Add: Caesar Cipher Encryptor/Decryptor

Author: madhavcodes25

math/Caesar-Cipher/Caesar-Cipher.py

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+print("🔐 Caesar Cipher Encryptor & Decryptor 🔐")
+print("Hide your secret messages or reveal them! \n")
+
+while True:
+    choice = input("🎯 Choose Operation: Encrypt (E), Decrypt (D), or Quit (Q): ").upper()
+
+    if choice in ["Q", "QUIT"]:
+        break
+        
+    elif choice in ["E", "D"]:
+        message = input("📝 Enter your message: ")
+        
+        try:
+            shift = int(input("🔑 Enter the shift key (whole number): "))
+        except ValueError:
+            print("❌ Error: Shift key must be a valid whole number.\n")
+            continue
+            
+        # If decrypting, we just reverse the shift direction
+        if choice == "D":
+            shift = -shift
+            
+        result = ""
+        
+        # Core Caesar Cipher Logic
+        for char in message:
+            if char.isalpha():
+                # Determine ASCII boundary (uppercase vs lowercase)
+                start = ord('A') if char.isupper() else ord('a')
+                
+                # Shift character and wrap around using modulo 26
+                shifted_pos = (ord(char) - start + shift) % 26
+                new_char = chr(start + shifted_pos)
+                result += new_char
+            else:
+                # Leave spaces, numbers, and punctuation untouched
+                result += char
+                
+        print("\n✨ Resulting Message:")
+        print(f"👉 {result}\n")
+        
+    else:
+        print("⚠️ Invalid input. Please type E, D, or Q.\n")
+
+print("\n👋 Thanks for using the Caesar Cipher! Stay secure! 🕵️‍♂️\n")