🧮 Rust CLI Calculator

A blazing-fast, type-safe command-line calculator with CGPA support, random number generation, and formatted output. Built with Rust’s safety guarantees.

Features (incluing expected)

• ➕ Basic Math: +, -, *, /, %
• 🎓 CGPA Calculator: Compute semester GPA/CGPA
• 🎲 Random Numbers: Generate within a range
• ✨ Pretty Output: Colorized results (via std::fmt)
• 📊 Calculation History: Last 5 operations saved

**Output:**
```text
┌──────────────┬────────┐
│ Course       │ Grade  │
├──────────────┼────────┤
│ 3 credits    │ A      │
│ 4 credits    │ B      │
│ 2 credits    │ D      │
└──────────────┴────────┘
CGPA: 3.54/4.0

🎲 Random Numbers

calc random --min 10 --max 50  # Random integer between 10-50

🏗️ Code Structure

src/
├── cgpa.rs            # CGPA logic (grade mapping, weighted average)
├── operation.rs       # Root arithmetic operations
├── shunting_yard.rs   # Implementation of shunting yard algorithm. Prioritizing PEMDAS
├── shunting_yard/     # Directory for shunting yard operationn
│   └── operation.rs   # Subroot arithmetic operations used in Shunting yard
└── main.rs            # CLI interface

🤝 Contributing

To add features (e.g., SGPA support):

1. Implement logic in cgpa.rs
2. Add tests:

   #[test]
   fn test_cgpa_calculation() {
       assert_eq!(calculate_cgpa(&[3, 4], &["A", "B+"]), 3.45);
   }

3. Submit a PR!

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