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Question 2: Simple Calculator with User Input and Operators

Objective

Write a complete Java program that demonstrates:

  • Getting user input using Scanner
  • Arithmetic operators (+, -, *, /, %)
  • Relational operators (>, <, >=, <=, ==, !=)
  • Logical operators (&&, ||, !)
  • Basic expressions and calculations

Instructions

  1. Open q2.java which contains only comments and starter guidance
  2. Write a complete Java program from scratch
  3. Follow the requirements specified below
  4. Your program should compile and run, producing the expected output format

Program Requirements

Your program should:

  1. Import the Scanner class for user input
  2. Create a class named q2
  3. Implement the main method
  4. Prompt the user to enter two numbers (can be integers or decimals)
  5. Read the input using Scanner
  6. Perform and display the following calculations:
    • Addition (num1 + num2)
    • Subtraction (num1 - num2)
    • Multiplication (num1 * num2)
    • Division (num1 / num2)
    • Modulus (num1 % num2) - only if both numbers are integers
  7. Demonstrate relational operators by comparing the two numbers
  8. Show logical operations using the comparison results

Sample Input/Output

Input:

Enter first number: 15
Enter second number: 4

Expected Output:

=== Calculator Results ===
First Number: 15.0
Second Number: 4.0

=== Arithmetic Operations ===
Addition: 15.0 + 4.0 = 19.0
Subtraction: 15.0 - 4.0 = 11.0
Multiplication: 15.0 * 4.0 = 60.0
Division: 15.0 / 4.0 = 3.75
Modulus: 15 % 4 = 3

=== Relational Operations ===
15.0 > 4.0: true
15.0 < 4.0: false
15.0 >= 4.0: true
15.0 <= 4.0: false
15.0 == 4.0: false
15.0 != 4.0: true

=== Logical Operations ===
(15.0 > 4.0) && (15.0 != 4.0): true
(15.0 < 4.0) || (15.0 == 4.0): false
!(15.0 == 4.0): true

Implementation Hints

  1. Scanner Setup:

    Scanner scanner = new Scanner(System.in);

  2. Reading Input:

    System.out.print("Enter first number: ");
double num1 = scanner.nextDouble();

  3. Modulus Operation:

    • Convert doubles to integers for modulus: (int)num1 % (int)num2

  4. Formatting Output:

    • Use System.out.println() for formatted output
    • Show operations in the format: operand1 operator operand2 = result

  5. Logical Operations:

    • Store relational results in boolean variables
    • Use these variables in logical operations

Assessment Criteria

  • Program compiles without errors
  • Correct use of Scanner for user input
  • All arithmetic operations implemented correctly
  • All relational operators demonstrated
  • Logical operators used properly
  • Output format matches the expected format
  • Proper handling of integer vs. double operations
  • Code is well-organized and readable

Compilation and Execution

# Compile
javac q2.java

# Run
java q2

Additional Challenge (Optional)

If you finish early, try adding:

  • Input validation (handle invalid input)
  • Division by zero checking
  • More complex expressions combining multiple operators