1. Create a new "Plain C++ Application" project using Creator's wizard.
2. Add lines doing input and output:

       std::string s;
       std::cout << "Enter something: ";
       std::cin >> s;
       std::cout << "You entered: " << s << std::endl;
   

3. Do not use "Run in Terminal".
4. Run the project in Creator.
   The program runs through without stopping.

Instead, the program should behave like it does when started from outside Creator, i.e. it should stop and wait for input to cin.
That Creator doesn't have a way to actually provide such input in this configuration is a separate issue.