# 26. Unit Converter

def length_conversion(value, from_unit, to_unit):

# Base unit: Meter

conversions = {

'meters': 1,

'feet': 3.28084,

'inches': 39.3701,

'kilometers': 0.001,

'miles': 0.000621371

}

if from_unit not in conversions or to_unit not in conversions:

return None

# Convert from input unit to meters

meters = value / conversions[from_unit]

# Convert from meters to target unit

result = meters * conversions[to_unit]

return result

def weight_conversion(value, from_unit, to_unit):

# Base unit: Kilogram

conversions = {

'kilograms': 1,

'pounds': 2.20462,

'ounces': 35.274,

'grams': 1000

}

if from_unit not in conversions or to_unit not in conversions:

return None

# Convert from input unit to kilograms

kilograms = value / conversions[from_unit]

# Convert from kilograms to target unit

result = kilograms * conversions[to_unit]

return result

def main():

print("=== Unit Converter ===")

print("1. Length (meters, feet, inches, kilometers, miles)")

print("2. Weight (kilograms, pounds, ounces, grams)")

choice = input("Select a conversion category (1-2): ")

if choice == '1':

value = float(input("Enter Value: "))

from_unit = input("Convert from unit: ").lower()

to_unit = input("Convert to unit: ").lower()

result = length_conversion(value, from_unit, to_unit)

if result is not None:

print(f"{value} {from_unit} is equal to {result:.2f} {to_unit}.")

else:

print("Invalid units.")

elif choice == '2':

value = float(input("Enter Value: "))

from_unit = input("Convert from unit: ").lower()

to_unit = input("Convert to unit: ").lower()

result = weight_conversion(value, from_unit, to_unit)

if result is not None:

print(f"{value} {from_unit} is equal to {result:.2f} {to_unit}.")

else:

print("Invalid units.")

else:

print("Invalid category.")

if __name__ == "__main__":

main()