博客
关于我
Qt 简易计算器小程序
阅读量:315 次
发布时间:2019-03-03

本文共 2708 字,大约阅读时间需要 9 分钟。

刚接触Qt,没有使用QtDesigner来编写ui文件,纯vs编写

calculator.h与calculator.cpp由自己编写,main.cpp与ui_calculator.h由vs生成

calculator.h

#pragma once#pragma execution_character_set("utf-8")#include 
#include "ui_calculator.h"#include
#include
#include
#include
#include
#include
class calculator : public QMainWindow{ Q_OBJECTpublic: calculator(QWidget *parent = Q_NULLPTR);public slots : void jisuan();private: Ui::calculatorClass ui; QLabel *number_1; QLabel *number_2; QLineEdit *numline_1; QLineEdit *numline_2; QButtonGroup *oper; QRadioButton *plus; QRadioButton *minus; QRadioButton *multiply; QRadioButton *divide; QLabel *resultlabel; QLineEdit *result; QPushButton *cal; QGridLayout *mainlayout;};

calculator.cpp

#include "calculator.h"calculator::calculator(QWidget *parent)	: QMainWindow(parent){	ui.setupUi(this);	number_1 = new QLabel("数字1:");	number_2 = new QLabel("数字2:");	numline_1 = new QLineEdit;	numline_2 = new QLineEdit;	QRegExp regx("[0-9]+$");	QValidator *validator = new QRegExpValidator(regx);	numline_1->setValidator(validator);	numline_2->setValidator(validator);//限制输入的为数字	oper = new QButtonGroup;	plus = new QRadioButton("+");	minus = new QRadioButton("-");	multiply = new QRadioButton("*");	divide = new QRadioButton("/");	oper->addButton(plus);	oper->addButton(minus);	oper->addButton(multiply);	oper->addButton(divide);	oper->setExclusive(true);	resultlabel = new QLabel("计算结果:");	result = new QLineEdit;	cal = new QPushButton("计算");	cal->setShortcut(QKeySequence(QLatin1String("Enter")));	mainlayout = new QGridLayout(ui.centralWidget);	mainlayout->addWidget(number_1, 0, 0);	mainlayout->addWidget(numline_1, 0, 1,1,3);	mainlayout->addWidget(number_2, 1, 0);	mainlayout->addWidget(numline_2, 1, 1,1,3);	mainlayout->addWidget(plus,2,0);	mainlayout->addWidget(minus, 2, 1);	mainlayout->addWidget(multiply, 2, 2);	mainlayout->addWidget(divide, 2, 3);	mainlayout->addWidget(cal, 3, 0,1,4);	mainlayout->addWidget(resultlabel, 4, 0);	mainlayout->addWidget(result, 4, 1,1,3);		connect(cal, SIGNAL(clicked()), this, SLOT(jisuan()));	}void calculator::jisuan(){	QString n1 = numline_1->text();	QString n2 = numline_2->text();	double num1 = n1.toDouble();	double num2 = n2.toDouble();	double res = 0.0;	if (plus->isChecked())	{		res = num1 + num2;	}	if (minus->isChecked())	{		res = num1 - num2;	}	if (multiply->isChecked())	{		res = num1 * num2;	}	if (divide->isChecked())	{		res = num1 / num2;	}	QRegExp rx;	rx.setPattern("(\\.){0,1}0+$");	QString res2= QString("%1").arg(res, 0, 'f', -1).replace(rx, "");	//使用正则表达式去除小数后多余的0	result->setText(res2);	if (divide->isChecked() && num2 == 0)	{		result->setText("Error");	}}

效果如图

在这里插入图片描述

转载地址:http://apdq.baihongyu.com/

你可能感兴趣的文章
MySQL8修改密码的方法
查看>>
Mysql8在Centos上安装后忘记root密码如何重新设置
查看>>
Mysql8在Windows上离线安装时忘记root密码
查看>>
MySQL8找不到my.ini配置文件以及报sql_mode=only_full_group_by解决方案
查看>>
mysql8的安装与卸载
查看>>
MySQL8,体验不一样的安装方式!
查看>>
MySQL: Host '127.0.0.1' is not allowed to connect to this MySQL server
查看>>
Mysql: 对换(替换)两条记录的同一个字段值
查看>>
mysql:Can‘t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock‘解决方法
查看>>
MYSQL:基础——3N范式的表结构设计
查看>>
MYSQL:基础——触发器
查看>>
Mysql:连接报错“closing inbound before receiving peer‘s close_notify”
查看>>
mysqlbinlog报错unknown variable ‘default-character-set=utf8mb4‘
查看>>
mysqldump 参数--lock-tables浅析
查看>>
mysqldump 导出中文乱码
查看>>
mysqldump 导出数据库中每张表的前n条
查看>>
mysqldump: Got error: 1044: Access denied for user ‘xx’@’xx’ to database ‘xx’ when using LOCK TABLES
查看>>
Mysqldump参数大全(参数来源于mysql5.5.19源码)
查看>>
mysqldump备份时忽略某些表
查看>>
mysqldump实现数据备份及灾难恢复
查看>>