What is wrong with my code?

**Dante** · 1st April 2009, 17:30

Calc++.h

Qt Code:

Switch view

#ifndef CALC++_H
#define CALC++_H
 
#include <QDialog>
#include "ui_Calc++.h"
class calc:public QDialog ,public Ui::Calc{
	Q_OBJECT
	private slots:
		void edig(const char &num);
		void set_op_op1(const char &op);
		void compute_result();
	public:
		calc(QWidget *parent=0);
	private:
		double op1,op2;
		char ope;};
#endif

#ifndef CALC++_H
#define CALC++_H

#include <QDialog>
#include "ui_Calc++.h"
class calc:public QDialog ,public Ui::Calc{
	Q_OBJECT
	private slots:
		void edig(const char &num);
		void set_op_op1(const char &op);
		void compute_result();
	public:
		calc(QWidget *parent=0);
	private:
		double op1,op2;
		char ope;};
#endif

To copy to clipboard, switch view to plain text mode

Calc++.cpp

Qt Code:

Switch view

#include <QtGui>
#include "Calc++.h"
calc::calc(QWidget *parent):QDialog(parent){
	lineEdit->setValidator(new QRegexpValidator(QDoubleValidator,this));
	QObject::connect(cls,SIGNAL(clicked()),lineEdit,SLOT(clear()));
	QObject::connect(_1,SIGNAL(clicked()),lineEdit,SLOT(edig(_1->text())));
	QObject::connect(_2,SIGNAL(clicked()),lineEdit,SLOT(edig(_2->text())));
	QObject::connect(_3,SIGNAL(clicked()),lineEdit,SLOT(edig(_3->text())));
	QObject::connect(_4,SIGNAL(clicked()),lineEdit,SLOT(edig(_4->text())));
	QObject::connect(_5,SIGNAL(clicked()),lineEdit,SLOT(edig(_5->text())));
	QObject::connect(_6,SIGNAL(clicked()),lineEdit,SLOT(edig(_6->text())));
	QObject::connect(_7,SIGNAL(clicked()),lineEdit,SLOT(edig(_7->text())));
	QObject::connect(_8,SIGNAL(clicked()),lineEdit,SLOT(edig(_8->text())));
	QObject::connect(_9,SIGNAL(clicked()),lineEdit,SLOT(edig(_9->text())));
	QObject::connect(_10,SIGNAL(clicked()),lineEdit,SLOT(edig(_10->text())));
	QObject::connect(point,SIGNAL(clicked()),lineEdit,SLOT(edig(point->text())));
	QObject::connect(unmin,SIGNAL(clicked()),lineEdit,SLOT(edig('u')));
	QObject::connect(plus,SIGNAL(clicked()),lineEdit,SLOT(set_op_op1('+')));
	QObject::connect(minus,SIGNAL(clicked()),lineEdit,SLOT(set_op_op1('-')));
	QObject::connect(multiply,SIGNAL(clicked()),lineEdit,SLOT(set_op_op1('*')));
	QObject::connect(division,SIGNAL(clicked()),lineEdit,SLOT(set_op_op1('/')));
	QObject::connect(equal,SIGNAL(clicked()),lineEdit,SLOT(compute_result()));}
void calc::edig(const char &num){
	if(num=='u') lineEdit->setText(QString((char)((lineEdit->text().toDouble())*(-1))));
	else lineEdit->setText(lineEdit->text()+num);}
void calc::set_op_op1(const char &op){
	op1=(lineEdit->text()).toDouble();
	ope=op;
	lineEdit->clear();}
void calc::compute_result(){
	op2=(lineEdit->text()).toDouble();
	switch(ope){
		case '+':
			lineEdit->setText(QString((char)(op1+op2)));
			break;
		case '-':
			lineEdit->setText(QString((char)(op1-op2)));
			break;
		case '*':
			lineEdit->setText(QString((char)(op1*op2)));
			break;
		case '/':
			lineEdit->setText(QString((char)(op1/op2)));
			break;}}

