mainwindow.ui Example File

 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
  <class>MainWindow</class>
  <widget class="QWidget" name="MainWindow">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>364</width>
     <height>182</height>
    </rect>
   </property>
   <layout class="QGridLayout" name="gridLayout_2">
    <item row="0" column="0" colspan="2">
     <widget class="QLabel" name="display">
      <property name="frameShape">
       <enum>QFrame::StyledPanel</enum>
      </property>
      <property name="alignment">
       <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
      </property>
     </widget>
    </item>
    <item row="1" column="0">
     <spacer name="horizontalSpacer">
      <property name="orientation">
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="sizeHint" stdset="0">
       <size>
        <width>20</width>
        <height>20</height>
       </size>
      </property>
     </spacer>
    </item>
    <item row="1" column="1">
     <layout class="QGridLayout" name="gridLayout">
      <item row="0" column="0">
       <widget class="QPushButton" name="digit7">
        <property name="text">
         <string>7</string>
        </property>
       </widget>
      </item>
      <item row="3" column="1">
       <widget class="QPushButton" name="point">
        <property name="text">
         <string>.</string>
        </property>
       </widget>
      </item>
      <item row="1" column="1">
       <widget class="QPushButton" name="digit5">
        <property name="text">
         <string>5</string>
        </property>
       </widget>
      </item>
      <item row="0" column="2">
       <widget class="QPushButton" name="digit9">
        <property name="text">
         <string>9</string>
        </property>
       </widget>
      </item>
      <item row="0" column="1">
       <widget class="QPushButton" name="digit8">
        <property name="text">
         <string>8</string>
        </property>
       </widget>
      </item>
      <item row="4" column="2">
       <widget class="QPushButton" name="c">
        <property name="text">
         <string>C</string>
        </property>
       </widget>
      </item>
      <item row="1" column="0">
       <widget class="QPushButton" name="digit4">
        <property name="text">
         <string>4</string>
        </property>
       </widget>
      </item>
      <item row="2" column="3">
       <widget class="QPushButton" name="operStar">
        <property name="text">
         <string>*</string>
        </property>
       </widget>
      </item>
      <item row="2" column="2">
       <widget class="QPushButton" name="digit3">
        <property name="text">
         <string>3</string>
        </property>
       </widget>
      </item>
      <item row="4" column="3">
       <widget class="QPushButton" name="equals">
        <property name="text">
         <string>=</string>
        </property>
       </widget>
      </item>
      <item row="1" column="3">
       <widget class="QPushButton" name="operMinus">
        <property name="text">
         <string>-</string>
        </property>
       </widget>
      </item>
      <item row="2" column="0">
       <widget class="QPushButton" name="digit1">
        <property name="text">
         <string>1</string>
        </property>
       </widget>
      </item>
      <item row="3" column="0">
       <widget class="QPushButton" name="digit0">
        <property name="text">
         <string>0</string>
        </property>
       </widget>
      </item>
      <item row="3" column="3">
       <widget class="QPushButton" name="operDiv">
        <property name="text">
         <string>/</string>
        </property>
       </widget>
      </item>
      <item row="0" column="3">
       <widget class="QPushButton" name="operPlus">
        <property name="text">
         <string>+</string>
        </property>
       </widget>
      </item>
      <item row="1" column="2">
       <widget class="QPushButton" name="digit6">
        <property name="text">
         <string>6</string>
        </property>
       </widget>
      </item>
      <item row="2" column="1">
       <widget class="QPushButton" name="digit2">
        <property name="text">
         <string>2</string>
        </property>
       </widget>
      </item>
     </layout>
    </item>
    <item row="2" column="1">
     <spacer name="verticalSpacer">
      <property name="orientation">
       <enum>Qt::Vertical</enum>
      </property>
      <property name="sizeHint" stdset="0">
       <size>
        <width>20</width>
        <height>10</height>
       </size>
      </property>
     </spacer>
    </item>
   </layout>
  </widget>
  <resources/>
  <connections/>
 </ui>