Qt-3-Programul-calculator

Calculator

calculator3.cpp

#include &quot;calculator3.h&amp;quot;<br />#include &quot;ui_calculator3.h&amp;quot;

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

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

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

}

void Calculator3::calculate(QString string){<br /> if(string  &amp;quot;+&amp;quot;)&amp;#123;
        ui-&amp;gt;label_2-&amp;gt;setNum(ui-&amp;gt;spinBox-&amp;gt;value() + ui-&amp;gt;spinBox_2-&amp;gt;value());
    &amp;#125;
    if(string  &quot;<s>&quot;){<br /> ui</s>&gt;label_2-&gt;setNum(ui-&gt;spinBox-&gt;value() - ui-&gt;spinBox_2-&gt;value());<br /> }<br /> if(string == &quot;'''&quot;){<br /> ui-&gt;label_2-&gt;setNum(ui-&gt;spinBox-&gt;value()''' ui-&gt;spinBox_2-&gt;value());<br /> }

}

void Calculator3::update(){<br /> if(ui-&gt;comboBox-&gt;currentIndex()0)&amp;#123;
        ui-&amp;gt;label_2-&amp;gt;setNum(ui-&amp;gt;spinBox-&amp;gt;value() + ui-&amp;gt;spinBox_2-&amp;gt;value());
    &amp;#125;
    if(ui-&amp;gt;comboBox-&amp;gt;currentIndex()1){<br /> ui-&gt;label_2-&gt;setNum(ui-&gt;spinBox-&gt;value() - ui-&gt;spinBox_2-&gt;value());<br /> }<br /> if(ui-&gt;comboBox-&gt;currentIndex()==2){<br /> ui-&gt;label_2-&gt;setNum(ui-&gt;spinBox-&gt;value() * ui-&gt;spinBox_2-&gt;value());<br /> }<br />}

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

calculator3.h

#ifndef CALCULATOR3_H<br />#define CALCULATOR3_H

#include &lt;QWidget&amp;gt;<br />#include &lt;QSpinBox&amp;gt;<br />#include &lt;QComboBox&amp;gt;<br />#include &lt;QLabel&amp;gt;

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 &quot;calculator3.h&amp;quot;<br />#include &lt;QApplication&amp;gt;

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

return a.exec&amp;amp;#40;&amp;#41;;<br />}<br />

calculator3.ui

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