#include <QtGui>
#include "Calc++.h"
calc::calc(QWidget *parent):QDialog(parent){
	lineEdit->setValidator(new QRegexpValidator(QDoubleValidator,this));
	QObject::connect(cls,SIGNAL(clicked()),lineEdit,SLOT(clear()));
	QObject::connect(_1,SIGNAL(clicked()),lineEdit,SLOT(edig(_1->text())));
	QObject::connect(_2,SIGNAL(clicked()),lineEdit,SLOT(edig(_2->text())));
	QObject::connect(_3,SIGNAL(clicked()),lineEdit,SLOT(edig(_3->text())));
	QObject::connect(_4,SIGNAL(clicked()),lineEdit,SLOT(edig(_4->text())));
	QObject::connect(_5,SIGNAL(clicked()),lineEdit,SLOT(edig(_5->text())));
	QObject::connect(_6,SIGNAL(clicked()),lineEdit,SLOT(edig(_6->text())));
	QObject::connect(_7,SIGNAL(clicked()),lineEdit,SLOT(edig(_7->text())));
	QObject::connect(_8,SIGNAL(clicked()),lineEdit,SLOT(edig(_8->text())));
	QObject::connect(_9,SIGNAL(clicked()),lineEdit,SLOT(edig(_9->text())));
	QObject::connect(_10,SIGNAL(clicked()),lineEdit,SLOT(edig(_10->text())));
	QObject::connect(point,SIGNAL(clicked()),lineEdit,SLOT(edig(point->text())));
	QObject::connect(unmin,SIGNAL(clicked()),lineEdit,SLOT(edig('u')));
	QObject::connect(plus,SIGNAL(clicked()),lineEdit,SLOT(set_op_op1('+')));
	QObject::connect(minus,SIGNAL(clicked()),lineEdit,SLOT(set_op_op1('-')));
	QObject::connect(multiply,SIGNAL(clicked()),lineEdit,SLOT(set_op_op1('*')));
	QObject::connect(division,SIGNAL(clicked()),lineEdit,SLOT(set_op_op1('/')));
	QObject::connect(equal,SIGNAL(clicked()),lineEdit,SLOT(compute_result()));}
void calc::edig(const char &num){
	if(num=='u') lineEdit->setText(QString((char)((lineEdit->text().toDouble())*(-1))));
	else lineEdit->setText(lineEdit->text()+num);}
void calc::set_op_op1(const char &op){
	op1=(lineEdit->text()).toDouble();
	ope=op;
	lineEdit->clear();}
void calc::compute_result(){
	op2=(lineEdit->text()).toDouble();
	switch(ope){
		case '+':
			lineEdit->setText(QString((char)(op1+op2)));
			break;
		case '-':
			lineEdit->setText(QString((char)(op1-op2)));
			break;
		case '*':
			lineEdit->setText(QString((char)(op1*op2)));
			break;
		case '/':
			lineEdit->setText(QString((char)(op1/op2)));
			break;}}

To copy to clipboard, switch view to plain text mode

ui_Calc++.h

Qt Code:

Switch view

/********************************************************************************
** Form generated from reading ui file 'Calc++.ui'
**
** Created: Wed Mar 4 15:07:20 2009
**      by: Qt User Interface Compiler version 4.5.0
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/
 
#ifndef UI_CALC_2B__2B__H
#define UI_CALC_2B__2B__H
 
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QDialog>
#include <QtGui/QHeaderView>
#include <QtGui/QLineEdit>
#include <QtGui/QPushButton>
 
QT_BEGIN_NAMESPACE
 
class Ui_Calc
{
public:
    QPushButton *point;
    QPushButton *cls;
    QPushButton *_3;
    QPushButton *plus;
    QPushButton *_7;
    QPushButton *division;
    QPushButton *_6;
    QPushButton *_5;
    QPushButton *_1;
    QPushButton *unmin;
    QPushButton *_4;
    QPushButton *_8;
    QPushButton *_9;
    QPushButton *_2;
    QPushButton *_10;
    QLineEdit *lineEdit;
    QPushButton *equal;
    QPushButton *minus;
    QPushButton *multiply;
 
