caesar_cipher has been added

codeasarjun · web-flow · commit c917fb1968e3 · 2024-09-08T10:07:43.000+05:30
diff --git a/projects/caesar-cipher/caesar_cipher.py b/projects/caesar-cipher/caesar_cipher.py
@@ -0,0 +1,42 @@
+def encrypt(text, shift):
+    result = ""
+    for char in text:
+        if char.isalpha():
+            shift_amount = shift % 26
+            base = ord('A') if char.isupper() else ord('a')
+            result += chr((ord(char) - base + shift_amount) % 26 + base)
+        else:
+            result += char
+    return result
+
+def decrypt(text, shift):
+    return encrypt(text, -shift)
+
+def main():
+    while True:
+        print("Select operation:")
+        print("1. Encrypt")
+        print("2. Decrypt")
+        print("3. Exit")
+        
+        choice = input("Enter choice (1-3): ")
+
+        if choice == '3':
+            break
+        
+        if choice in ['1', '2']:
+            text = input("Enter text: ")
+            shift = int(input("Enter shift value: "))
+
+            if choice == '1':
+                result = encrypt(text, shift)
+                print(f"Encrypted text: {result}")
+            elif choice == '2':
+                result = decrypt(text, shift)
+                print(f"Decrypted text: {result}")
+
+        else:
+            print("Invalid choice")
+
+if __name__ == "__main__":
+    main()
