Why does QCoreApplication a(argc, argv) exist inside main(int argc, char *argv[]) in a Qt console application? What does it do? What is its purpose?
if I remove it, a program like the following runs without issues
#include <QCoreApplication> #include "animal.h" int main(int argc, char *argv[]) { //QCoreApplication a(argc, argv); { // this is just a dummy scope for the destructor to work // create instances of class animal animal cat(NULL, "Garfield"); animal dog(NULL, "Azor"); // perform actions with the object's functions cat.weight = 10; qDebug() << "Cat Weight in Lbs:" << cat.weightInLbs(); cat.speak("meow"); // perform actions with the object's functions dog.weight = 35; qDebug() << "Dog Weight in Lbs:" << dog.weightInLbs(); dog.speak("wooof"); } //return a.exec(); return 0; }
Source: Windows Questions C++