Writing console applications with Qt Creator

Remember Hello World in Chapter 1, Getting Started with Qt Creator? That was a console application – about as simple a console application as you can write. Let's recap the code: We created a new Qt console application and, in main.cpp, we wrote the following lines of code:

#include <QCoreApplication> 
#include <iostream> 
 
using namespace std; 
 
int main(int argc, char *argv[]) 
{ 
    QCoreApplication a(argc, argv); 
     
    cout << "Hello world!"; 
 
    return a.exec(); 
} 

Any valid C++ file is valid in a Qt application, including Standard Template Library (STL) code. This is especially handy if you need to write a small tool in C++ and haven't learned a lot about Qt yet – everything you know about C++ (and even C, if you prefer) is accessible to you in Qt Creator.

Although...