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calculatorform.cpp Example File
uitools/multipleinheritance/calculatorform.cpp

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 #include <QtGui>
 #include "calculatorform.h"

 CalculatorForm::CalculatorForm(QWidget *parent)
     : QWidget(parent)
 {
     setupUi(this);
 }

 void CalculatorForm::on_inputSpinBox1_valueChanged(int value)
 {
     outputWidget->setText(QString::number(value + inputSpinBox2->value()));
 }

 void CalculatorForm::on_inputSpinBox2_valueChanged(int value)
 {
     outputWidget->setText(QString::number(value + inputSpinBox1->value()));
 }