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Use case based programming exercises

đź“ť Use‑Case based exercises for programmers

1. Café Billing System

  • Scenario: A cafĂ© sells coffee at ₹120 per cup and tea at ₹80 per cup.
  • Task: Write a program that asks the customer how many coffees and teas they ordered, then prints the total bill.
  • Hint: Identify variables for quantities, unit prices, and total amount. Use arithmetic operators.

2. Student Result Checker

  • Scenario: A student’s exam score is entered.
  • Task: Print “Pass” if marks ≥ 50, otherwise “Fail”.
  • Hint: Use relational operators and an if-else statement.

3. Traffic Signal Decision

  • Scenario: A traffic light shows either Red, Yellow, or Green.
  • Task: Based on the input, print “Stop”, “Get Ready”, or “Go”.
  • Hint: Use conditional statements (if-else or switch).

4. Discount Eligibility

  • Scenario: A shop gives a 10% discount if the purchase amount is more than ₹1000.
  • Task: Ask the user for purchase amount and print final price after discount if eligible.
  • Hint: Use relational operators and arithmetic.

5. Even Numbers Printer

  • Scenario: A teacher wants to display all even numbers between 1 and 20.
  • Task: Write a program using a loop to print them.
  • Hint: Use for loop and modulus operator %.

6. Multiplication Table Generator

  • Scenario: A student wants to learn multiplication tables.
  • Task: Ask for a number and print its table up to 10.
  • Hint: Use for loop and multiplication.

7. Voting Eligibility

  • Scenario: Government portal checks if a person can vote.
  • Task: Input age, print “Eligible” if age ≥ 18, else “Not Eligible”.
  • Hint: Use conditional statements.

8. Largest of Three Numbers

  • Scenario: A math quiz asks the student to find the largest of three given numbers.
  • Task: Write a program to print the largest number.
  • Hint: Use nested if-else.

9. Simple Login System

  • Scenario: A system checks username and password.
  • Task: If both match predefined values, print “Login Successful”, else “Access Denied”.
  • Hint: Use logical operators (&&) and conditional statements.

10. Sum of First N Natural Numbers

  • Scenario: A student wants to calculate the sum of first N numbers.
  • Task: Input N and print the sum.
  • Hint: Use a loop and accumulator variable.

11. Library Fine Calculator

  • Scenario: A library charges ₹2 per day for late returns.
  • Task: Input the number of days late and calculate the fine. If fine > ₹50, print “Membership Suspended”.
  • Hint: Variables → daysLate, fine. Use arithmetic + conditional.

12. Temperature Converter

  • Scenario: A weather app needs to convert Celsius to Fahrenheit.
  • Task: Input temperature in Celsius and print Fahrenheit. Formula: F = (C * 9/5) + 32.
  • Hint: Variables → celsius, fahrenheit. Use arithmetic.

13. Bus Ticket Booking

  • Scenario: A bus ticket costs ₹500. If passenger age < 12, they get 50% discount.
  • Task: Input age and print ticket price.
  • Hint: Variables → age, price. Use conditional.

14. Bank Interest Calculator

  • Scenario: A bank gives 5% annual interest.
  • Task: Input principal and years, calculate final amount. Formula: Amount = Principal + (Principal * Rate * Years) / 100.
  • Hint: Variables → principal, years, amount. Use arithmetic.

15. Odd Number Printer

  • Scenario: A math teacher wants all odd numbers between 1 and 30.
  • Task: Write a program using a loop to print them.
  • Hint: Use for loop and % operator.

16. Grade Point Average (GPA) Calculator

  • Scenario: A student has marks in 5 subjects.
  • Task: Input marks, calculate average, and print grade (A/B/C/F).
  • Hint: Variables → marks[], average. Use loop + conditional.

17. Simple ATM Withdrawal

  • Scenario: ATM allows withdrawal only if balance ≥ amount.
  • Task: Input balance and withdrawal amount. Print “Transaction Successful” or “Insufficient Balance”.
  • Hint: Variables → balance, withdrawAmount. Use conditional.

18. Electricity Bill Calculator

  • Scenario: Electricity board charges ₹5 per unit. If units > 100, extra surcharge of ₹200.
  • Task: Input units consumed and print bill.
  • Hint: Variables → units, bill. Use arithmetic + conditional.

19. Palindrome Checker

  • Scenario: A word is palindrome if it reads same forward and backward.
  • Task: Input a string and check if it’s palindrome.
  • Hint: Variables → word, reversedWord. Use loop/string methods + conditional.

20. Simple Quiz Game

  • Scenario: A quiz asks 3 questions. Each correct answer gives 10 points.
  • Task: Input answers, calculate score, and print result.
  • Hint: Variables → score, answer. Use conditional + loop.

21. Cinema Ticket Counter

  • Scenario: A cinema charges ₹250 per ticket. If more than 5 tickets are booked, give 20% discount.
  • Task: Input number of tickets and print total cost.

22. Water Bill Calculator

  • Scenario: Water board charges ₹10 per unit. If usage > 500 units, add ₹1000 surcharge.
  • Task: Input units and print bill.

23. BMI Calculator

  • Scenario: Health app calculates BMI = weight / (height * height).
  • Task: Input weight (kg) and height (m), print BMI and category (Underweight/Normal/Overweight).

24. Taxi Fare Estimator

  • Scenario: Taxi charges ₹50 base fare + ₹20 per km.
  • Task: Input distance and print fare.

