Add three Java mini-projects: calculator, inventory manager, and student grader

[Copilot]

Implements three standalone Java applications demonstrating core programming concepts: arithmetic operations with error handling, collection-based data management, and statistical computation with formatting.

Projects

SimpleCalculator (127 lines)

• Binary arithmetic operations (+, -, *, /) via switch statement
• Division-by-zero and invalid operator validation

SimpleInventoryManager (242 lines)

• ArrayList-backed CRUD operations for inventory items
• Menu-driven interface with negative value validation

BasicStdtGrdr (210 lines)

• Five-score average calculation and letter grade assignment (A-F)
• Formatted tabular output with class statistics
• Score range validation (0-100)

Example Usage

// SimpleCalculator
Enter first number: 10
Enter operator (+, -, *, /): /
Enter second number: 0
Error: Division by zero is not allowed!

// SimpleInventoryManager (menu option 1)
Enter item name: Laptop
Enter item price: $-999.99
Error: Price cannot be negative!

// BasicStdtGrdr
Enter 5 test scores:
Score 1: 95
Score 2: 105
Error: Score must be between 0 and 100! Please re-enter data for this student.

Each project includes compilation/execution instructions in dedicated README files.

Original prompt

Create structure for three Java mini-projects (70+ lines each):

1. SimpleCalculator: CMD calculator (2 nums, 1 op). Must use a switch. Error check for division by zero and invalid operators.
2. SimpleInventoryManager: Menu-driven inventory using a Java Collection. Core functions: Add, View, Update Stock, Remove items.
3. BasicStdtGrdr: Input names/ five scores. Calculates average and assigns letter grade (A-F). Outputs formatted results table

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