Stuff

#include <string>
#include <iostream>
using namespace std;
int main()
{
        string s;

        cout << "enter input: ";
        getline(cin, s);

        for(string::iterator si = s.begin(); si != s.end(); si++)
                *si+=5;

        cout << "encrypted string: \"" << s << "\"" << std::endl;

        char input;

        cout << "do you wish to decrypt it? ";
        cin >> input;

        switch(input)
        {
                case 'y':
                case 'Y':
                {
                        for(string::iterator si = s.begin(); si != s.end(); si++)
                                *si-=5;

                        cout << "decrypted string: \"" << s << "\"" << std::endl;

                        break;
                }
        }
        return 0;
}