    void setupUi(QDialog *Calc)
    {
        if (Calc->objectName().isEmpty())
            Calc->setObjectName(QString::fromUtf8("Calc"));
        Calc->resize(245, 163);
        point = new QPushButton(Calc);
        point->setObjectName(QString::fromUtf8("point"));
        point->setGeometry(QRect(100, 130, 31, 23));
        cls = new QPushButton(Calc);
        cls->setObjectName(QString::fromUtf8("cls"));
        cls->setGeometry(QRect(200, 40, 31, 41));
        _3 = new QPushButton(Calc);
        _3->setObjectName(QString::fromUtf8("_3"));
        _3->setGeometry(QRect(100, 40, 31, 23));
        plus = new QPushButton(Calc);
        plus->setObjectName(QString::fromUtf8("plus"));
        plus->setGeometry(QRect(150, 40, 31, 23));
        _7 = new QPushButton(Calc);
        _7->setObjectName(QString::fromUtf8("_7"));
        _7->setGeometry(QRect(20, 100, 31, 23));
        division = new QPushButton(Calc);
        division->setObjectName(QString::fromUtf8("division"));
        division->setGeometry(QRect(150, 130, 31, 21));
        _6 = new QPushButton(Calc);
        _6->setObjectName(QString::fromUtf8("_6"));
        _6->setGeometry(QRect(100, 70, 31, 23));
        _5 = new QPushButton(Calc);
        _5->setObjectName(QString::fromUtf8("_5"));
        _5->setGeometry(QRect(60, 70, 31, 23));
        _1 = new QPushButton(Calc);
        _1->setObjectName(QString::fromUtf8("_1"));
        _1->setGeometry(QRect(20, 40, 31, 23));
        unmin = new QPushButton(Calc);
        unmin->setObjectName(QString::fromUtf8("unmin"));
        unmin->setGeometry(QRect(20, 130, 31, 23));
        _4 = new QPushButton(Calc);
        _4->setObjectName(QString::fromUtf8("_4"));
        _4->setGeometry(QRect(20, 70, 31, 23));
        _8 = new QPushButton(Calc);
        _8->setObjectName(QString::fromUtf8("_8"));
        _8->setGeometry(QRect(60, 100, 31, 23));
        _9 = new QPushButton(Calc);
        _9->setObjectName(QString::fromUtf8("_9"));
        _9->setGeometry(QRect(100, 100, 31, 23));
        _2 = new QPushButton(Calc);
        _2->setObjectName(QString::fromUtf8("_2"));
        _2->setGeometry(QRect(60, 40, 31, 23));
        _10 = new QPushButton(Calc);
        _10->setObjectName(QString::fromUtf8("_10"));
        _10->setGeometry(QRect(60, 130, 31, 23));
        lineEdit = new QLineEdit(Calc);
        lineEdit->setObjectName(QString::fromUtf8("lineEdit"));
        lineEdit->setGeometry(QRect(10, 10, 231, 21));
        equal = new QPushButton(Calc);
        equal->setObjectName(QString::fromUtf8("equal"));
        equal->setGeometry(QRect(200, 90, 31, 61));
        minus = new QPushButton(Calc);
        minus->setObjectName(QString::fromUtf8("minus"));
        minus->setGeometry(QRect(150, 70, 31, 23));
        multiply = new QPushButton(Calc);
        multiply->setObjectName(QString::fromUtf8("multiply"));
        multiply->setGeometry(QRect(150, 100, 31, 23));
 
        retranslateUi(Calc);
 
