QT实现基本计算器使用

#include "biaozhun.h" #include "ui_biaozhun.h" #include <QDebug> #include<iostream> using namespace std; Biaozhun::Biaozhun(QWidget *parent) : QMainWindow(parent), ui(new Ui::Biaozhun) { ui->setupUi(this); this->setWindowTitle(tr("计算器")); AA="0";//+-*/之后的数字 BB=" "; CC=" "; DD=" ";//记录小数点 k=0; m=0; ui->lineEdit->setEnabled(false); ui->lineEdit->setText("0"); connect(ui->Button0, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button1, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button2, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button3, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button4, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button5, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button6, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button7, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button8, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Button9, SIGNAL(clicked()), this, SLOT(Clicked_())); connect(ui->Buttonchu, SIGNAL(clicked()), this, SLOT(Clicked())); connect(ui->Buttoncheng, SIGNAL(clicked()), this, SLOT(Clicked())); connect(ui->Buttonjia, SIGNAL(clicked()), this, SLOT(Clicked())); connect(ui->Buttonjian, SIGNAL(clicked()), this, SLOT(Clicked())); } Biaozhun::~Biaozhun() { delete ui; } void Biaozhun::Clicked_() { QPushButton* button = qobject_cast<QPushButton *>(sender()); if(k>14) { return; } AA=ui->lineEdit->text(); if((CC!=" "&&(AA=="+"||AA=="-"||AA=="×"||AA=="÷"))||AA=="0") { ui->lineEdit->setText(button->text()); m=0; } else if(CC!=" "&&m==1) { ui->lineEdit->setText(button->text()); CC=" "; BB=" "; m=0; } else { ui->lineEdit->setText(ui->lineEdit->text()+button->text()); } AA=ui->lineEdit->text(); k=AA.length(); } void Biaozhun::Clicked() { QPushButton* button = qobject_cast<QPushButton *>(sender()); AA=ui->lineEdit->text(); if(AA.rightRef(1)=="+"||AA.rightRef(1)=="-"||AA.rightRef(1)=="×"||AA.rightRef(1)=="÷"||AA.rightRef(1)==".") { return; } if(m==0) { BB=AA; ui->lineEdit->setText(button->text()); CC=button->text(); k=0; } else { ui->lineEdit->setText(button->text()); CC=button->text(); k=0; } AA=ui->lineEdit->text(); DD=" "; } void Biaozhun::on_Buttonc_clicked() { ui->lineEdit->setText("0"); AA="0"; BB=" "; CC=" "; DD=" "; k=0; m=0; } void Biaozhun::on_Buttondel_clicked() { if(m==1) { return; } AA=ui->lineEdit->text(); if(AA.rightRef(1)=="+"||AA.rightRef(1)=="-"||AA.rightRef(1)=="×"||AA.rightRef(1)=="÷") { return; } if(AA.rightRef(1)==".") { DD=" "; } QString jisuang = ui->lineEdit->text(); jisuang.chop(1); ui->lineEdit->setText(jisuang); AA=ui->lineEdit->text(); k=AA.length(); if(AA==""){ui->lineEdit->setText("0");k=0;} //if(CC!=" ") //{ //BB=ui->lineEdit->text(); //CC=" "; //} } void Biaozhun::on_Buttonoff_clicked() { close(); } void Biaozhun::on_Buttondian_clicked() { if(k>13) { return; } if(m==1) { ui->lineEdit->setText("0."); m=0; DD="."; AA="0."; return; } AA=ui->lineEdit->text(); if(AA.rightRef(1)=="+"||AA.rightRef(1)=="-"||AA.rightRef(1)=="×"||AA.rightRef(1)=="÷"||AA.rightRef(1)==".") { return; } else { if(DD==" ") { AA.append("."); DD="."; } } ui->lineEdit->setText(AA); k=AA.length(); } void Biaozhun::on_Buttonjiajian_clicked() { AA=ui->lineEdit->text(); if(AA=="0"||AA=="0.") { return; } else if(AA.left(1)=="-")//删除左边的-号 { AA.remove(0,1); } else { AA.prepend("-");//添加-号 } ui->lineEdit->setText(AA); if(CC!=" "&&m==1) { BB=ui->lineEdit->text(); m=0; CC=" "; } } void Biaozhun::on_Buttondeng_clicked() { if(AA.rightRef(1)=="+"||AA.rightRef(1)=="-"||AA.rightRef(1)=="×"||AA.rightRef(1)=="÷"||AA.rightRef(1)==".") { return; } if(CC==" ") { return; } else { if(CC=="+"||CC=="-") { double p=0,q=0; p=BB.toDouble(); q=AA.toDouble(); if(CC=="+") p=p+q; else if(CC=="-") p=p-q; JJ=QString::number(p); } else if(CC=="×"||CC=="÷") { double p=0,q=0; p=BB.toDouble(); q=AA.toDouble(); if(CC=="×") { p=p*q;qDebug("%f",p); JJ=QString::number(p); } else if(CC=="÷") { if(AA=="0") { JJ="Error"; } else { p=p/q; JJ=QString::number(p); } } } k=JJ.length(); ui->lineEdit->setText(JJ); BB=JJ; m=1; } }