Write a function-based C++ program that reads a c-string from a file (input.txt) and an integer key from the console. Your program should encrypt the string by adding the key value to all its alphabets. Make sure that if adding the key value makes the alphabet go past the letter 'Z' or 'z', you must rollover and start over from 'A' or 'a' respectively. All other non-alphabetic characters should remain the same. Write the encrypted string into an output file (output.txt).

Write a function-based C++ program that reads a c-string from a file (input.txt) and an integer key from the console. Your program should encrypt the string by adding the key value to all its alphabets. Make sure that if adding the key value makes the alphabet go past the letter 'Z' or 'z', you must rollover and start over from 'A' or 'a' respectively. All other non-alphabetic characters should remain the same. Write the encrypted string into an output file (output.txt).

C++ for Engineers and Scientists

4th Edition

ISBN:9781133187844

Author:Bronson, Gary J.

Publisher:Bronson, Gary J.

Chapter9: Completing The Basics

Section9.4: Character Manipulation Functions

Problem 3E

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