ROT13 (rotate by 13 places) is a simple letter substitution cipher that is an example of a Caesar cipher used by Julius Caesar. ROT13 replaces a letter with the letter 13 letters after it in the alphabet. (A==>N, B==>O, C==>P, etc...) So, the translation of the word COMPUTER using ROT13 would be PBZCHGRE.

Write a C++ program that asks the user for the name of an input file and translates the contents of that file using ROT13. Your program should also save the results of the translation into another file with a ".rot13" file extension.