25. Leap Year Checker

  • Scenario: Calendar app checks if a year is leap year.
  • Task: Input year, print “Leap Year” or “Not Leap Year”.

26. Simple Calculator

  • Scenario: User enters two numbers and an operator (+, -, *, /).
  • Task: Perform operation and print result.

27. Hotel Room Booking

  • Scenario: Hotel charges ₹2000 per night. If stay ≥ 7 nights, give 1 night free.
  • Task: Input nights and print total cost.

28. Speed Limit Checker

  • Scenario: Road speed limit is 60 km/h.
  • Task: Input speed, print “Over Speeding” if > 60, else “Safe Driving”.

29. Currency Converter

  • Scenario: Convert USD to INR (1 USD = ₹83).
  • Task: Input USD amount and print INR.

30. Parking Lot Fee

  • Scenario: Parking charges ₹30 per hour. If parked > 5 hours, flat ₹200.
  • Task: Input hours and print fee.

31. Factorial Calculator

  • Scenario: Math app calculates factorial of a number.
  • Task: Input N and print factorial using loop.

32. Prime Number Checker

  • Scenario: Teacher wants to check if a number is prime.
  • Task: Input number, print “Prime” or “Not Prime”.

33. Shopping Cart Total

  • Scenario: A cart has 3 items with given prices.
  • Task: Input quantities, calculate total bill.

34. Attendance Percentage

  • Scenario: College requires 75% attendance.
  • Task: Input total classes and attended classes, print percentage and eligibility.

35. Simple Interest Calculator

  • Scenario: Formula: SI = (P * R * T) / 100.
  • Task: Input principal, rate, time, print interest.

36. Reverse Number

  • Scenario: A puzzle asks to reverse digits of a number.
  • Task: Input number, print reversed number.

37. Armstrong Number Checker

  • Scenario: A number is Armstrong if sum of cubes of digits = number.
  • Task: Input number, check Armstrong.

38. Grade Distribution

  • Scenario: School wants to classify marks: ≥90 A, ≥75 B, ≥50 C, else F.
  • Task: Input marks and print grade.

39. Restaurant Bill Splitter

  • Scenario: Friends share bill equally.
  • Task: Input total bill and number of friends, print share per person.

40. Fibonacci Series Generator

  • Scenario: Math app prints first N Fibonacci numbers.
  • Task: Input N and print series.

41. Online Shopping Cart with Discount Codes

  • Scenario: An e‑commerce site allows customers to add 5 items to their cart. If the total exceeds ₹5000, apply a 15% discount. If a promo code "SAVE100" is entered, subtract ₹100 additionally.
  • Task: Input prices of 5 items and optional promo code, then print final bill.
  • Concepts: Arrays, loops, conditionals, string comparison.

42. Student Marks Analyzer

  • Scenario: A class has 10 students. Each student’s marks are entered. The program should calculate:
    • Highest marks
    • Lowest marks
    • Average marks
  • Task: Input marks into an array and print results.
  • Concepts: Arrays, loops, min/max logic, arithmetic.

43. Bank Transaction System

  • Scenario: A bank account starts with ₹10,000. User can perform multiple transactions (deposit or withdraw). If withdrawal > balance, print “Insufficient Funds”. After all transactions, print final balance.
  • Task: Input number of transactions, then process each one.
  • Concepts: Loops, conditionals, running totals.

44. Word Frequency Counter

  • Scenario: A text analyzer counts how many times each word appears in a sentence.
  • Task: Input a sentence, split into words, and print frequency of each word.
  • Concepts: Strings, arrays, loops, conditionals.

45. Simple Library Management

  • Scenario: A library has 5 books stored in an array. User can:
    • Search for a book by title
    • Borrow a book (mark as unavailable)
    • Return a book (mark as available)
  • Task: Implement menu‑driven program for these actions.
  • Concepts: Arrays, strings, loops, conditionals, menu system.

46. Salary Slip Generator

  • Scenario: A company pays a basic salary. If HRA = 20% of basic and DA = 10% of basic, calculate gross salary. If gross > ₹50,000, deduct 10% tax.
  • Task: Input basic salary, calculate gross and net salary.
  • Concepts: Arithmetic, conditionals, multiple variables.

47. Number Guessing Game

  • Scenario: System has a secret number (say 25). User keeps guessing until correct. Print “Too High” or “Too Low” until match.
  • Task: Implement guessing loop until correct number is entered.
  • Concepts: Loops, conditionals, user input validation.

48. Simple Banking PIN Check

  • Scenario: ATM allows 3 attempts to enter correct PIN. If correct, print “Access Granted”, else “Card Blocked”.
  • Task: Input PIN attempts, check validity.
  • Concepts: Loops, conditionals, counters.

49. Restaurant Order System

  • Scenario: A restaurant menu has 3 items:
    • 1 → Pizza ₹300
    • 2 → Burger ₹150
    • 3 → Juice ₹80
  • Task: User selects item number and quantity, program prints bill.
  • Concepts: Switch case, arithmetic, conditionals.

50. Loan Eligibility Checker

  • Scenario: Bank checks loan eligibility:
    • Age ≥ 21
    • Salary ≥ ₹25,000
    • No existing loan (boolean flag)
  • Task: Input age, salary, loan status. Print “Eligible” or “Not Eligible”.
  • Concepts: Relational + logical operators, conditionals.


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