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QT-计算器

news 2025/11/30 9:54:44

QT-计算器

一、演示效果
二、关键程序
三、下载链接

一、演示效果

在这里插入图片描述

二、关键程序

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);//基本設置ui->label->setStyleSheet("QLabel { background-color : white;font-size:40px ;}");ui->label->setAlignment(Qt::AlignRight|Qt::AlignCenter);this->setFixedSize(QSize(487,594));this->setWindowTitle(u8"计算器");//連接數字0-9connect(ui->btn_0,&QPushButton::clicked,[=](){QString str=ui->label->text();str.push_back("0");ui->label->setText(str);});connect(ui->btn_1,&QPushButton::clicked,[=](){QString str=ui->label->text()+"1";ui->label->setText(str);});connect(ui->btn_2,&QPushButton::clicked,[=](){QString str=ui->label->text()+"2";ui->label->setText(str);});connect(ui->btn_3,&QPushButton::clicked,[=](){QString str=ui->label->text()+"3";ui->label->setText(str);});connect(ui->btn_4,&QPushButton::clicked,[=](){QString str=ui->label->text()+"4";ui->label->setText(str);});connect(ui->btn_5,&QPushButton::clicked,[=](){QString str=ui->label->text()+"5";ui->label->setText(str);});connect(ui->btn_6,&QPushButton::clicked,[=](){QString str=ui->label->text()+"6";ui->label->setText(str);});connect(ui->btn_7,&QPushButton::clicked,[=](){QString str=ui->label->text()+"7";ui->label->setText(str);});connect(ui->btn_8,&QPushButton::clicked,[=](){QString str=ui->label->text()+"8";ui->label->setText(str);});connect(ui->btn_9,&QPushButton::clicked,[=](){QString str=ui->label->text()+"9";ui->label->setText(str);});//連接 .connect(ui->btn_point,&QPushButton::clicked,[=](){QString oldStr = ui->label->text();//限制只能有一個.int pointNum = oldStr.count(".");if(oldStr == ""||pointNum==1){return;}QString newStr=oldStr+".";ui->label->setText(newStr);});//連接<-connect(ui->btn_back,&QPushButton::clicked,[=](){QString oldStr = ui->label->text();if(oldStr == ""){return;}QString newStr = oldStr.remove(-1,1);ui->label->setText(newStr);});//連接 +connect(ui->btn_add,&QPushButton::clicked,[=](){if(ui->label->text()==""){return;}double value = ui->label->text().toDouble();Value val("+",value);this->allValueAndOperator.push_back(val);ui->label->setText("");});//連接 -connect(ui->btn_minus,&QPushButton::clicked,[=](){if(ui->label->text()==""){return;}double value = ui->label->text().toDouble();Value val("-",value);this->allValueAndOperator.push_back(val);ui->label->setText("");});//連接 *connect(ui->btn_multiply,&QPushButton::clicked,[=](){if(ui->label->text()==""){return;}double value = ui->label->text().toDouble();Value val("*",value);this->allValueAndOperator.push_back(val);ui->label->setText("");});//連接 /connect(ui->btn_divided,&QPushButton::clicked,[=](){if(ui->label->text()==""){return;}double value = ui->label->text().toDouble();Value val("/",value);this->allValueAndOperator.push_back(val);ui->label->setText("");});//連接 =connect(ui->btn_equals,&QPushButton::clicked,[=](){if(ui->label->text()==""){return;}double value = ui->label->text().toDouble();Value val("!",value);this->allValueAndOperator.push_back(val);QVector<Value>::iterator it = this->allValueAndOperator.begin();double res = it->value;for(;it!=this->allValueAndOperator.end();it++){double val = (it+1)->value;if(it->oper=="+"){res+=val;}else if(it->oper=="-"){res-=val;}else if(it->oper=="*"){res*=val;}else if(it->oper=="/"){res/=val;}if((it+1)->oper=="!")break;}ui->label->setNum(res);this->allValueAndOperator.clear();});//連接 clearconnect(ui->btn_clear,&QPushButton::clicked,[=](){this->allValueAndOperator.clear();ui->label->setText("");});//連接 退出connect(ui->btn_close,&QPushButton::clicked,[=](){this->close();});//連接 +/-connect(ui->btn_strains,&QPushButton::clicked,[=](){if(ui->label->text()==""){return;}double val=ui->label->text().toDouble();val=-val;ui->label->setText(QString::number(val));});}MainWindow::~MainWindow()
{delete ui;
}