Qt编写简单计算器-Toy模板网

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一、使用LCD Number、Push Button和GridLayout编辑计算器页面。

qt编写计算器纯代码,qt,ui

二、代码

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
//使用枚举表示运算类型
enum oper
{
    oper_add,
    oper_sub,
    oper_mul,
    oper_div,


};

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private slots:
    void on_pushButton_1_clicked();

    void on_pushButton_2_clicked();

    void on_pushButton_3_clicked();

    void on_pushButton_add_clicked();

    void on_pushButton_4_clicked();

    void on_pushButton_5_clicked();

    void on_pushButton_6_clicked();

    void on_pushButton_sub_clicked();

    void on_pushButton_7_clicked();

    void on_pushButton_8_clicked();

    void on_pushButton_9_clicked();

    void on_pushButton_mul_clicked();

    void on_pushButton_0_clicked();

    void on_pushButton_equ_clicked();

    void on_pushButton_div_clicked();

    void on_pushButton_clear_clicked();

private:
    Ui::Widget *ui;
    //记录当前值
    int num;
    //上一个操作数
    int temp;
    //记录当前运算
    oper op;
};

#endif // WIDGET_H

main.cpp

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

widget.cpp文章来源地址https://www.toymoban.com/news/detail-520789.html

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //初始化
    num = 0;
    temp = 0;
}

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

void Widget::on_pushButton_1_clicked()
{

    num = num*10+1;
//显示
    ui->lcdNumber->display(num);

}

void Widget::on_pushButton_2_clicked()
{
    num = num*10+2;
    //显示
    ui->lcdNumber->display(num);

}

void Widget::on_pushButton_3_clicked()
{
    num = num*10+3;
//显示
    ui->lcdNumber->display(num);
}

void Widget::on_pushButton_4_clicked()
{
    num = num*10+4;
//显示
    ui->lcdNumber->display(num);
}

void Widget::on_pushButton_5_clicked()
{
    num = num*10+5;
//显示
    ui->lcdNumber->display(num);
}

void Widget::on_pushButton_6_clicked()
{
    num = num*10+6;
//显示
    ui->lcdNumber->display(num);
}


void Widget::on_pushButton_7_clicked()
{
    num = num*10+7;
//显示
    ui->lcdNumber->display(num);
}

void Widget::on_pushButton_8_clicked()
{
    num = num*10+8;
//显示
    ui->lcdNumber->display(num);
}

void Widget::on_pushButton_9_clicked()
{
    num = num*10+9;
//显示
    ui->lcdNumber->display(num);
}

void Widget::on_pushButton_0_clicked()
{
    num = num*10;
//显示
    ui->lcdNumber->display(num);
}

void Widget::on_pushButton_add_clicked()
{
    if(temp>0)
    {
        on_pushButton_clear_clicked();
    }
    op = oper_add;
    temp = num;
    num = 0;
}

void Widget::on_pushButton_sub_clicked()
{
    if(temp>0)
    {
        on_pushButton_clear_clicked();
    }
    op = oper_sub;
    temp = num;
    num = 0;
}

void Widget::on_pushButton_mul_clicked()
{
    if(temp>0)
    {
        on_pushButton_clear_clicked();
    }
    op = oper_mul;
    temp = num;
    num = 0;
}

void Widget::on_pushButton_div_clicked()
{
    if(temp>0)
    {
        on_pushButton_clear_clicked();
    }
    op = oper_div;
    temp = num;
    num = 0;
}

void Widget::on_pushButton_equ_clicked()
{
    switch (op) {
    case oper_add:
        num = temp+num;
        break;
    case oper_sub:
        num = temp-num;
        break;
    case oper_mul:
        num = temp*num;
        break;
    case oper_div:
        if(num == 0)
        {
            num = 0;
            temp = 0;
            ui->lcdNumber->display("Err");
            return;
        }
        num = temp/num;
        break;
    }
    temp = 0;
    ui->lcdNumber->display(num);

}



void Widget::on_pushButton_clear_clicked()
{
    num = 0;
    temp = 0;
    ui->lcdNumber->display(num);
}

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