Why doesn't QTextStream wait for input?

[fyodor]

In this little program why doesn't in wait for input?

#include <QtCore>
 
int main(int argc, char *argv[])
{
    QTextStream in(stdin, QIODevice::ReadOnly);
    QTextStream out(stdout, QIODevice::WriteOnly);
 
    QString str;
    out << "Enter something: ";
    in << str;
    out << "hello " << str << "\n";
 
    return 0;
}

#include <QtCore>

int main(int argc, char *argv[])
{
    QTextStream in(stdin, QIODevice::ReadOnly);
    QTextStream out(stdout, QIODevice::WriteOnly);

    QString str;
    out << "Enter something: ";
    in << str;
    out << "hello " << str << "\n";

    return 0;
}

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When i execute this i get

Enter something: hello 
Press <RETURN> to close this window...

Enter something: hello 
Press <RETURN> to close this window...

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So what is going on that i don't understand?