C++ :: Negating Boolean Values

I made some research on how to negate a boolean value but none seemed to work. Ok, so I have the following code:

Code:

#include <iostream>
using namespace std;
int main() {
bool Turn = true;
for (int i = 1; i < 11; i++)

[Code]....

As of now the code prints "XXXXXXXXXX". And I want it to print "XOXOXOXOXO", so I tried 2 different things, which did not work:

Code:

#include <iostream>
using namespace std;
int main()
{
bool Turn = true;
for (int i = 1; i < 11; i++)
{

[Code]...

Code:

#include <iostream>
using namespace std;
int main()
{
bool Turn = true;
for (int i = 1; i < 11; i++)

[Code]...

Ok so I made those changes so that the boolean 'Turn' would change everytime the loop executed. Guess it doesn't work.