sa01form.ui.h

linux下qt编程的一个入门小程序。qt是跨平台的图形编程环境。

/****************************************************************************
** ui.h extension file, included from the uic-generated form implementation.
**
** If you want to add, delete, or rename functions or slots, use
** Qt Designer to update this file, preserving your code.
**
** You should not define a constructor or destructor in this file.
** Instead, write your code in functions called init() and destroy().
** These will automatically be called by the form's constructor and
** destructor.
*****************************************************************************/


void sa01Form::caculate()
{
    enum OPERATOR
    {
 ADD,
 SUB,
 MUTIPLY,
 DIVID
    };
    
    double num1 = num1LineEdit->text().toDouble();
    double num2 = num2LineEdit->text().toDouble();
    double result = 0.0;
    switch(operatorComboBox->currentItem())
    {
    case ADD:
 result = num1 + num2;
 break;
case SUB:
    result = num1 - num2;
    break;
case MUTIPLY:
    result = num1 * num2;
    break;
case DIVID:
    result = num1 / num2;
    break;
default:
    break;
};
    
    resultLineEdit->setText( QString::number( result, 'f', 5 ) );

 
}
#include <qvalidator.h>
void sa01Form::init()
{
        num1LineEdit->setValidator( new QDoubleValidator( num1LineEdit ) );
 num2LineEdit->setValidator( new QDoubleValidator( num2LineEdit ) );
 num1LineEdit->setText("0.0");
 num2LineEdit->setText("0.0");
 resultLineEdit->setText("0.0");
 
      num1LineEdit->selectAll();
}