Display changes of integer variable to lcd number

[micmec]

This is my main function

#include "monitor.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Monitor w;
    w.show();
 
    return a.exec();
}

#include "monitor.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Monitor w;
    w.show();

    return a.exec();
}

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Sorry if it's kind of embarassing because I'm still new to this. The programming languages that I have learned are just C and Java, but I'm still just a student so I just know the basics.