A Second Algorithm

• Let's work on the second example problem
• Remember we need to:
  • Read and understand the problem.
    • Note ambiguities/inconsistencies/problems
  • Provide a high level summary.
  • Note input/output
  • Develop a method
    • Note potential test cases while doing this
  • Write an algorithm
  • Test the algorithm.
• Any questions?
  • How should we input the type of day? as a word, normal, busy, holiday.
• A high level summary:

  •  Given the number of ice cream cones we expect to sell and 
          the type of day, compute the number of gallons of ice cream needed 
          if one gallon of ice cream will make 24 cones.

• Input/output
  • Input: number of cones and type of day
  • Output: gallons of ice cream
• Examples:

  • 20 cones on a normal day
         base gallons needed = roundup (20/24)   1
         multiplier = 1 (normal day)
         gallons = 1 * 1 = 1
        
    25 cones on a normal day
         base gallons needed = roundup (25/24)   2
         multiplier = 1 (normal day)
         gallons = 2 * 1 = 2
    
    259 cones on a normal day
         base gallons needed = roundup (259/24)   11
         multiplier = 1 (normal day)
         gallons = 11 * 1 = 11
    
    259 cones on a busy day
         base gallons needed = roundup (259/24)   11
         multiplier = 2 (busy day)
         gallons = 11 * 2 = 22 
    
    259 cones on a holiday day
         base gallons needed = roundup (259/24)   11
         multiplier = 4 (holiday day)
         gallons = 11 * 4 = 44 
            

• Algorithm

  • ask the user for the number of cones
    ask the user for type of day (normal, busy, holiday)
    
    baseGallons = roundup(cones/CONES_PER_GALLON)
    
    if typeOfDay == normal
       multiplier = 1
    else if typeOfday == busy
       multiplier = 2
    else 
       multiplier = 4
    
    gallons = baseGallons * multiplier
    
    print the number of gallons needed.
          

• If you would like a java solution is here