Temperature Converter

Temperature_converter.py

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+"""
+Temperature Converter
+
+Description: A simple Python program to convert temperatures between Celsius, Fahrenheit, and Kelvin.
+Includes input validation and supports bidirectional conversion between all three scales.
+
+Time Complexity: O(1) - Constant time operations
+Space Complexity: O(1) - Uses constant space
+"""
+
+def celsius_to_fahrenheit(celsius):
+    """Convert Celsius to Fahrenheit"""
+    return (celsius * 9/5) + 32
+
+def fahrenheit_to_celsius(fahrenheit):
+    """Convert Fahrenheit to Celsius"""
+    return (fahrenheit - 32) * 5/9
+
+def celsius_to_kelvin(celsius):
+    """Convert Celsius to Kelvin"""
+    return celsius + 273.15
+
+def kelvin_to_celsius(kelvin):
+    """Convert Kelvin to Celsius"""
+    return kelvin - 273.15
+
+def fahrenheit_to_kelvin(fahrenheit):
+    """Convert Fahrenheit to Kelvin"""
+    return celsius_to_kelvin(fahrenheit_to_celsius(fahrenheit))
+
+def kelvin_to_fahrenheit(kelvin):
+    """Convert Kelvin to Fahrenheit"""
+    return celsius_to_fahrenheit(kelvin_to_celsius(kelvin))
+
+def get_valid_temperature(prompt):
+    """Get a valid temperature input from user"""
+    while True:
+        try:
+            temp = float(input(prompt))
+            return temp
+        except ValueError:
+            print("Please enter a valid number!")
+
+def display_conversion_table():
+    """Display common temperature conversions for reference"""
+    print("\n" + "="*50)
+    print("COMMON TEMPERATURE CONVERSIONS")
+    print("="*50)
+    print("°C     °F     K     Description")
+    print("-"*50)
+
+    common_temps = [
+        (-40, -40, 233.15, "Extreme Cold"),
+        (0, 32, 273.15, "Freezing Point"),
+        (20, 68, 293.15, "Room Temperature"),
+        (37, 98.6, 310.15, "Human Body"),
+        (100, 212, 373.15, "Boiling Point")
+    ]
+
+    for c, f, k, desc in common_temps:
+        print(f"{c:4.1f}  {f:5.1f}  {k:6.2f}  {desc}")
+
+def main():
+    """Main function to run the temperature converter"""
+    print("="*50)
+    print("        TEMPERATURE CONVERTER")
+    print("="*50)
+
+    while True:
+        print("\nConversion Options:")
+        print("1. Celsius to Fahrenheit")
+        print("2. Fahrenheit to Celsius")
+        print("3. Celsius to Kelvin")
+        print("4. Kelvin to Celsius")
+        print("5. Fahrenheit to Kelvin")
+        print("6. Kelvin to Fahrenheit")
+        print("7. Display Conversion Table")
+        print("8. Exit")
+
+        choice = input("\nEnter your choice (1-8): ").strip()
+
+        if choice == '1':
+            celsius = get_valid_temperature("Enter temperature in Celsius: ")
+            fahrenheit = celsius_to_fahrenheit(celsius)
+            print(f"{celsius:.2f}°C = {fahrenheit:.2f}°F")
+
+        elif choice == '2':
+            fahrenheit = get_valid_temperature("Enter temperature in Fahrenheit: ")
+            celsius = fahrenheit_to_celsius(fahrenheit)
+            print(f"{fahrenheit:.2f}°F = {celsius:.2f}°C")
+
+        elif choice == '3':
+            celsius = get_valid_temperature("Enter temperature in Celsius: ")
+            kelvin = celsius_to_kelvin(celsius)
+            print(f"{celsius:.2f}°C = {kelvin:.2f}K")
+
+        elif choice == '4':
+            kelvin = get_valid_temperature("Enter temperature in Kelvin: ")
+            celsius = kelvin_to_celsius(kelvin)
+            print(f"{kelvin:.2f}K = {celsius:.2f}°C")
+
+        elif choice == '5':
+            fahrenheit = get_valid_temperature("Enter temperature in Fahrenheit: ")
+            kelvin = fahrenheit_to_kelvin(fahrenheit)
+            print(f"{fahrenheit:.2f}°F = {kelvin:.2f}K")
+
+        elif choice == '6':
+            kelvin = get_valid_temperature("Enter temperature in Kelvin: ")
+            fahrenheit = kelvin_to_fahrenheit(kelvin)
+            print(f"{kelvin:.2f}K = {fahrenheit:.2f}°F")
+
+        elif choice == '7':
+            display_conversion_table()
+
+        elif choice == '8':
+            print("Goodbye!")
+            break
+
+        else:
+            print("Invalid choice! Please enter 1-8.")
+
+# Test functions
+def run_tests():
+    """Run tests to verify conversion accuracy"""
+    print("Running tests...")
+
+    test_cases = [
+        (0, 32, 273.15),      # Freezing point
+        (100, 212, 373.15),   # Boiling point
+        (-40, -40, 233.15),   # Equal point
+        (37, 98.6, 310.15),   # Body temperature
+    ]
+
+    passed = 0
+    for celsius, fahrenheit, kelvin in test_cases:
+        # Test Celsius to Fahrenheit
+        calc_f = celsius_to_fahrenheit(celsius)
+        f_match = abs(calc_f - fahrenheit) < 0.1
+
+        # Test Celsius to Kelvin
+        calc_k = celsius_to_kelvin(celsius)
+        k_match = abs(calc_k - kelvin) < 0.1
+
+        # Test Fahrenheit to Celsius
+        calc_c = fahrenheit_to_celsius(fahrenheit)
+        c_match = abs(calc_c - celsius) < 0.1
+
+        if f_match and k_match and c_match:
+            print(f"✓ PASS: {celsius}°C = {fahrenheit}°F = {kelvin}K")
+            passed += 1
+        else:
+            print(f"✗ FAIL: {celsius}°C")
+            print(f"  Expected: {fahrenheit}°F, {kelvin}K")
+            print(f"  Got: {calc_f:.2f}°F, {calc_k:.2f}K")
+
+    print(f"\nTest Results: {passed}/{len(test_cases)} passed")
+    return passed == len(test_cases)
+
+if __name__ == "__main__":
+    # Run tests first
+    if run_tests():
+        print("\nAll tests passed! Starting interactive mode...\n")
+        main()
+    else:
+        print("\nSome tests failed! Please check the implementation.")