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#include?

#include?

#include?“button.h“
#include?“calculator.h“

//!?[0]
int?resu=1;
Calculator::Calculator（QWidget?*parent）
????:?QDialog（parent）
{
????sumInMemory?=?0.0;
????sumSoFar?=?0.0;
????factorSoFar?=?0.0;
????waitingForOperand?=?true;
//!?[0]

//!?[1]
????display?=?new?QLineEdit（“0“）;
//!?[1]?//!?[2]
????display->setReadOnly（true）;
????display->setAlignment（Qt::AlignRight）;
????display->setMaxLength（15）;

????QFont?font?=?display->font（）;
????font.setPointSize（font.pointSize（）?+?8）;
????display->setFont（font）;
//!?[2]

//!?[4]
????for?（int?i?=?0;?i?	digitButtons[i]?=?createButton（QString::number（i）?SLOT（digitClicked（）））;
????}

????Button?*pointButton?=?createButton（tr（“.“）?SLOT（pointClicked（）））;
????Button?*changeSignButton?=?createButton（tr（“\261“）?SLOT（changeSignClicked（）））;

????Button?*backspaceButton?=?createButton（tr（“Backspace“）?SLOT（backspaceClicked（）））;
????Button?*clearButton?=?createButton（tr（“Clear“）?SLOT（clear（）））;
????Button?*clearAllButton?=?createButton（tr（“Clear?All“）?S