Chapter 21, Problem 21.15E

Program Plan Intro

Program Plan:

• Include header files.
• Start main function.
• Accept cryptogram letter in “ a”.
• Accept replacement letter in “ b ”.
• Check if “ a ” is space or not.
• If it is not space, then check if “a-13” will go below character 'a'. if yes then use “msg=a+13” to rotate by 13 character.
else decrement by 13 to decipher.

• Check if “msg” is same as variable "b", then convert to upper and display the character else display "wrong replacement".