Qt编写的计算器

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/fei86155/article/details/77592325

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    Init();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::Init()
{
    num = 0;
    total = 0;
    flag = 0;
}

void Widget::on_Btn0_clicked()
{
    a += "0";
    ui->Line1->setText(a);
}

void Widget::on_Btn1_clicked()
{
    a += "1";
    ui->Line1->setText(a);
}

void Widget::on_Btn2_clicked()
{
    a += "2";
    ui->Line1->setText(a);
}

void Widget::on_Btn3_clicked()
{
    a += "3";
    ui->Line1->setText(a);
}

void Widget::on_Btn4_clicked()
{
    a += "4";
    ui->Line1->setText(a);
}

void Widget::on_Btn5_clicked()
{
    a += "5";
    ui->Line1->setText(a);
}

void Widget::on_Btn6_clicked()
{
    a += "6";
    ui->Line1->setText(a);
}

void Widget::on_Btn7_clicked()
{
    a += "7";
    ui->Line1->setText(a);
}

void Widget::on_Btn8_clicked()
{
    a += "8";
    ui->Line1->setText(a);
}

void Widget::on_Btn9_clicked()
{
    a += "9";
    ui->Line1->setText(a);
}


void Widget::on_Btn11_clicked()
{
    b.insert(num,a);
    a.clear();
    b.insert(++num,"+");
    ++num;
    flag = 0;
}


void Widget::on_Btn_equal_clicked()
{
    b.insert(num,a);
    double t = 0;
    int j = 0;
    for(j = 0;j < b.count()-1;j++)
    {
        if(0 == j)
        {
            total = QString(b[j]).toDouble();
        }
        if("+" == b[j])
        {
            t = QString(b[j+1]).toDouble();
            total += t;
        }
        if("-" == b[j])
        {
            t = QString(b[j+1]).toDouble();
            total -= t;
        }
        if("*" == b[j])
        {
            t = QString(b[j+1]).toDouble();
            total *= t;
        }
        if("/" == b[j])
        {
            t = QString(b[j+1]).toDouble();
            total /= t;
        }
    }
    ui->Line1->setText(QString::number(total));
   // total = 0;
    a = QString::number(total);
    b.clear();
    num = 0;
    flag = 0;
}

void Widget::on_Btn_clear_clicked()
{
    ui->Line1->setText(" ");
    a.clear();
    b.clear();
    flag = 0;
}

void Widget::on_Btn22_clicked()
{
    b.insert(num,a);
    a.clear();
    b.insert(++num,"-");
    ++num;
    flag = 0;
}

void Widget::on_Btn33_clicked()
{
    b.insert(num,a);
    a.clear();
    b.insert(++num,"*");
    ++num;
    flag = 0;
}

void Widget::on_Btn44_clicked()
{
    b.insert(num,a);
    a.clear();
    b.insert(++num,"/");
    ++num;
    flag = 0;
}

void Widget::on_Btn_point_clicked()
{
    if(0 == flag)
    {
        a += ".";
        ui->Line1->setText(a);
    }
}