1、新建calculatorstandard類和工程檔案
2、使用水平布局和把按鍵依次新增
ui介面如下圖所示：
3、在calculatorstandard.h中宣告用到的槽函式
private slots:
void digitclicked ();//數字按鍵
void addandsubclicked();//加減按鍵
void mulandderivativeclicked();//乘除按鍵
void equalclicked();//等號按鍵
void clearall();//清楚按鍵
void clear();
void backspaceclicked();//空格按鍵
void pointclicked();//小數點按鍵
void mcclicked();//清除記憶資料
void mrclicked();//新增記憶資料
void msclicked();//讀取記憶資料
void mplusclicked();//清除記憶資料
void plusminusclicked();//加減按鍵
void otheroperatorclicked();//開方。平方，求導數等
4、在calculatorstandard.cpp中實現槽函式
void calculatorstandard::digitclicked()
if (waitingforoperand)
ui->lineedit_display->settext(ui->lineedit_display->text() + qstring::number(digitvalue));
}void calculatorstandard::unaryoperatorclicked()
result = sqrt(operand);
} else if (clickedoperator == tr("x^2")) else if (clickedoperator == tr("1/x"))
result = 1.0 / operand;
}ui->lineedit_display->settext(qstring::number(result));
waitingforoperand = true;
}void calculatorstandard::additiveoperatorclicked()
qdebug()<< pendingadditiveoperator.isempty() settext(qstring::number(sumsofar));
} else
pendingadditiveoperator = clickedoperator;
waitingforoperand = true;
}void calculatorstandard::multiplicativeoperatorclicked()
ui->lineedit_display->settext(qstring::number(factorsofar));
} else
pendingmultiplicativeoperator = clickedoperator;
waitingforoperand = true;
}void calculatorstandard::equalclicked()
operand = factorsofar;
factorsofar = 0.0;
pendingmultiplicativeoperator.clear();
}if (!pendingadditiveoperator.isempty())
pendingadditiveoperator.clear();
} else
ui->lineedit_display->settext(qstring::number(sumsofar));
sumsofar = 0.0;
waitingforoperand = true;
}void calculatorstandard::pointclicked()
void calculatorstandard::changesignclicked()
else if (value < 0.0)
ui->lineedit_display->settext(text);
}void calculatorstandard::backspaceclicked()
ui->lineedit_display->settext(text);
}void calculatorstandard::clear()
void calculatorstandard::clearall()
void calculatorstandard::clearmemory()
void calculatorstandard::readmemory()
void calculatorstandard::setmemory()
void calculatorstandard::addtomemory()
void calculatorstandard::abortoperation()
bool calculatorstandard::calculate(double rightoperand, const qstring &pendingoperator)
else if (pendingoperator == tr("-")) else if (pendingoperator == tr("*")) else if (pendingoperator == tr("/"))
return true;
}5、執行結果如下圖所示
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