {:.3f} m".format(radius))
       print()
       print("The circumference of the circle is {:.3f} m".format(circum),
           "and the area is {:.3f} square m".format(area))
    
    main()
    # end of program file
    

    ---

  • The Test Cases

    Here are some test cases for the program. You should run your program with the numbers given below and make sure it comes out with the answers displayed in the test cases. If not, go back and check your program for mistakes.
    The bold, italicized text is what the user types in while the program is running.
    Test Case 1:

    Calculating circumference and area of a circle
    
    Enter diameter (m): 1
    
    The radius of a circle with a diameter of 1.000 m
    is 0.500 m
    
    The circumference of the circle is 3.142 m and the area is 0.785 square m
    

    
    Test Case 2:

    Calculating circumference and area of a circle
    
    Enter diameter (m): 100
    
    The radius of a circle with a diameter of 100.000 m
    is 50.000 m
    
    The circumference of the circle is 314.159 m and the area is 7853.982 square m
    

    
    Test Case 3:

    Calculating circumference and area of a circle
    
    Enter diameter (m): 5.0
    
    The radius of a circle with a diameter of 5.000 m
    is 2.500 m
    
    The circumference of the circle is 15.708 m and the area is 19.635 square m
    

  You don't have to save this program file unless you want to. There is no file submission for this assignment. Make sure your demonstration is witnessed during the lab! That is how you get 10 points.