        QMetaObject::connectSlotsByName(Calc);
    } // setupUi
 
    void retranslateUi(QDialog *Calc)
    {
        Calc->setWindowTitle(QApplication::translate("Calc", "Dialog", 0, QApplication::UnicodeUTF8));
        point->setText(QApplication::translate("Calc", ".", 0, QApplication::UnicodeUTF8));
        cls->setText(QApplication::translate("Calc", "&CLS", 0, QApplication::UnicodeUTF8));
        _3->setText(QApplication::translate("Calc", "3", 0, QApplication::UnicodeUTF8));
        plus->setText(QApplication::translate("Calc", "+", 0, QApplication::UnicodeUTF8));
        _7->setText(QApplication::translate("Calc", "7", 0, QApplication::UnicodeUTF8));
        division->setText(QApplication::translate("Calc", "/", 0, QApplication::UnicodeUTF8));
        _6->setText(QApplication::translate("Calc", "6", 0, QApplication::UnicodeUTF8));
        _5->setText(QApplication::translate("Calc", "5", 0, QApplication::UnicodeUTF8));
        _1->setText(QApplication::translate("Calc", "1", 0, QApplication::UnicodeUTF8));
        unmin->setText(QApplication::translate("Calc", "+/-", 0, QApplication::UnicodeUTF8));
        _4->setText(QApplication::translate("Calc", "4", 0, QApplication::UnicodeUTF8));
        _8->setText(QApplication::translate("Calc", "8", 0, QApplication::UnicodeUTF8));
        _9->setText(QApplication::translate("Calc", "9", 0, QApplication::UnicodeUTF8));
        _2->setText(QApplication::translate("Calc", "2", 0, QApplication::UnicodeUTF8));
        _10->setText(QApplication::translate("Calc", "0", 0, QApplication::UnicodeUTF8));
        lineEdit->setText(QString());
        equal->setText(QApplication::translate("Calc", "=", 0, QApplication::UnicodeUTF8));
        minus->setText(QApplication::translate("Calc", "-", 0, QApplication::UnicodeUTF8));
        multiply->setText(QApplication::translate("Calc", "*", 0, QApplication::UnicodeUTF8));
        Q_UNUSED(Calc);
    } // retranslateUi
 
};
 
namespace Ui {
    class Calc: public Ui_Calc {};
} // namespace Ui
 
QT_END_NAMESPACE
 
#endif // UI_CALC_2B__2B__H

/********************************************************************************
** Form generated from reading ui file 'Calc++.ui'
**
** Created: Wed Mar 4 15:07:20 2009
**      by: Qt User Interface Compiler version 4.5.0
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/

#ifndef UI_CALC_2B__2B__H
#define UI_CALC_2B__2B__H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QDialog>
#include <QtGui/QHeaderView>
#include <QtGui/QLineEdit>
#include <QtGui/QPushButton>

QT_BEGIN_NAMESPACE

class Ui_Calc
{
public:
    QPushButton *point;
    QPushButton *cls;
    QPushButton *_3;
    QPushButton *plus;
    QPushButton *_7;
    QPushButton *division;
    QPushButton *_6;
    QPushButton *_5;
    QPushButton *_1;
    QPushButton *unmin;
    QPushButton *_4;
    QPushButton *_8;
    QPushButton *_9;
    QPushButton *_2;
    QPushButton *_10;
    QLineEdit *lineEdit;
    QPushButton *equal;
    QPushButton *minus;
    QPushButton *multiply;

    void setupUi(QDialog *Calc)
    {
        if (Calc->objectName().isEmpty())
            Calc->setObjectName(QString::fromUtf8("Calc"));
        Calc->resize(245, 163);
        point = new QPushButton(Calc);
        point->setObjectName(QString::fromUtf8("point"));
        point->setGeometry(QRect(100, 130, 31, 23));
        cls = new QPushButton(Calc);
        cls->setObjectName(QString::fromUtf8("cls"));
        cls->setGeometry(QRect(200, 40, 31, 41));
        _3 = new QPushButton(Calc);
        _3->setObjectName(QString::fromUtf8("_3"));
        _3->setGeometry(QRect(100, 40, 31, 23));
        plus = new QPushButton(Calc);
        plus->setObjectName(QString::fromUtf8("plus"));
        plus->setGeometry(QRect(150, 40, 31, 23));
        _7 = new QPushButton(Calc);
        _7->setObjectName(QString::fromUtf8("_7"));
        _7->setGeometry(QRect(20, 100, 31, 23));
        division = new QPushButton(Calc);
        division->setObjectName(QString::fromUtf8("division"));
        division->setGeometry(QRect(150, 130, 31, 21));
        _6 = new QPushButton(Calc);
        _6->setObjectName(QString::fromUtf8("_6"));
        _6->setGeometry(QRect(100, 70, 31, 23));
        _5 = new QPushButton(Calc);
        _5->setObjectName(QString::fromUtf8("_5"));
        _5->setGeometry(QRect(60, 70, 31, 23));
        _1 = new QPushButton(Calc);
        _1->setObjectName(QString::fromUtf8("_1"));
        _1->setGeometry(QRect(20, 40, 31, 23));
        unmin = new QPushButton(Calc);
        unmin->setObjectName(QString::fromUtf8("unmin"));
        unmin->setGeometry(QRect(20, 130, 31, 23));
        _4 = new QPushButton(Calc);
        _4->setObjectName(QString::fromUtf8("_4"));
        _4->setGeometry(QRect(20, 70, 31, 23));
        _8 = new QPushButton(Calc);
        _8->setObjectName(QString::fromUtf8("_8"));
        _8->setGeometry(QRect(60, 100, 31, 23));
        _9 = new QPushButton(Calc);
        _9->setObjectName(QString::fromUtf8("_9"));
        _9->setGeometry(QRect(100, 100, 31, 23));
        _2 = new QPushButton(Calc);
        _2->setObjectName(QString::fromUtf8("_2"));
        _2->setGeometry(QRect(60, 40, 31, 23));
        _10 = new QPushButton(Calc);
        _10->setObjectName(QString::fromUtf8("_10"));
        _10->setGeometry(QRect(60, 130, 31, 23));
        lineEdit = new QLineEdit(Calc);
        lineEdit->setObjectName(QString::fromUtf8("lineEdit"));
        lineEdit->setGeometry(QRect(10, 10, 231, 21));
        equal = new QPushButton(Calc);
        equal->setObjectName(QString::fromUtf8("equal"));
        equal->setGeometry(QRect(200, 90, 31, 61));
        minus = new QPushButton(Calc);
        minus->setObjectName(QString::fromUtf8("minus"));
        minus->setGeometry(QRect(150, 70, 31, 23));
        multiply = new QPushButton(Calc);
        multiply->setObjectName(QString::fromUtf8("multiply"));
        multiply->setGeometry(QRect(150, 100, 31, 23));

