Temperature Converter¶

In this exercise, you'll build a temperature conversion program using functions.

Part 1: Basic Converter Functions¶

Write these three functions:

def celsius_to_fahrenheit(c):
    # Convert Celsius to Fahrenheit
    # Formula: (C × 9/5) + 32
    # Return the result

def fahrenheit_to_celsius(f):
    # Convert Fahrenheit to Celsius  
    # Formula: (F - 32) × 5/9
    # Return the result

def celsius_to_kelvin(c):
    # Convert Celsius to Kelvin
    # Formula: C + 273.15
    # Return the result

Test your functions:

print(celsius_to_fahrenheit(0))    # Should print 32.0
print(fahrenheit_to_celsius(32))   # Should print 0.0
print(celsius_to_kelvin(0))        # Should print 273.15

Part 2: Write a `fahrenheit_to_kelvin`¶

For this part, I'd like you to write a fahrenheit_to_kelvin function. HOWEVER, you should not do any math in this function. Write this function only using the functions you have already defined.

def fahrenheit_to_kelvin(f):
    # Convert Fahrenheit to Celsius  
    # Don't do math here, use the other functions
    # Return the result

print(fahrenheit_to_kelvin(32)) # Should print 273.15

Part 3: Input Validation Function¶

Write a function that gets a valid temperature from the user:

def get_temperature():
    # Ask user for a temperature
    # Make sure you convert the input to a float
    # A valid temperature must be:
    # - Greater than 0 Kelvin (theoretical limit)
    # - Less 1127 Celsius (tempurature of a volcano)
    # Keep asking (in a loop) until it's a valid number
    # Return the temperature as a float

Write a function that shows a menu and gets the user's choice:

def get_menu_choice():
    # Display menu:
    # 1. Celsius to Fahrenheit
    # 2. Fahrenheit to Celsius  
    # 3. Celsius to Kelvin
    # 4. Quit
    # Get user's choice and return it as a string

Part 5: Put It All Together¶

Write a main function that uses all your other functions:

def main():
    # Show welcome message
    # Loop until user chooses to quit:
    #   - Get menu choice
    #   - If quit, break
    #   - Get temperature from user
    #   - Call appropriate conversion function
    #   - Display the result
    # Show goodbye message

# Run the program
main()

Sample Output¶

Welcome to Temperature Converter!

1. Celsius to Fahrenheit
2. Fahrenheit to Celsius
3. Celsius to Kelvin
4. Quit
Choose (1-4): 1

Enter temperature: 100
100.0 C = 212.0 F

1. Celsius to Fahrenheit
2. Fahrenheit to Celsius
3. Celsius to Kelvin
4. Quit
Choose (1-4): 4

Goodbye!

Bonus Challenges¶

Add a function is_water_boiling(temp, unit) that returns True if the temperature would boil water (100°C, 212°F, or 373.15K)
Add a function describe_weather(temp_celsius) that returns a string describing the weather:
- Below 0: "Freezing!"
- 0-10: "Cold"
- 11-20: "Cool"
- 21-30: "Warm"
- Above 30: "Hot!"
Let the user enter the input unit ("C", "F", or "K"), the amount, and then the output unit as three separate inputs.