```
#include <iostream>
#include <cstring>
#include <QString>
using namespace std;

class A {
public:
    static const int i = 9;
    static const int PI = 1.3;
    static const char ch = 's';
    static const string str = "hello world"; // <--- error
    static const QString str2 = "hello world"; // <--- error
};

int main(int argc, char **argv) {
    cout << "Hello world" << endl;

    return 0 ;
}

```

As the code gives everything, how can I init a string.