Unit 2 tasks

These challenges use ideas from Unit 1 (types, variables, operators) and Unit 2 (conditionals, while / for, break, and random). Try each task on your own first, then peek at the linked solution if you are stuck.

Lessons: 1.1 Types · 1.2 Variables · 1.3 Operators · 2.1 Conditionals · 2.2 Loops

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Tutorials: Tutorial 2.1 · Tutorial 2.2

Warm-up - one choice or short loops

Task 1: Running total at the bake sale - Add sale amounts until the cashier enters 0; print the total takings.
Task 2: Highest temperature this week - Read five daily high temperatures; print the largest.
Task 3: Staff room keypad - Keep asking for a password until the user enters python123.
Task 4: Counting even raffle tickets - Count how many even ticket numbers were entered; stop when the user enters -1.
Task 5: Zoo ticket price - One visitor’s age → print child, adult, or senior price using if / elif / else.
Task 6: Report card letter - Turn one percentage mark into a letter grade (A–F) with elif ladder.
Task 7: Freezing day on the farm - Read one Celsius temperature; say if water would freeze outside.
Task 8: Odd or even order total - One integer: say if it is odd or even (useful for splitting orders).
Task 9: Bus departure countdown - Print a countdown from N down to 1 using a for loop.
Task 10: Sticker sheet total - Sum the integers 1 + 2 + … + N for a user-chosen N using a loop.

Loops with decisions - money, games, and data

Task 11: Strawberry stand checkout - Until the customer pays enough: show change or exact payment; use 1 decimal for change.
Task 12: Valid marks only - Average exam marks between 50 and 100; stop at -5; ignore invalid marks.
Task 13: Waiting for a lucky 7 - Random 1–10 until 7; print each roll and count attempts.
Task 14: Coin race to ten - Flip until heads or tails reaches 10; print winner and total flips.
Task 15: Higher–lower guessing game - Classic 1–100 secret number until correct (like the Unit 2 project).
Task 16: ATM PIN (three tries) - Lock out after three wrong PIN attempts; success prints welcome message.
Task 17: Five-question mental maths quiz - Ask five addition questions; score how many were correct.
Task 18: Charity jar total - Add donations until user enters 0; print total raised.
Task 19: Shop times table poster - Print the multiplication table for one integer from 1×N to 12×N.
Task 20: Factorial orderings - Compute N! for a small positive N using a loop (no math.factorial).
Task 21: Weekly step average - Seven inputs; print average daily steps (integer division OK or float).
Task 22: Savings goal - Each week add savings until balance reaches or passes a goal amount.
Task 23: Strong enough Wi‑Fi password - Reject passwords shorter than 8 characters until a valid one is entered.
Task 24: Guess with seven tries - Number 1–50; player has at most 7 guesses; win or lose message.
Task 25: Rock, paper, scissors - first to three - Best-of-style loop until one player reaches 3 wins (user vs computer).

Applied scenarios - shops, travel, and patterns

Task 26: BMI and health band - Compute BMI from height (m) and weight (kg); print category; re-prompt if inputs invalid.
Task 27: US road trip temperatures - Convert seven Celsius forecasts to Fahrenheit each day.
Task 28: Stock on the shelf - Start with stock count; subtract each sale until stock hits 0 or user quits.
Task 29: Bus passenger count - Track riders: positive = board, negative = leave; stop at sentinel; never below 0.
Task 30: FizzBuzz inventory labels - Print 1..N replacing multiples of 3 and 5 with words (classic FizzBuzz).
Task 31: Is this number prime? - Test one integer ≥ 2: print prime or not using a trial division loop.
Task 32: Collatz hailstone length - Start from n: if even n//2 else 3n+1; count steps until you reach 1.
Task 33: Dice doubles at the café - Roll two dice until they match; count how many rolls.
Task 34: Simple pay-down balance - Subtract fixed payment each month until balance ≤ 0; print month count.
Task 35: Coffee stamp card - 10 stamps earn a free drink; simulate until two free rewards are earned.
Task 36: Elevator floor hops - Start at floor 1; repeatedly go to requested floor until user enters 0.
Task 37: Guess the product - Secret A and B 1–10; user guesses product until correct.
Task 38: Live class average - After each valid mark (0–100), print running average; -1 to stop.
Task 39: Café lunch order - Simple menu: loop choose 1–3 or 0 to pay; accumulate bill.
Task 40: Fibonacci rabbit pairs (small n) - Print first n Fibonacci numbers (1, 1, 2, 3, 5, …) with a loop.

Stretch - nested loops, math, and trickier control flow

Task 41: Greatest common divisor - Euclid’s algorithm with a while loop for two positive integers.
Task 42: Powers by repeated multiplication - Compute base^exponent with repeated multiplication (exponent ≥ 0); do not use ** or pow.
Task 43: Count digits in a sale ID - Positive integer: how many digits (repeated // 10).
Task 44: Reverse digits of a sale code - Build reversed integer with % 10 and // 10 in a loop.
Task 45: Sum of squares pyramid - Compute 1² + 2² + … + n² for user n.
Task 46: Guess my number with play again - Wrap the guessing game: after win, ask y/n to play again (outer while).
Task 47: Battery drain simulation - Start 100%; subtract random drain until ≤ 0; count hours.
Task 48: Star triangle banner - Print a triangle of * with n rows (row i has i stars).
Task 49: Full multiplication square - Double loop: for rows 1–12 and cols 1–12 print row×col in a grid (tab-separated OK).
Task 50: Delivery van route checker - Sum package weights until over capacity or user ends; report status.

Solutions are on separate pages: e.g. Task 1 solution.