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17. BMI Calculator Beginner Projects

Input: Allow the user to enter their weight (in kilograms or pounds) and height (in meters or feet/inches).
BMI Calculation Logic: Implement the Body Mass Index (BMI) formula:
- BMI = weight (kg) / [height (m)]²
- If the weight is provided in pounds and height in feet/inches, add appropriate conversion formulas.
Output: Display the calculated BMI to the user and indicate the BMI category (underweight, normal weight, overweight, obese).

User Input:
- Ask the user to input their weight (specify the unit as kilograms or pounds).
- Ask the user to input their height (specify the unit as meters or feet/inches).
BMI Calculation:
- If the inputs are in pounds/feet, convert them to kilograms and meters using appropriate conversion factors.
- Apply the BMI formula to calculate the user’s BMI.
Display Result:
- Show the user their BMI along with a corresponding category:
  - Underweight (BMI < 18.5)
  - Normal weight (BMI 18.5 - 24.9)
  - Overweight (BMI 25 - 29.9)
  - Obese (BMI ≥ 30)

Input Validation:
- Ensure the user enters valid numeric values for both weight and height.
- Check for any negative or zero values (which are invalid for weight and height).
Feedback:
- Provide clear messages if the user enters invalid data (e.g., non-numeric input, unrealistic values).

Unit Choice:
- Allow the user to select whether they want to use metric (kg, meters) or imperial (pounds, feet/inches) units.
Multiple Calculations:
- Give the user the option to calculate BMI multiple times without exiting the program.
Health Tips:
- Based on the BMI category, provide basic health advice or links to resources.

This project will give you practice with: