add roman_numerals exercise

fifth_stack/README.md

@@ -1,11 +1,11 @@
-# Fifth
+# Fifth Stack
 
 A simple stack-based language called Fifth
 
 ## Usage
 
 ```shell
-python fifth.py
+python fifth_stack.py
 ```
 
 ### Commands
@@ -48,7 +48,7 @@ EXIT
 
 ```bash
 pip install pytest
-pytest -v test_fifth.py
+pytest -v test_fifth_stack.py
 ```
 
 ## Requirements

fifth_stack/test_fifth_stack.py

@@ -1,5 +1,5 @@
 import pytest
-from fifth import FifthStack
+from fifth_stack import FifthStack
 
 
 # Test the functions

roman_numerals/roman_numerals.py

@@ -0,0 +1,36 @@
+import readline
+
+def convert_to_number(numerals: str) -> str:
+    filtered = list(filter(lambda x: x in "IVXCM", list(numerals.upper())))
+    if len(filtered) == 0:
+        return "Invalid input"
+
+    values: list[int] = []
+    for i in range(len(filtered)):
+        match filtered[i]:
+            case "I":
+               values.append(1)
+            case "V":
+                values.append(5)
+            case "X":
+                values.append(10)
+            case "C":
+                values.append(100)
+            case "M":
+                values.append(1000)
+    
+    if len(values) > 1:
+        return f"{''.join(filtered)} = {' + '.join(str(v) for v in values)} = {sum(values)}"
+    else:
+        return f"{''.join(filtered)} = {values[0]}"
+    
+def main():
+    while True:
+        try:
+            numerals = input("Please enter some Roman numerals: ")
+            print(convert_to_number(numerals))
+        except (EOFError, KeyboardInterrupt):
+            break
+
+if __name__ == "__main__":
+    main()

roman_numerals/test_roman_numerals.py

@@ -0,0 +1,38 @@
+import pytest
+from roman_numerals import convert_to_number
+
+def test_valid_single_numerals():
+    assert convert_to_number("I") == "I = 1"
+    assert convert_to_number("V") == "V = 5"
+    assert convert_to_number("X") == "X = 10"
+    assert convert_to_number("C") == "C = 100"
+    assert convert_to_number("M") == "M = 1000"
+
+def test_valid_multiple_numerals():
+    assert convert_to_number("IV") == "IV = 1 + 5 = 6"
+    assert convert_to_number("XCM") == "XCM = 10 + 100 + 1000 = 1110"
+    assert convert_to_number("MCMXCIV") == "MCMXCIV = 1000 + 100 + 1000 + 10 + 100 + 1 + 5 = 2216"
+
+def test_lowercase_input():
+    assert convert_to_number("ivxcm") == "IVXCM = 1 + 5 + 10 + 100 + 1000 = 1116"
+
+def test_mixed_case_input():
+    assert convert_to_number("iVxCm") == "IVXCM = 1 + 5 + 10 + 100 + 1000 = 1116"
+
+def test_invalid_characters():
+    assert convert_to_number("EFGH") == "Invalid input"
+    assert convert_to_number("123") == "Invalid input"
+    assert convert_to_number("!@#") == "Invalid input"
+
+def test_mixed_valid_and_invalid_characters():
+    assert convert_to_number("AIXB") == "IX = 1 + 10 = 11"
+    assert convert_to_number("M1C2") == "MC = 1000 + 100 = 1100"
+
+def test_empty_string():
+    assert convert_to_number("") == "Invalid input"
+
+def test_only_spaces():
+    assert convert_to_number("   ") == "Invalid input"
+
+def test_spaces_and_valid_numerals():
+    assert convert_to_number(" I V ") == "IV = 1 + 5 = 6"