Add files via upload

Caeser cipher algorithm was written using Python 3.

Author: erdenahmet11

caeser_cipher_algorithm.py

@@ -0,0 +1,27 @@
+alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
+
+def caeser(text, shift, direction):
+    result_text = ""
+    if direction == "decode":
+        shift *= -1
+    for char in text:
+        if char in alphabet:
+            position = alphabet.index(char)
+            new_position = position + shift
+            new_position = new_position % len(alphabet)
+            result_text += alphabet[new_position]
+        else:
+            result_text += char
+    return result_text
+
+terminate_program = False
+while not terminate_program:
+    direction = input("Type 'encode' to encrypt, type 'decode' to decrypt:\n")
+    text = input("Type the message:\n").lower()
+    shift = int(input("Type the shift:\n"))
+    result = caeser(text, shift, direction)
+    print(result)
+    program_continue = input("If you want to continue type 'yes'. Otherwise type 'no'.\n").lower()
+    if program_continue == "no":
+        terminate_program = True
+        print("The program was terminated.")