        retranslateUi(Calc);

        QMetaObject::connectSlotsByName(Calc);
    } // setupUi

    void retranslateUi(QDialog *Calc)
    {
        Calc->setWindowTitle(QApplication::translate("Calc", "Dialog", 0, QApplication::UnicodeUTF8));
        point->setText(QApplication::translate("Calc", ".", 0, QApplication::UnicodeUTF8));
        cls->setText(QApplication::translate("Calc", "&CLS", 0, QApplication::UnicodeUTF8));
        _3->setText(QApplication::translate("Calc", "3", 0, QApplication::UnicodeUTF8));
        plus->setText(QApplication::translate("Calc", "+", 0, QApplication::UnicodeUTF8));
        _7->setText(QApplication::translate("Calc", "7", 0, QApplication::UnicodeUTF8));
        division->setText(QApplication::translate("Calc", "/", 0, QApplication::UnicodeUTF8));
        _6->setText(QApplication::translate("Calc", "6", 0, QApplication::UnicodeUTF8));
        _5->setText(QApplication::translate("Calc", "5", 0, QApplication::UnicodeUTF8));
        _1->setText(QApplication::translate("Calc", "1", 0, QApplication::UnicodeUTF8));
        unmin->setText(QApplication::translate("Calc", "+/-", 0, QApplication::UnicodeUTF8));
        _4->setText(QApplication::translate("Calc", "4", 0, QApplication::UnicodeUTF8));
        _8->setText(QApplication::translate("Calc", "8", 0, QApplication::UnicodeUTF8));
        _9->setText(QApplication::translate("Calc", "9", 0, QApplication::UnicodeUTF8));
        _2->setText(QApplication::translate("Calc", "2", 0, QApplication::UnicodeUTF8));
        _10->setText(QApplication::translate("Calc", "0", 0, QApplication::UnicodeUTF8));
        lineEdit->setText(QString());
        equal->setText(QApplication::translate("Calc", "=", 0, QApplication::UnicodeUTF8));
        minus->setText(QApplication::translate("Calc", "-", 0, QApplication::UnicodeUTF8));
        multiply->setText(QApplication::translate("Calc", "*", 0, QApplication::UnicodeUTF8));
        Q_UNUSED(Calc);
    } // retranslateUi

};

namespace Ui {
    class Calc: public Ui_Calc {};
} // namespace Ui

QT_END_NAMESPACE

#endif // UI_CALC_2B__2B__H

To copy to clipboard, switch view to plain text mode

Hi
With due attention to codes above,I have 2 questions.
1-When I wanna run it,I get the Don't send message.What is the problem?
2-Whit due attention to line 4 of Calc++.cpp,Is it the right syntax for setting a validator for a lineEdit to QDoubleValidator?If not,tell the right one.thanks

