• 4-1: Boolean Expressions
• 4-2: Number Guessing Game
• 4-3: Is a year a leap year?
• 4-4: Improving the Guessing Game
• 4-5: Zeller's Algorithm
• 4-6: Global Classics Cinema
• 4-7: Grade Calculator
• 4-8: Adventure Tour Selector
• 4-9: Room Reservation System
• 4-10: Stopwatch