Create caesar_cipher_encoder__decoder.py

python/caesar_cipher_encoder__decoder.py

@@ -0,0 +1,42 @@
+def encrypt(text, n):
+    encrypted = ""
+    for char in text:
+        if char.isupper():
+            c = ord(char) + (n % 26)
+            if c > ord('Z'):
+                c -= 26
+        elif char.islower():
+            c = ord(char) + (n % 26)
+            if c > ord('z'):
+                c -= 26
+        else:
+            c = ord(char) + 1
+        encrypted += chr(c)
+    return encrypted
+
+def decrypt(text, n):
+    decrypted = ""
+    for char in text:
+        if char.isupper():
+            c = ord(char) - (n % 26)
+            if c < ord('A'):
+                c += 26
+        elif char.islower():
+            c = ord(char) - (n % 26)
+            if c < ord('a'):
+                c += 26
+        else:
+            c = ord(char) - 1
+        decrypted += chr(c)
+    return decrypted
+
+def main():
+    text = input("Enter a string: ")
+    n = int(input("Enter key: "))
+    encrypted_string = encrypt(text, n)
+    print("\nEncrypted text:", encrypted_string)
+    decrypted_string = decrypt(encrypted_string, n)
+    print("Decrypted text:", decrypted_string)
+
+if __name__ == "__main__":
+    main()