Roman numerals Python Converter
Instructions
Python challenge to create a Roman numerals converter. Your task is to write a Python script that converts figures, requested and entered by the user, to Roman numerals. It is a fantastic Python exercise to practice dictionaries and loops.
- The program should take user input for the figure to be converted.
- Implement the conversion algorithm using one of the three methods described below.
- Display the Roman numeral equivalent of the input figure.
Roman numerals are a numeral system that originated in ancient Rome and were used widely throughout the Roman Empire. Instead of using a positional system like the modern decimal system (0-9), Roman numerals use a combination of letters to represent numbers. The basic symbols in the Roman numeral system are:
- I: 1
- V: 5
- X: 10
- L: 50
- C: 100
- D: 500
- M: 1000
To represent larger numbers, the symbols are combined. For example, the number 6 is represented as “VI” (5 + 1), and the number 14 is represented as “XIV” (10 + 1 + 1 + 1)
Steps
- Create a dictionary that maps each Roman numeral to its corresponding decimal value.
- Initialize an empty string variable to store the Roman numeral.
- Take user input for the figure to be converted.
- Compare the input figure with the base values in descending order.
- Divide the input figure by the base value and repeat the process until the input figure becomes zero.
- For each division, append the corresponding Roman symbol to the result string.
- Display the result string as the Roman numeral equivalent of the input figure.
Expected Outcome
## Input: "Enter the figure to be converted: " 1550
## Output: Roman numeral equivalent: MDL
Python practice question source code
def convert_to_roman(num):
roman_dict = {1000: 'M', 900: 'CM', 500: 'D', 400: 'CD', 100: 'C', 90: 'XC', 50: 'L', 40:
'XL', 10: 'X', 9: 'IX', 5: 'V', 4: 'IV', 1: 'I'}
roman_num = ''
for base, symbol in roman_dict.items():
while num >= base:
roman_num += symbol
num -= base
return roman_num
input_num = int(input("Enter the figure to be converted: "))
result = convert_to_roman(input_num)
print("Roman numeral equivalent:", result)
