qt编程简单的计算器

1、QT编程实现简易的计算器一、 实验目的1) 熟悉QtCreator的简单操作。 2) 了解Qt程序编写框架。 3) 了解信号和槽机制，熟练掌握信号与槽在应用程序中的使用。 二、 实验内容 1) 查看API手册，学习简单的Qt类的使用，如QLineEdit、QPushButton等。 2) 用QtCreator创建工程，用Qt编写计算器程序。 3) 对计算器程序进行移植。 三、 实验步骤 1. 创建工程 1)

2、 打开QtCreator，如图1所示。 选择File->New File or Project，然后在弹出的对话框中选择Other Project->Empty Qt project（如图2所示），然后进入下一步。  选择Qt版本，这里选择使用Qt4.7.1，取消对Qt in PATH的选择（如图4所示），然后进入下一步，完成新工程的创建（如图5所示）。实现代码Calcuulator.h代码：#ifndef CALCULATOR_H#define CALCULAT

3、OR_H#include<QApplication>#include<QDialog>#include<QPushButton>#include<QLineEdit>class Calculator:public QDialog Q_OBJECTprotected: QLineEdit *lineEditor; QPushButton *button_0; QPushButton *button_1; QPushButton *button_2; QPushButton *button_3; QPushButton *button_4; QPus

4、hButton *button_5; QPushButton *button_6; QPushButton *button_7; QPushButton *button_8; QPushButton *button_9; QPushButton *button_ce; QPushButton *button_jia; QPushButton *button_jian; QPushButton *button_cheng; QPushButton *button_chu; QPushButton *button_; QPushButton *button_dengyu; int num1,num

5、2,result; / bool zhenghao; / int mark; / char fuhao; / QString S; /public: Calculator();private slots: void button_0_clicked(); void button_1_clicked(); void button_2_clicked(); void button_3_clicked(); void button_4_clicked(); void button_5_clicked(); void button_6_clicked(); void button_7_clicked(

6、); void button_8_clicked(); void button_9_clicked(); void button_ce_clicked(); void button_jia_clicked(); void button_jian_clicked(); void button_cheng_clicked(); void button_chu_clicked(); void button_clicked(); void button_dengyu_clicked();#endif / CALCULATOR_HCalculator.cpp代码：#include<QLayout&

7、gt;#include<QHBoxLayout>#include<QVBoxLayout>#include<QLineEdit>#include<cmath>#include"calculator.h"Calculator:Calculator() num1=0; num2=0; result=0; zhenghao=true; mark=1; lineEditor=new QLineEdit("0"); S="" button_0=new QPushButton("0&quo

8、t;); button_1=new QPushButton("1"); button_2=new QPushButton("2"); button_3=new QPushButton("3"); button_4=new QPushButton("4"); button_5=new QPushButton("5"); button_6=new QPushButton("6"); button_7=new QPushButton("7"); button_8

9、=new QPushButton("8"); button_9=new QPushButton("9"); button_ce=new QPushButton("CE"); button_cheng=new QPushButton("*"); button_jia=new QPushButton("+"); button_jian=new QPushButton("-"); button_chu=new QPushButton("/"); button_=

10、new QPushButton("+/-"); button_dengyu=new QPushButton("="); QHBoxLayout *Hl1=new QHBoxLayout; QHBoxLayout *Hl2=new QHBoxLayout; QHBoxLayout *Hl3=new QHBoxLayout; QHBoxLayout *Hl4=new QHBoxLayout; QHBoxLayout *Hl5=new QHBoxLayout; Hl1->addWidget(lineEditor); Hl1->addWidget(b

11、utton_ce); Hl2->addWidget(button_1); Hl2->addWidget(button_2); Hl2->addWidget(button_3); Hl2->addWidget(button_jia); Hl3->addWidget(button_4); Hl3->addWidget(button_5); Hl3->addWidget(button_6); Hl3->addWidget(button_jian); Hl4->addWidget(button_7); Hl4->addWidget(butto

12、n_8); Hl4->addWidget(button_9); Hl4->addWidget(button_cheng); Hl5->addWidget(button_); Hl5->addWidget(button_0); Hl5->addWidget(button_dengyu); Hl5->addWidget(button_chu); QVBoxLayout *V1=new QVBoxLayout; V1->addLayout(Hl1); V1->addLayout(Hl2); V1->addLayout(Hl3); V1->a

