Class 19 – Wednesday February 27
Decisions made easy
I am positive — My favorite color is hue — Easy decision
Look both ways
- Some problem solving requires the ability to react — depending upon the circumstances different conditions need actions to be performed. Python provides the
ifstatement for decision making.
- The
ifstatement uses logical test expressions to determine which action to perform.
- There are variants of the
ifstatement to make decisions based on one, two, or several possibilities.
Riddle me this — what classrooms are viable for scheduling CS 1112
- The School of Engineering and Applied Science (SEAS) has four-tiered classrooms: MEC 205, Olsson Hall 120, Rice 130, and Thornton E316. All four rooms provide WIFI access. Only MEC 205, Olsson Hall 120, and Rice 130 support classroom sizes greater than 100. MEC 205 and Olsson 120 do not provide student power ports.
- The registrar has rules about scheduling 75-minute classes. They can meet anytime on Tuesdays or Thursdays. On Mondays, Wednesdays, or Fridays they cannot be scheduled before 2:00 PM.
- Surveys indicate that on average, students preferred classes whose starting times do not occur before 10:00 AM or after 2:00 PM.
- Tiered seating allows for a better eye contact between an instructor and other members of the class. Better eye contact encourages student engagement.
- Jim Cohoon has several general teaching preferences.
- Maximize student access to his courses.
- Class sessions be 75-minutes.
- 1xxx and 2xxx level courses meet three times a week.
- 3xxx and 4xxx courses meet twice a week.
- Classrooms should provide student access to WIFI and to power ports.
- Maximize student engagement.
Problems
Program acid_test.py
- Determine whether its input pH level is acidic; i.e., less than 7.0
Three sample runs
Enter pH level: 6.5true
Enter pH level: 7.0false
Enter pH level: 7.5false
Program what_color_will_my_chrysanthemums_be.py
- Determine chrysanthemum color given an input soil pH level, where acidic soil produces pink chrysanthemums and non-acidic soil produces blue chrysanthemums.
Three sample runs
Enter soil pH level: 6.5pink
Enter soil pH level: 7blue
Enter soil pH level: 7.5blue
Program daisy_daisy.py
- Report message based on indicated day of week. The message should be
weekend dayfor Sunday and for Saturday, the message should be'start of school week'for Monday, the message should be'end of school week'for Friday, and'school day', otherwise.
Seven sample runs
Enter day of week: Sundayweekend day
Enter day of week: mondaystart of school week
Enter day of week: TUESDAYschool day
Enter day of week: Wednesdayschool day
Enter day of week: Thursdayschool day
Enter day of week: Fridayend of school week
Enter day of week: Saturdayweekend day
Program robotomy.py
- Determine what happens when a robot comes knocking on a door.
- If the door is locked, the robot should be instructed to turn around.
- If the door is instead unlocked, the robot should be instructed to open the door and enter the room. Before entering, the robot should determine whether the light is off. If it is off, the robot should be instructed to first turn on the light.
- Observation there is one procedure to perform if the door is locked, another to perform if it is unlocked. The procedure to perform if the door is unlocked, requires analysis whether the light is on.
Three sample runs
Door (locked / unlocked): locked
Turn around
Door (locked / unlocked): Unlocked
Open the door
Light (on / off): on
Enter the room
Door (locked / unlocked): unlocked
Open the door
Light (on / off): Off
Turn on the light
Enter the room
Epistle
To do list
- Really examine the above and the artifacts
