Computer Science 15-112, Spring 2012
Class Notes:  Writing Functions Practice (Problem-Solving)

1. eggCartons
2. militaryTimeToStandardTime

Writing Functions Practice (Problem-Solving)

1. eggCartons
   
   # eggCartons
   # Write a program that reads in a non-negative number of eggs,
   # and prints the number of egg cartons required to hold that many eggs
   # (given that each egg carton holds one dozen eggs, and you cannot buy
   # fractional egg cartons).  Be sure your program works for multiples of 12,
   # including 0.
   
   def eggCartons(eggs):
       # You write this!
      
   def testEggCartons():
       print "Testing eggCartons()...",
       assert(eggCartons(0) == 0)
       assert(eggCartons(1) == 1)
       assert(eggCartons(12) == 1)
       assert(eggCartons(13) == 2)
       assert(eggCartons(24) == 2)
       assert(eggCartons(25) == 3)
       print "Passed all tests!"
   
   def runEggCartons():
       eggs = int(raw_input("Enter number of eggs:"))
       cartons = eggCartons(eggs)
       print eggs, "eggs require", cartons, "egg cartons"
      
   testEggCartons() # run the robotic test function
   runEggCartons()  # let the user use the function
   
   Sample Solution:
   
   # Sample Solution is in white text (select to view)
   ##########################################
   def eggCartons(eggs):
       return (eggs + 11) / 12
   ##########################################
   
   
   
2. militaryTimeToStandardTime
   
   # militaryTimeToStandardTime
   # Write a program that reads in an integer between 0 and 23,
   # representing the hour in military time, and prints the same
   # hour in standard time.  For example, 17 is 5 o'clock.
   
   def militaryTimeToStandardTime(militaryTime):
       # You write this!
   
   def testMilitaryTimeToStandardTime():
       print "Testing militaryTimeToStandardTime()...",
       assert(militaryTimeToStandardTime(0) == 12)
       assert(militaryTimeToStandardTime(1) == 1)
       assert(militaryTimeToStandardTime(11) == 11)
       assert(militaryTimeToStandardTime(12) == 12)
       assert(militaryTimeToStandardTime(13) == 1)
       assert(militaryTimeToStandardTime(23) == 11)
       print "Passed all tests!"
   
   def runMilitaryTimeToStandardTime():
       militaryTime = int(raw_input("Enter the military time (0-23):"))
       standardTime = militaryTimeToStandardTime(militaryTime)
       print "Military time:", militaryTime
       print "Standard time:", standardTime
     
   testMilitaryTimeToStandardTime() # run the robotic test function
   runMilitaryTimeToStandardTime()  # let the user use the function
   
   Sample Solution:
   
   # Sample Solution is in white text (select to view)
   ##########################################
   def militaryTimeToStandardTime(militaryTime):
       return 1 + (militaryTime-1) % 12
   ##########################################
   
   

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