# Basic Calculator

A simple Python command-line calculator that performs addition, subtraction, multiplication, and division based on user input.

## How to Use

1. **Open Terminal**  
   Open your terminal in the folder containing `cal.py`.

2. **Run the Program**  
   Run the following command:
   ```
   python cal.py
   ```

3. **Follow Prompts**  
   - Enter the first number when prompted.
   - Enter the second number.
   - Enter the operation (`+`, `-`, `*`, or `/`).

4. **View Result**  
   The program will display the result of the calculation.

## Example

```
Enter the first number: 10
Enter the second number: 5
Enter an operation (+, -, *, /): +
10.0 + 5.0 = 15.0
```

## Error Handling

- If you enter a non-numeric value, you'll see:  
  `Invalid input. Please enter numeric values.`
- If you try to divide by zero, you'll see:  
  `Error: Division by zero is not allowed.`
- If you enter an invalid operation, you'll see:  
  `Invalid operation. Please use +, -, *, or /.`

---
Simple and easy to use!