(C Program Only, Please not C++)

Using Characters and Strings.

Write a simple program to encrypt a text string using a look-up table or simple algorithm. For instance, the text string Hello World could be encrypted into lfmmp Xpsme simply by translating each character into the next character in the alphabet. Make up your own encryption scheme or table and test it with a program to input the users text string and display it in encrypted form.

Then write a companion program to decrypt the text string encrypted in the first program. You could test it by having the user enter the encrypted output from the first program, and the decryption program should display the original text string.