Archived:Como criar uma calculadora simples, em Qt

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Revision as of 02:19, 19 December 2011

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 Creating a simple calculator in Qt for Symbian

Por valderind4

Última alteração feita por hamishwillee em 19 Dec 2011

Introdução

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

Pré-requisitos

Baixe e instale a versão atual do Qt para Symbian segundo as instruções deste artigo.

Design do Layout

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 2: / Line 2: @@
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 [[Category:Code Examples]]
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-|keywords=QString, Push Button, Text Label
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+|keywords=QString, Push Button, Text Label
+|id=...
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+|translated-by=[[User:Valderind4]]
+|translated-from-title=Creating a simple calculator in Qt for Symbian
+|translated-from-id=60532 <!-- automated guess -->
+|review-by=<!-- After re-review: [[User:username]] -->
+|review-timestamp= <!-- After re-review: YYYYMMDD -->
+|update-by= <!-- After significant update: [[User:username]]-->
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+|author=[[User:Kiran10182]]
+<!-- The following items are not in the standard metadata template -->
+|category=Qt for Symbian
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 }}
@@ Line 333: / Line 342: @@
 ==Comentário==
 Código de erro resolvido.
+<!-- Translation --> [[en:Creating a simple calculator in Qt for Symbian]]

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Contents

Archived:Como criar uma calculadora simples, em Qt

Revision as of 02:19, 19 December 2011

Dados do artigo

Introdução

Pré-requisitos

Design do Layout

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