Problem Set 6
CIS 166 & CMP 230, Introductory Programming
Lehman College, City University of New York
Fall 2012

Due Date: midnight, Friday, 26 October.

This assignment focuses on functions from Chapter 6.

Submit the following programs via Blackboard:

1. (From Chapter 6, #1, Page 196) Write a program to print the lyrics of the song "Old MacDonald." Your program should print the lyrics for five different animals, similar to the example verse below.

   	   Old MacDonald had a farm, Ei-igh, Ee-igh, Oh!
   	   And on that farm he had a cow, Ee-igh, Ee-igh, Oh!
   	   Whith a moo, moo here and a moo, moo there.
   	   Here a moo, there a moo, everywhere a moo, moo.
   	   Old MacDonald had a farm, Ei-igh, Ee-igh, Oh!
   	

   (Hint: use a function with two input parameters one for the animal and the other for the related sound)


2. Write a function that takes as a parameter a list of strings and returns a list containing the first letter of each of the strings.
   That is, if the input parameter is ["Daniel","Nashyl","Orla","Simone","Zakaria"], your function should return ["D", "N", "O", "S", "Z"]. The file you submit should include a main() function that demonstrates that your function works.


3. Modify the program from Lab 7 to allow the user to enter two different mathematical functions to be graphed. Your program should then display both on in the graphics window.


4. Fill in the missing function definitions for this program:

            def main():
               welcome()              #Prints "Hello, world" to the screen 
               x,y = userInput()      #Asks user for 2 inputs and returns numbers entered
               d = calculate(x,y)     #Returns the difference of the parameters
               displayResults(x,y,d)  #Prints the two inputs, and d
    
            main()
         

   That is, write the functions welcome(), userInput(), calculate() and displayResults(). Include all functions, including the main() above in the file you submit.


5. Write a function that takes as a parameter a list of strings and returns a list containing the lengths of each of the strings. That is, if the input parameter is ["Daniel","Nashyl","Orla", "Simone","Zakaria"], your function should return [6, 6, 4, 6, 7]. The file you submit should include a main() function that demonstrates that your function works.

For more information on using Blackboard, see the first lab.

General Notes

• Two of the five submitted programs will be chosen at random for grading.
• Assignments must be submitted by midnight on the date due.
• Every program should begin with a comment that includes your name and a brief description.
• No credit will be given for a late assignment.
• Extra credit will be awarded for graded programs that are submitted early. If a graded program is submitted more than 12 hours early (before Friday noon), 1 extra credit point will be awarded. For graded programs submitted more than 24 hours early (Thursday or earlier), 2 extra credit points will be awarded.
• You MUST attach your program as a file, you may also cut and paste your program into the submission box.
• The name of the file that you submit should begin with your last name (for example: yourlastnamePS2_2.py). Your file MUST have a file type of .py
• Your program should contain a function definition for main(), and it should invoke main() at the end of the program.
• While working on this assignment you have access to help in class (if your question might be of general interest), at the Math Lab, during office hours, and using the discussion forum for this problem set on Blackboard. Please take advantage of all of these resources.