Qt项目-简单的计算器

#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); a.clear(); b.clear(); } Widget::~Widget() { delete ui; } void Widget::on_pushButton_1_clicked() { a += "1"; ui->lineEdit->setText(a); } void Widget::on_pushButton_2_clicked() { a += "2"; ui->lineEdit->setText(a); } void Widget::on_pushButton_3_clicked() { a += "3"; ui->lineEdit->setText(a); } void Widget::on_pushButton_4_clicked() { a += "4"; ui->lineEdit->setText(a); } void Widget::on_pushButton_5_clicked() { a += "5"; ui->lineEdit->setText(a); } void Widget::on_pushButton_6_clicked() { a += "6"; ui->lineEdit->setText(a); } void Widget::on_pushButton_7_clicked() { a += "7"; ui->lineEdit->setText(a); } void Widget::on_pushButton_8_clicked() { a += "8"; ui->lineEdit->setText(a); } void Widget::on_pushButton_9_clicked() { a += "9"; ui->lineEdit->setText(a); } void Widget::on_pushButton_0_clicked() { a += "0"; ui->lineEdit->setText(a); } //加法 void Widget::on_pushButton_add_clicked() { b.insert(0,a); a.clear(); b.insert(1,"+"); ui->lineEdit->setText(a); } //等于 void Widget::on_pushButton_equit_clicked() { if (!a.isEmpty() && !b.isEmpty()) { b.insert(2, a); int v3; if (b.at(1) == "+") { v3 = QString(b.at(0)).toInt() + QString(b.at(2)).toInt(); ui->lineEdit->setText(QString::number(v3)); } else if (b.at(1) == "-") { v3 = QString(b.at(0)).toInt() - QString(b.at(2)).toInt(); ui->lineEdit->setText(QString::number(v3)); } else if (b.at(1) == "*") { v3 = QString(b.at(0)).toInt() * QString(b.at(2)).toInt(); ui->lineEdit->setText(QString::number(v3)); } else if (b.at(1) == "/") { v3 = QString(b.at(0)).toInt() / QString(b.at(2)).toInt(); ui->lineEdit->setText(QString::number(v3)); } // 清空a和b，同时将结果保存到a，以便后续计算 a = QString::number(v3); b.clear(); } else { b.insert(0, a); a.clear(); } } //减法 void Widget::on_pushButton_Sub_clicked() { b.insert(0,a); a.clear(); b.insert(1,"-"); ui->lineEdit->setText(a); } //乘法 void Widget::on_pushButton_Mult_clicked() { b.insert(0,a); a.clear(); b.insert(1,"*"); ui->lineEdit->setText(a); } //除法 void Widget::on_pushButton_divi_clicked() { b.insert(0,a); a.clear(); b.insert(1,"/"); ui->lineEdit->setText(a); } //清除键 void Widget::on_pushButton_clear_clicked() { a.clear(); b.clear(); ui->lineEdit->setText("0"); }