About functions and lineEdit

[Project try]

@
#include <QApplication>
#include<QLabel>
#include<QHBoxLayout>
#include<QLineEdit>
#include<QIntValidator>
#include <QWidget>

int sum(int x,int y){
return x+y;
}

int main(int argc, char *argv[])
{
int x;
int y;
QApplication a(argc, argv);

QLabel *check=new QLabel(QObject::tr("Add numbers:"));

QHBoxLayout *left=new QHBoxLayout;

left->addWidget(check);
 QValidator *Valid=new QIntValidator();

QLineEdit *edit =new QLineEdit;
edit->setMaximumWidth(5);
edit->setFixedWidth(5);
check->setBuddy(edit);
edit->setValidator(Valid);
QObject::connect(edit,SIGNAL(editingFinished()),edit,SLOT(setText(x)));
QLineEdit *edit1=new QLineEdit;
edit1->setMaximumWidth(5);
edit1->setFixedWidth(5);
check->setBuddy(edit1);
edit1->setValidator(Valid);
QObject::connect(edit1,SIGNAL(editingFinished()),edit1,SLOT(setText(y)));
        left->addWidget(edit);
QHBoxLayout *Mainlayout=new QHBoxLayout;
Mainlayout->addLayout(left);

setLayout(Mainlayout);

sum(x,y);

return a.exec();

}

@

[SGaist]

That won't do what you want at all.

You are calling setLayout in main and not on a widget

Also your connection statements are wrong.

Please, have a look at some of Qt's example to see how things work

[Project try]

Well , that's the only way I would learn is by making mistakes :D , that's why I wanted to do it my way before trying what you guys have told me.

by the way why can't I call it in main ? should I include something first ?

[Project try]

and could you please tell me where should I call it ?

[SGaist]

setLayout is a function of QWidget, so you need a QWidget object.

[Project try]

what if I made a class and inherited qwidget ? or there's a better way ?

[Project try]

Oh , so I could just create a pointer to that object and use that pointer to set the layout ? and if I wanted to make bigger programs I should just inherit it on my classes ?

[SGaist]

Subclass QWidget, it's the correct way to go here.

You really should take a look at Qt's demos and examples, that will give you a good ground to build on

[Project try]

I really looked at some examples about two weeks ago " I don't have much time " since I've been busy with my midterms exams :(

but I'll finish this one , hopefully it will work then I'll look at some examples tomorrow.

[Project try]

about converting from string to int , should always do this ? is there a way to just take an integer or any type i want from the user ?

[Project try]

I think I'll create a new class to do these things , specially that this won't work because there's no reference. is it ok if I posted on this thread tomorrow ? or it's against the rules to bump a thread with +12 hours without posting ?

thanks man , I really appreciate your help.

[SGaist]

It's better not to bump 24 hours is the common time interval.

If you want integers directly, use a QSpinBox, it will simplify your program