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fix: add input validation to Caesar cipher #1299

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fix: add input validation to Caesar cipher #1299

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7 changes: 7 additions & 0 deletions utilities/Caesar-Cipher/Caesar-Cipher.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,13 @@ def main() -> None:
elif choice in ["E", "ENCRYPT", "D", "DECRYPT"]:
message = input("📝 Enter your message: ")

if not message:
print("❌ Error: Message cannot be empty.\n")
continue

if not any(c.isalpha() for c in message):
print("⚠️ Warning: Message contains no alphabetic characters. Cipher will return unchanged.\n")

try:
shift = int(input("🔑 Enter the shift key (whole number): "))
except ValueError:
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