Thread: Issue with xoring C++ string

I am trying to use a C++ string as the key for xoring another string.
The program crashes with (0xC0000005) Access violation.
Though it works if the key is declared as char key[260].

Code:

#include <iostream>
#include <string>
using namespace std;

int main()
{
    string buf  = "Value with the position of a character within";
    string key  = "Ak!$s**s1z*z*z*z*abjkvyuildoin*ek-+qsdfghjjop";
    string out;
    int arrSize = buf.length();

    for(int i = 0; i < arrSize; i++)
    {
        out[i] = buf[i] ^ key[i];
    }

    cout << "String size:    " << arrSize << endl;
    cout << "String encrypt: " << buf << "\n\n";

    for(int i = 0; i < arrSize; i++)
    {
        buf[i] = out[i] ^ key[i];
    }

    cout << "String decrypt: " << buf << endl;
    cout << "Key: " << key << endl;

    return 0;
}

1. Your out has no size to start with.

2. If you xor any character with itself, you end up with \0 (aka - the end of the string).

Thank you, that was it.