13、ddLayout(Hl4); V1->addLayout(Hl5); connect(button_0,SIGNAL(clicked(),this,SLOT(button_0_clicked(); connect(button_1,SIGNAL(clicked(),this,SLOT(button_1_clicked(); connect(button_2,SIGNAL(clicked(),this,SLOT(button_2_clicked(); connect(button_3,SIGNAL(clicked(),this,SLOT(button_3_clicked(); connec

14、t(button_4,SIGNAL(clicked(),this,SLOT(button_4_clicked(); connect(button_5,SIGNAL(clicked(),this,SLOT(button_5_clicked(); connect(button_6,SIGNAL(clicked(),this,SLOT(button_6_clicked(); connect(button_7,SIGNAL(clicked(),this,SLOT(button_7_clicked(); connect(button_8,SIGNAL(clicked(),this,SLOT(button

15、_8_clicked(); connect(button_9,SIGNAL(clicked(),this,SLOT(button_9_clicked(); connect(button_jia,SIGNAL(clicked(),this,SLOT(button_jia_clicked(); connect(button_jian,SIGNAL(clicked(),this,SLOT(button_jian_clicked(); connect(button_cheng,SIGNAL(clicked(),this,SLOT(button_cheng_clicked(); connect(butt

16、on_chu,SIGNAL(clicked(),this,SLOT(button_chu_clicked(); connect(button_dengyu,SIGNAL(clicked(),this,SLOT(button_dengyu_clicked(); connect(button_ce,SIGNAL(clicked(),this,SLOT(button_ce_clicked(); connect(button_,SIGNAL(clicked(),this,SLOT(button_clicked(); setLayout(V1);void Calculator:button_0_clic

17、ked() S+="0" lineEditor->setText(S); if(mark=1) num1=num1*10+0; else num2=num2*10; void Calculator:button_1_clicked() S+="1" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*10+1; else num1=num1*10-1; else if(zhenghao) num2=num2*10+1; else num2=num2*10-1; void Calc

18、ulator:button_2_clicked() S+="2" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*10+2; else num1=num1*10-2; else if(zhenghao) num2=num2*10+2; else num2=num2*10-2; void Calculator:button_3_clicked() S+="3" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*1

19、0+3; else num1=num1*10-3; else if(zhenghao) num2=num2*10+3; else num2=num2*10-3; void Calculator:button_4_clicked() S+="4" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*10+4; else num1=num1*10-4; else if(zhenghao) num2=num2*10+4; else num2=num2*10-4; void Calculator:button_5

20、_clicked() S+="5" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*10+5; else num1=num1*10-5; else if(zhenghao) num2=num2*10+5; else num2=num2*10-5; void Calculator:button_6_clicked() S+="6" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*10+6; else num1=

21、num1*10-6; else if(zhenghao) num2=num2*10+6; else num2=num2*10-6; void Calculator:button_7_clicked() S+="7" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*10+7; else num1=num1*10-7; else if(zhenghao) num2=num2*10+7; else num2=num2*10-7; void Calculator:button_8_clicked() S+=&

22、quot;8" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*10+8; else num1=num1*10-8; else if(zhenghao) num2=num2*10+8; else num2=num2*10-8; void Calculator:button_9_clicked() S+="9" lineEditor->setText(S); if(mark=1) if(zhenghao) num1=num1*10+9; else num1=num1*10-9; else

23、 if(zhenghao) num2=num2*10+9; else num2=num2*10-9; void Calculator:button_jia_clicked() S+="+" lineEditor->setText(S); zhenghao=true; fuhao='+' mark=2;void Calculator:button_jian_clicked() S+="-" lineEditor->setText(S); zhenghao=true; fuhao='-' mark=2;void C

24、alculator:button_cheng_clicked() S+="*" lineEditor->setText(S); zhenghao=true; fuhao='*' mark=2;void Calculator:button_chu_clicked() S+="/" lineEditor->setText(S); zhenghao=true; fuhao='/' mark=2;void Calculator:button_clicked() S+="-" lineEditor->setText(S); zhenghao=false;void Calculator:button_dengyu_clicked() S+="