C++ Characters not being handled properly

Question

I have a basic encryption program that I have written, it takes input from the user from their encrypted text, usually in the form of Unicode characters. But when I do this:

cout << "Your decrypted string is : " << decryptstring(text, key) << endl;

It gives me the wrong answer and gets the character codes wrong completely such as

è

will be

-118

.

However when i do:

cout << "Your decrypted string is : " << decryptstring("è", key) << endl;

It works seamlessly!

How do I fix this? If you need to see my other code just ask. Thanks

I get text from

getline(cin, text);

decryptstring function:

#include <iostream>

#include <string>

#include <vector>



using namespace std;

string decryptstring(string text, string key)

{

    //Declare variables

    int i = 1;

    int result;

    int tmp;

    int tmp2;





    vector < char > arr;







    //Start decryption

    while(i <= text.length())

    {

        /*

        Get letter from the string and get letter from key

        and use Vigenere cipher to decrypt the data.

        */

        tmp  = text[i - 1];



        tmp2 = key[i - 1];

        cout << tmp << endl;

        //Get encrypted value

        result = tmp - tmp2;

        //Change it into readable stuff

        arr.push_back(result);



        //Increment i

        i++;

    }



    string str(arr.begin(), arr.end());



    return str;

}

Answer 1

You need to use wide characters for unicode.

So have decryptstring thus:

std::wstring decryptstring(const std::wstring& text, const std::wstring& key) {
   // Do stuff
   return text;
}

Then

std::wcout << L"Your decrypted string is : " << decryptstring(text, key) < std::endl;
std::wcout << L"Your decrypted string is : " << decryptstring(L"è", key) << std::endl;

Where

std::wstring text; // is declared before use

C++ Characters not being handled properly

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