Archived:Como criar uma calculadora simples, em Qt

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Latest revision as of 04:13, 11 October 2012

Aquivado: Este artigo foi arquivado, pois o conteúdo não é mais considerado relevante para se criar soluções comerciais atuais. Se você achar que este artigo ainda é importante, inclua o template {{ForArchiveReview|escreva a sua justificativa}}.

Qt Quick should be used for all UI development on mobile devices. The approach described in this article (based on QWidget) is deprecated.

Este trecho de código demonstra como criar uma simples calculadora usando Qt.

Dados do artigo

Testado com

Aparelho(s): Emulator

Compatibilidade

Plataforma(s): S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition

Artigo

Palavras-chave: QString, Push Button, Text Label

Tradução:

Originado de Archived:Creating a simple calculator using QWidgets

Por valderind4

Última alteração feita por hamishwillee em 11 Oct 2012

Arquivo de cabeçalho

Cal.h

#ifndef CAL_H
#define CAL_H
 
#include <QtGui/QWidget>
#include "ui_cal.h"
#include<QString>
#include<QPushButton>
#include<QLineEdit>
#include<QHBoxLayout>
#include<QVBoxLayout>
#include<QFormLayout>
class cal : public QWidget
{
    Q_OBJECT
 
public:
	cal(QWidget *parent = 0);
    ~cal();
 
private:
    QPushButton *but1;
    QPushButton *sub;
    QPushButton *mul;
    QPushButton *div;
    QPushButton *eq;
    QFormLayout *lay;
    QLineEdit *line;
    QString str;
    QString str1;
    QString ch;
    QString strResult;
private slots:
   void addi();
   void subs();
   void mult();
   void divi();
   void em();
public:
        float num;
        float num1;
        float ans;
};
 
#endif // CAL_H

Código fonte

cal.cpp

#include "cal.h"
 
cal::cal(QWidget *parent)
    : QWidget(parent)
{
	lay=new QFormLayout(this);
        but1=new QPushButton("+",this);
        sub=new QPushButton("-",this);
        mul=new QPushButton("*",this);
        div=new QPushButton("/",this);
        eq=new QPushButton("=",this);
        line=new QLineEdit(this);
        line->setMaxLength(12);
        lay->addWidget(line);
        lay->addWidget(but1)
        lay->addWidget(sub);
        lay->addWidget(mul);
        lay->addWidget(div);
        lay->addWidget(eq);
        setLayout(lay);
        QObject::connect(but1,SIGNAL(clicked()),this,SLOT(addi()));
        QObject::connect(sub,SIGNAL(clicked()),this,SLOT(subs()));
        QObject::connect(mul,SIGNAL(clicked()),this,SLOT(mult()));
        QObject::connect(div,SIGNAL(clicked()),this,SLOT(divi()));
        QObject::connect(eq,SIGNAL(clicked()),this,SLOT(em()));
}
 
cal::~cal()
{
 // No need to delete any object that got a parent that is properly deleted.
 
}
void cal::addi()
{
                str=line->text();
                num=str.toFloat();
                ch=but1->text();
                line->clear();
}
void cal::subs()
{
                str=line->text();
                num=str.toFloat();
                ch=sub->text();
                line->clear();
}
void cal::mult()
{
                str=line->text();
                num=str.toFloat();
                ch=mul->text();
                line->clear();
}
void cal::divi()
{
                str=line->text();
                num=str.toFloat();
                ch=div->text();
                line->clear();
}
void cal::em()
{
 
 
        str1 = line->text();
        num1 = str1.toFloat();
        if (ch=="+")
        {
                ans=num+num1;
        }
        else if(ch=="-")
        {
                ans=num-num1;
        }
        else if(ch=="*")
        {
                ans=num*num1;
        }
        else if(ch=="/")
        {
                ans=num/num1;
        }
        else
        {
               strResult = strResult.number(ans);
                line->setText(strResult);
        }
        strResult = strResult.number(ans);
        line->setText(strResult);
        ch="";
}

Captura de tela

Entrada de algum valor na linha de edição.

Operação decimal também é possível na calculadora.

Design da UI

QtCalculator.ui

Arquivo de cabeçalho

QtCalculator.h

#ifndef QTCALCULATOR_H
#define QTCALCULATOR_H
 
#include <QtGui/QWidget>
#include "ui_QtCalculator.h"
 
class QtCalculator : public QWidget
{
    Q_OBJECT
 
public:
	QtCalculator(QWidget *parent = 0);
    ~QtCalculator();
 
public slots:
	void Addition();
	void Subtraction();
	void Multiplication();
	void Division();
 
private:
    Ui::QtCalculatorClass ui;
};
 
#endif // QTCALCULATOR_H

Código fonte

QtCalculator.cpp

#include "QtCalculator.h"
 
QtCalculator::QtCalculator(QWidget *parent)
    : QWidget(parent)
{
	ui.setupUi(this);
	QObject::connect(ui.plusButton, SIGNAL(clicked()), this, SLOT(Addition()));
	QObject::connect(ui.minusButton,SIGNAL(clicked()), this, SLOT(Subtraction()));
	QObject::connect(ui.multiplyButton,SIGNAL(clicked()), this, SLOT(Multiplication()));
	QObject::connect(ui.divisionButton,SIGNAL(clicked()), this, SLOT(Division()));
}
 
