caesar

Implement a program that encrypts messages using Caesar’s cipher, per the below.

$ ./caesar 13
plaintext:  HELLO
ciphertext: URYYB

Usage

Your program should behave per the examples below. Assumed that the underlined text is what some user has typed.

$ ./caesar 1
plaintext:  HELLO
ciphertext: IFMMP

$ ./caesar 13
plaintext:  hello, world
ciphertext: uryyb, jbeyq

$ ./caesar 13
plaintext:  be sure to drink your Ovaltine
ciphertext: or fher gb qevax lbhe Binygvar

$ ./caesar
Usage: ./caesar k

$ ./caesar 1 2 3 4 5
Usage: ./caesar k

For more info: docs