**spirit** · 1st April 2009, 17:36

very cool connection

QObject::connect(cls,SIGNAL(clicked()),lineEdit,SL OT(clear()));
QObject::connect(_1,SIGNAL(clicked()),lineEdit,SLO T(edig(_1->text())));
QObject::connect(_2,SIGNAL(clicked()),lineEdit,SLO T(edig(_2->text())));
QObject::connect(_3,SIGNAL(clicked()),lineEdit,SLO T(edig(_3->text())));
QObject::connect(_4,SIGNAL(clicked()),lineEdit,SLO T(edig(_4->text())));
QObject::connect(_5,SIGNAL(clicked()),lineEdit,SLO T(edig(_5->text())));
QObject::connect(_6,SIGNAL(clicked()),lineEdit,SLO T(edig(_6->text())));
QObject::connect(_7,SIGNAL(clicked()),lineEdit,SLO T(edig(_7->text())));
QObject::connect(_8,SIGNAL(clicked()),lineEdit,SLO T(edig(_8->text())));
QObject::connect(_9,SIGNAL(clicked()),lineEdit,SLO T(edig(_9->text())));
QObject::connect(_10,SIGNAL(clicked()),lineEdit,SL OT(edig(_10->text())));
QObject::connect(point,SIGNAL(clicked()),lineEdit, SLOT(edig(point->text())));
QObject::connect(unmin,SIGNAL(clicked()),lineEdit, SLOT(edig('u')));
QObject::connect(plus,SIGNAL(clicked()),lineEdit,S LOT(set_op_op1('+')));
QObject::connect(minus,SIGNAL(clicked()),lineEdit, SLOT(set_op_op1('-')));
QObject::connect(multiply,SIGNAL(clicked()),lineEd it,SLOT(set_op_op1('*')));
QObject::connect(division,SIGNAL(clicked()),lineEd it,SLOT(set_op_op1('/')));
QObject::connect(equal,SIGNAL(clicked()),lineEdit, SLOT(compute_result()));}

read this
PS. variables names "_<number>" pretty cool too.

**pastor** · 1st April 2009, 17:42

1) You forgot setupUi(this)

Qt Code:

Switch view

calc::calc(QWidget *parent):QDialog(parent){
    setupUi(this);
    ....
}

calc::calc(QWidget *parent):QDialog(parent){
    setupUi(this);
    ....
}

To copy to clipboard, switch view to plain text mode

2) Please see Line Edits Example (QTDIR/examples/widgets/lineedits/)

PS: Hmmm, Is this 1st April joke?

**spirit** · 1st April 2009, 17:57

Originally Posted by Dante

2-Whit due attention to line 4 of Calc++.cpp,Is it the right syntax for setting a validator for a lineEdit to QDoubleValidator?If not,tell the right one.thanks

try this

Qt Code:

Switch view

...
lineEdit->setValidator(new QDoubleValidator(-999.0, 999.0, 2, lineEdit));
...

...
lineEdit->setValidator(new QDoubleValidator(-999.0, 999.0, 2, lineEdit));
...

To copy to clipboard, switch view to plain text mode

btw, is it some kind of joke? your code it is not runable at all.

**Dante** · 2nd April 2009, 12:58

I got it running but the only button that works correctly is "CLS".
I think the connections have some problems as you said.
So could you tell me what is wrong with them?
And What is so funny?I'm just a beginner who wants some help.
thanks again

**pastor** · 2nd April 2009, 13:06

Okay, sorry.

Can you zip your project and attach it here? I will try to help you.

**spirit** · 2nd April 2009, 16:45

Originally Posted by Dante

And What is so funny?I'm just a beginner who wants some help.

I apologize if I hurt you, but code really strange (looks like a joke). did you folow by this link?
so, you have to rewrite you connections like this

Qt Code:

Switch view

...
connect(cls,SIGNAL(clicked()),lineEdit,SLOT(clear()));
connect(_1,SIGNAL(clicked()), SLOT(setLineEditText()));
...
void calc::setLineEditText()
{
     QPushButton *pb = qobject_cast<QPushButton *>(sender());
     if (!pd)
        return;
 
     edig(pd->text());
}
...

