Qt way to read from stdin.

console.cpp

#include <iostream>
#include "console.hpp"

void Console::run()
{
    std::cout << "First message" << std::endl;
    std::cout << "> " << std::flush;
    connect(m_notifier, SIGNAL(activated(int)), this, SLOT(readCommand()));
}

void Console::readCommand()
{
    std::string line;
    std::getline(std::cin, line);
    if (std::cin.eof() || line == "quit") {
        std::cout << "Good bye!" << std::endl;
        emit quit();
    } else {
        std::cout << "Echo: " << line << std::endl;
        std::cout << "> " << std::flush;
    }
}

console.hpp

#pragma once

#include <QObject>
#include <QSocketNotifier>
#include <iostream>

class Console : public QObject
{
    Q_OBJECT;

public:
    Console();

    void run();

signals:
    void quit();

private:
    QSocketNotifier *m_notifier;

private slots:
    void readCommand();
};

inline Console::Console()
{
    m_notifier = new QSocketNotifier(fileno(stdin), QSocketNotifier::Read, this);
}

main.cpp

#include "console.hpp"
#include <QCoreApplication>

int main(int argc, char** argv)
{
    QCoreApplication app(argc, argv);
    Console console;
    console.run();
    QObject::connect(&console, SIGNAL(quit()), &app, SLOT(quit()));
    return app.exec();
}

There is another example