Question

I wrote this program in Qt Creator but I’m not sure how to run it. Here is my code:

#include <QtCore/QCoreApplication>
using namespace std;
#include <iostream>

int main(int argc, char *argv[])
{ 
   QCoreApplication a(argc, argv);

   string str;
   cin >> str;
   cout << " str is : " << str;
   return a.exec();
}

When I run it my console shows this:

Starting /home/hamed/qt programs/test3-build-desktop/test3...

…and nothing happens. What should I do?

Answer 1

When copy pasting your code, it runs for me as expected (well, it doesn’t terminate, but runs). Here is what I did in command line:

cd testproject
qmake -project
qmake
make
./testproject

As mentioned in the comment above, Qt itself is a library, so you are probably referring to some IDE when saying running it from “within Qt” – behaviour there is solely dependent on what IDE you are using.

Update:

From your message

Starting /home/hamed/qt programs/test3-build-desktop/test3...

I assume that you are using the QtCreator IDE, which does not allow you to enter things to console when running. I don’t know whether you can get it to do so, but it works if you enter your project directory in console and use ./projectname. The building part mentioned above will be handled by QtCreator.

Another update:

Check out this thread for information on how to get it to work directly from QtCreator.