...
connect(cls,SIGNAL(clicked()),lineEdit,SLOT(clear()));
connect(_1,SIGNAL(clicked()), SLOT(setLineEditText()));
...
void calc::setLineEditText()
{
     QPushButton *pb = qobject_cast<QPushButton *>(sender());
     if (!pd)
        return;
      
     edig(pd->text());
}
...

To copy to clipboard, switch view to plain text mode

setLineEditText it's a slot which you have to declare in you h-file.

**Dante** · 2nd April 2009, 18:26

Hey Could you explain about the 7th line of your code!
And You mean connect has an overloaded version with 3 parameters?
And no you didn't hurt me.I just wanted to say "well every one starts somewhere".
And heres the link for downloading my project.
Calc++
Thanks again

**spirit** · 2nd April 2009, 18:32

Originally Posted by Dante

Hey Could you explain about the 7th line of your code!

read this

Originally Posted by Dante

And You mean connect has an overloaded version with 3 parameters?

this is equivalent to this

Qt Code:

Switch view

connect(_1,SIGNAL(clicked()), this, SLOT(setLineEditText()));

connect(_1,SIGNAL(clicked()), this, SLOT(setLineEditText()));

To copy to clipboard, switch view to plain text mode

Originally Posted by Dante

And heres the link for downloading my project.
Calc++
Thanks again

I can't donwload an archive. error 404

EDITED: correct link http://dante91.persiangig.com/Calc%2B%2B.zip

**spirit** · 3rd April 2009, 08:52

I've modified your example a little bit

**faldzip** · 3rd April 2009, 11:19

And I can't see any layouts... I suggest using layouts, as it can make you sure your app will look properly in any conditions :]

**Dante** · 4th April 2009, 08:30

Hello again
I tried to add sth new to the calculator.and i was successful except about sqrt,sin,cos and tan because qmake gave error below about them:

[address] ~ can not be used as a function

I included <cmath>.pow,log,sinh,cosh and tanh work well.
And one more question.

lineEdit->setValidator(new QDoubleValidator(-1e100,1e100,10,lineEdit));

I think this command makes the lineEdit to accept every double to 10 floating point digits but it accepts more digits after floating point.and if you wanna show a floating point number,it shows just 5 digits after floating point and if you wanna show more tha 6 zeros it transforms to scientific notation.

**Dante** · 5th April 2009, 16:53

Excuse me but can someone answer my question

**wysota** · 5th April 2009, 18:10

What is the question?

**Dante** · 5th April 2009, 20:48

Oh your right
well how can i use sin,cos,tan and sqrt
and how can i make the lineEdit to show numbers with more than 6 zeros(not user input)without using scientific notation and how can i make it to show floating pomt numbers with more than 5 digits after point(not user input) and one thing about user input the second quoted line in my two last post must make the lineEdit to accept just 10 integers after point but you can enter as many as you want.
How can i correct problems above?

**spirit** · 5th April 2009, 21:05

Originally Posted by Dante

Oh your right
well how can i use sin,cos,tan and sqrt

just include "#include <math.h>".

**wysota** · 5th April 2009, 23:36

Originally Posted by spirit

just include "#include <math.h>".

Or better yet "#include <cmath>" and use the std namespace.

About significant digits - remember floats have a limited precision. Use double instead of float wherever necessary. Scientific notation and "regular" notation has nothing to do with precision. If the precision is not what you wanted and you know the datatype can handle the required precision, it means you must have made a mistake while setting up the widget.

**Dante** · 6th April 2009, 06:28

I included <cmath> and entered the line:

using namespace std

but it still gives the same error
and what you mean by making a mistake while setting up the widget?

**wysota** · 6th April 2009, 06:37

Ok, but what is the error?

**Dante** · 6th April 2009, 07:17

The one in i mentioned in my fourth post.

[address] ~ can not be used as a function

Thread: What is wrong with my code?

Thread Tools

Search Thread

Display

What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Re: What is wrong with my code?

Similar Threads

copyright and gpl

Qt 4.3.0 lots of Bugs!

Pasting code from code tag in emacs

Qt Cryptographic Architecture

Bookmarks

Bookmarks

Posting Permissions