How can I make a program of encrypt and decrypt using c++??

Question

Can you help me? :)

Answer 1

To make a program that encrypts a message you can:
1) Use a "key" (from 10 to 15 let's say) and use it in the next steps.
2) Every letter should have a number.
3) Add that key to the numbers of your letters or numbers.
4) Print the letter coresponding to that number.