QtCalculator::~QtCalculator()
{
	QString strFisrt = ui.lineEditNumber1->text();
	QString strSecond = ui.lineEditNumber2->text();
 
	bool ok;
	int number1 = strFisrt.toInt(&ok);
	int number2 = strSecond.toInt(&ok);
	int result = number1 + number2;
 
	QString strResult;
	strResult = strResult.number(result);
	ui.lineEditResult->setText(strResult);
}
 
void QtCalculator::Addition()
{
	QString strFisrt = ui.lineEditNumber1->text();
	QString strSecond = ui.lineEditNumber2->text();
 
	bool ok;
	int number1 = strFisrt.toInt(&ok);
	int number2 = strSecond.toInt(&ok);
	int result = number1 + number2;
 
	QString strResult;
	strResult = strResult.number(result);
	ui.lineEditResult->setText(strResult);	
}
 
void QtCalculator::Subtraction()
{
	QString strFisrt = ui.lineEditNumber1->text();
	QString strSecond = ui.lineEditNumber2->text();
 
	bool ok;
	int number1 = strFisrt.toInt(&ok);
	int number2 = strSecond.toInt(&ok);
	int result = number1 - number2;
 
	QString strResult;
	strResult = strResult.number(result);
	ui.lineEditResult->setText(strResult);
}
 
void QtCalculator::Multiplication()
{
	QString strFisrt = ui.lineEditNumber1->text();
	QString strSecond = ui.lineEditNumber2->text();
 
	bool ok;
	int number1 = strFisrt.toInt(&ok);
	int number2 = strSecond.toInt(&ok);
	int result = number1 * number2;
 
	QString strResult;
	strResult = strResult.number(result);
	ui.lineEditResult->setText(strResult);
}
 
void QtCalculator::Division()
{
	QString strFisrt = ui.lineEditNumber1->text();
	QString strSecond = ui.lineEditNumber2->text();
 
	bool ok;
	int number1 = strFisrt.toInt(&ok);
	int number2 = strSecond.toInt(&ok);
	int result = number1 / number2;
 
	QString strResult;
	strResult = strResult.number(result);
	ui.lineEditResult->setText(strResult);
}

Conclusões

Será mostrada um simples calculadora na tela.

Exemplo

Faça o download do exemplo trabalhado neste link: QtCalculator.zip

Feedback

Se você econtrar algum problema na implementação desta simples calculadora, então por favor escreva seu feedback na página deste artigo Comment page (Inglês). Eu tentarei dá o máximo para tentar ajudar você.

Comentário

Código de erro resolvido.

@@ Line 1: / Line 1: @@
+{{Archived|language=Lang-Portuguese|timestamp=20120216044749|user=[[User:Hamishwillee|&lt;br /&gt;----]]|[[:Category:Qt Quick|Qt Quick]] should be used for all UI development on mobile devices. The approach described in this article (based on {{Qapiname|QWidget}}) is deprecated.}}
 [[Category:Lang-Portuguese]][[Category:Qt C++ UI]][[Category:Code Examples]][[Category:MeeGo Harmattan]][[Category:Symbian]]
 {{Abstract|Este trecho de código demonstra como criar uma simples calculadora usando [[Qt (Portuguese)|Qt]].}}
-{{Archived|language=Lang-Portuguese|timestamp=20120216044749|user=[[User:Hamishwillee|&lt;br /&gt;----]]|[[:Category:Qt Quick|Qt Quick]] should be used for all UI development on mobile devices. The approach described in this article (based on {{Qapiname|QWidget}}) is deprecated.}}
 {{ArticleMetaData <!-- v1.2 -->
 |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
@@ Line 15: / Line 15: @@
 |language= Lang-Portuguese
 |translated-by= [[User:Valderind4]]
-|translated-from-title= Creating a simple calculator using QWidgets
+|translated-from-title= Archived:Creating a simple calculator using QWidgets
 |translated-from-id= 60532 <!-- automated guess -->
 |review-by= <!-- After re-review: [[User:username]] -->
@@ Line 27: / Line 27: @@
 == Arquivo de cabeçalho ==
 === Cal.h===
-<code cpp>
+<code cpp-qt>
 #ifndef CAL_H
@@ Line 77: / Line 77: @@
 == Código fonte ==
 ===cal.cpp===
-<code cpp>
+<code cpp-qt>
 #include "cal.h"
@@ Line 188: / Line 188: @@
 ==Arquivo de cabeçalho==
 === QtCalculator.h===
-<code cpp>
+<code cpp-qt>
 #ifndef QTCALCULATOR_H
 #define QTCALCULATOR_H
@@ Line 219: / Line 219: @@
 ==Código fonte==
 === QtCalculator.cpp===
-<code cpp>
+<code cpp-qt>
 #include "QtCalculator.h"
@@ Line 322: / Line 322: @@
 ==Comentário==
 Código de erro resolvido.
-<!-- Translation --> [[en:Creating a simple calculator using QWidgets]]
+<!-- Translation --> [[en:Archived:Creating a simple calculator using QWidgets]]

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Archived:Como criar uma calculadora simples, em Qt

Latest revision as of 04:13, 11 October 2012

Dados do artigo

Contents

Arquivo de cabeçalho

Cal.h

Código fonte

cal.cpp

Captura de tela

Design da UI

QtCalculator.ui

Arquivo de cabeçalho

QtCalculator.h

Código fonte

QtCalculator.cpp

Conclusões

Exemplo

Feedback

Comentário