From 2e5682d6df3e89aaa16be9be631f75d29352c021 Mon Sep 17 00:00:00 2001
From: rudra <r.p.singh7439@gmail.com>
Date: Mon, 3 Aug 2026 23:57:28 +0530
Subject: [PATCH] fix(Converting_Roman_to_Integer): handle missing args, case
 sensitivity, and input validation

---
 .../Converting_Roman_to_Integer.py            | 69 +++++++++++--------
 1 file changed, 41 insertions(+), 28 deletions(-)

diff --git a/Converting_Roman_to_Integer/Converting_Roman_to_Integer.py b/Converting_Roman_to_Integer/Converting_Roman_to_Integer.py
index 5ad1ef3b..29d73e6f 100644
--- a/Converting_Roman_to_Integer/Converting_Roman_to_Integer.py
+++ b/Converting_Roman_to_Integer/Converting_Roman_to_Integer.py
@@ -1,28 +1,41 @@
-import sys
-
-
-romanStr = sys.argv[1]
-romanStr = str(romanStr)
-dict = {
-    'I':1,
-    'V':5,
-    'X':10,
-    'L':50,
-    'C':100,
-    'D':500,
-    'M':1000
-}
-
-num = 0
-
-romanStr = romanStr.replace("IV","IIII")
-romanStr = romanStr.replace("IX","VIIII")
-romanStr = romanStr.replace("XL","XXXX")
-romanStr = romanStr.replace("XC","LXXXX")
-romanStr = romanStr.replace("CD","CCCC")
-romanStr = romanStr.replace("CM","DCCCC")
-myStr = list(romanStr)
-for char in myStr:
-    num = num + dict[char]
-
-print(num)
\ No newline at end of file
+import sys
+
+if len(sys.argv) > 1:
+    romanStr = sys.argv[1]
+else:
+    romanStr = input("Enter a Roman numeral: ")
+
+romanStr = str(romanStr).strip().upper()
+
+if not romanStr:
+    print("Error: No Roman numeral provided.")
+    sys.exit(1)
+
+ROMAN_VALUES = {
+    'I': 1,
+    'V': 5,
+    'X': 10,
+    'L': 50,
+    'C': 100,
+    'D': 500,
+    'M': 1000
+}
+
+invalid_chars = [char for char in romanStr if char not in ROMAN_VALUES]
+if invalid_chars:
+    print(f"Error: Invalid Roman numeral character(s) '{''.join(set(invalid_chars))}'.")
+    sys.exit(1)
+
+num = 0
+
+romanStr = romanStr.replace("IV", "IIII")
+romanStr = romanStr.replace("IX", "VIIII")
+romanStr = romanStr.replace("XL", "XXXX")
+romanStr = romanStr.replace("XC", "LXXXX")
+romanStr = romanStr.replace("CD", "CCCC")
+romanStr = romanStr.replace("CM", "DCCCC")
+
+for char in romanStr:
+    num += ROMAN_VALUES[char]
+
+print(num)
\ No newline at end of file