How to encrypt and decrypt the string in C++

This is a simple C++ program to encrypt and decrypt the string.
Encryption basically means encoding a particular message or information so that it can’t be read by other person.
Decryption is the process of decoding that message to make it readable.
We have used a simple method of adding and subtracting a key value for encryption and decryption.
In the above program, if you change the value of key then the encrypted value will be different.
If the user enters other value than 1 or 2 it will show Invalid Input.
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