Qt-3-Programul-calculator

Calculator

calculator3.cpp

#include "calculator3.h"<br />#include "ui_calculator3.h"

Calculator3::Calculator3(QWidget '''parent) :<br /> QWidget(parent),<br /> ui(new Ui::Calculator3)<br />{<br /> ui->setupUi(this);
<br /> ui->comboBox->addItem("+", 0);<br /> ui->comboBox->addItem("-", 1);<br /> ui->comboBox->addItem("'''", 2);

ui->label_2->setNum(0);<br /> ui->label_2->setStyleSheet("QLabel { background-color: white}");<br /> ui->label_2->setMaximumWidth(25);

connect(ui->comboBox, SIGNAL (activated(QString)), this, SLOT (calculate(QString)));<br /> connect(ui->spinBox, SIGNAL (valueChanged(int)), this, SLOT (update()));<br /> connect(ui->spinBox_2, SIGNAL (valueChanged(int)), this, SLOT (update()));

}

void Calculator3::calculate(QString string){<br /> if(string  "+"){
        ui->label_2->setNum(ui->spinBox->value() + ui->spinBox_2->value());
    }
    if(string  "-"){<br /> ui->label_2->setNum(ui->spinBox->value() - ui->spinBox_2->value());<br /> }<br /> if(string == "'''"){<br /> ui->label_2->setNum(ui->spinBox->value()''' ui->spinBox_2->value());<br /> }

}

void Calculator3::update(){<br /> if(ui->comboBox->currentIndex()0){
        ui->label_2->setNum(ui->spinBox->value() + ui->spinBox_2->value());
    }
    if(ui->comboBox->currentIndex()1){<br /> ui->label_2->setNum(ui->spinBox->value() - ui->spinBox_2->value());<br /> }<br /> if(ui->comboBox->currentIndex()==2){<br /> ui->label_2->setNum(ui->spinBox->value() * ui->spinBox_2->value());<br /> }<br />}

Calculator3::~Calculator3()<br />{<br /> delete ui;<br />}

calculator3.h

#ifndef CALCULATOR3_H<br />#define CALCULATOR3_H

#include <QWidget><br />#include <QSpinBox><br />#include <QComboBox><br />#include <QLabel>

namespace Ui {<br />class Calculator3;<br />}

class Calculator3 : public QWidget<br />{<br /> Q_OBJECT

public:<br /> explicit Calculator3(QWidget *parent = 0);<br /> ~Calculator3();

private:<br /> Ui::Calculator3 *ui;<br /> QSpinBox *spinBox;<br /> QSpinBox *spinBox_2;<br /> QComboBox *comboBox;<br /> QLabel *label_2;

private slots:<br /> void calculate(QString string);<br /> void update();

};

#endif // CALCULATOR3_H<br />

main.cpp

#include "calculator3.h"<br />#include <QApplication>

int main(int argc, char *argv[])<br />{<br /> QApplication a(argc, argv);<br /> Calculator3 w;<br /> w.show();

return a.exec();<br />}<br />

calculator3.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Calculator3</class>
<widget class="QWidget" name="Calculator3">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>Calculator3</string>
</property>
<widget class="QWidget" name="">
<property name="geometry">
<rect>
<x>20</x>
<y>30</y>
<width>351</width>
<height>29</height>
</rect>
</property>
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<widget class="QSpinBox" name="spinBox">
<property name="minimum">
<number>–999</number>
</property>
<property name="maximum">
<number>999</number>
</property>
</widget>
</item>
<item>
<widget class="QComboBox" name="comboBox"/>
</item>
<item>
<widget class="QSpinBox" name="spinBox_2">
<property name="minimum">
<number>–999</number>
</property>
<property name="maximum">
<number>999</number>
</property>
</widget>
</item>
<item>
<widget class="QLabel" name="label">
<property name="text">
<string>=</string>
</property>
</widget>
</item>
<item>
<widget class="QLabel" name="label_2">
<property name="text">
<string>TextLabel</string>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>