Qt计算器.docx

1、Qt计算器 Linux界面设计Qt简单计算器课程名称：计算机基础综合 课题分类：Qt界面设计 班 级：11计算机科学与技术2班姓 名：段秉芮 学 号：1145532211 完成时间：2014年01月01Qt计算器一.摘要当今社会是信息社会，科技经济高速发展的社会，为了更方便人们的工作生活和加速人们处理信息的速度，计算器应运而生。然而，电脑已经成为当代人生活的必需品，运行在电脑上的计算器成为了人们的生活学习绝佳伴侣。本设计是用C+编写的，基于Qt图形用户界面应用程序框架的计算器。设计出两个电脑端和安卓手机端两个应用程序，并实现了一定的计算功能。二建立项目如下所示： 首先在linux下softce

2、nter安装Qt Creator 或者在terminal中输入命令安装； sudo apt-get install libqt4-dev libqt4-debug libqt4-gui libqt4-sql qt4-dev-tools qt4-doc qt4-designer qt4-qtconfig比如qt4-dev-tools 包含了Qt Assistant及Qt Linguist等工具，因此不需要单独安装这两个工具。其它的，qt4-doc 是帮助文档，包含了Qt中各个类库的详细说明以及丰富的例子程序，可以使用Qt Assistant 工具来打开阅读。qt4-qtconfig 是配置Qt环

3、境的一个对话框，一般默认就行了，很少有必要去更改。qt4-demos 包含很多可以运行起来的可执行文件以及源代码。qt4-designer是用来设计GUI界面的设计器 sudo apt-get install libqt4-debug /sudo apt-get install libqt4-dbg安装完成打开。1.创建工程选择File-NewFileorProject，然后如下所示，之后next。之后在Details时候，选项Base class选中QWidget。然后next至finish。二程序代码如下：1.建立calculator.h右键calculator项目，选择add new。如

4、下所示：calculator.h代码修改如下：#ifndef CALCULATOR_H#define CALCULATOR_H#include#include#include#includeclass Calculator : public QWidget Q_OBJECTpublic: Calculator(QWidget *parent = 0); Calculator();private: QTextEdit* screenTextEdit; QPushButton* button1; QPushButton* button2; QPushButton* button3; QPushBu

5、tton* button4; QPushButton* button5; QPushButton* button6; QPushButton* button7; QPushButton* button8; QPushButton* button9; QPushButton* button0; QPushButton* buttonx; QPushButton* buttondivide; QPushButton* buttonadd; QPushButton* buttonsub; QPushButton* buttondot; QPushButton* buttonequal; QPushB

6、utton* buttonclear; QPushButton* buttonback; QPushButton* buttonLArc; QPushButton* buttonRArc; bool isEnter; double sum ; int i; int j; double result; bool isPoint; bool isLArc; char sign; bool isTwoOptrsFlag; bool isEqualClicked; int f17; int f27; QVectorvectorOpnd; QVectorvectorOptr; QVectorvector

7、Exp; bool isTwoOptr(QPushButton *button); void initConnect(); void initVector(); double operate(double a, char theat, double b); char precedeSign(char optr1, char optr2); int char2num(char optr); void initData(); char button2char(QPushButton *button); void getDigital(char digital); void getSign(char

8、 ch); bool pickSign(char ch); bool pushVector(char optr); void getResult();private slots: void getButton(); void clearScreen(); void myBackSpace();#endif / CALCULATOR_H2.main.cpp修改如下： 只需要将Widget w;w.show(); 修改为Calculator cal; cal.show(); 3.calculator.cpp 建立calculator.cpp文件的过程和建立calculator.h的过程一样，只是选

9、择C+ Source File选项。 calculator.cpp代码如下：#include calculator.h#includeCalculator:Calculator(QWidget *parent) : QWidget(parent) initData(); setWindowTitle(计算器); setWindowIcon(QIcon(:/calculator.png); screenTextEdit = new QTextEdit; screenTextEdit-setFixedHeight(50); screenTextEdit-setFont(QFont(Courier

10、10 Pitch, 18, QFont:Bold); screenTextEdit-setReadOnly(true); button1 = new QPushButton(1); button2 = new QPushButton(2); button3 = new QPushButton(3); button4 = new QPushButton(4); button5 = new QPushButton(5); button6 = new QPushButton(6); button7 = new QPushButton(7); button8 = new QPushButton(8);

11、 button9 = new QPushButton(9); button0 = new QPushButton(0); buttonx = new QPushButton(); buttonadd = new QPushButton(+); buttonsub = new QPushButton(-); buttonback = new QPushButton(back); buttondivide = new QPushButton(/); buttondot = new QPushButton(.); buttonLArc = new QPushButton(); buttonRArc

12、= new QPushButton(); buttonequal = new QPushButton(=); buttonclear = new QPushButton(clear); initConnect(); QGridLayout *gridLayout = new QGridLayout; gridLayout-addWidget(screenTextEdit, 0, 0, 2, 5); gridLayout-addWidget(button1, 2, 0, 1, 1); gridLayout-addWidget(button2, 2, 1, 1 ,1); gridLayout-ad

13、dWidget(button3, 2, 2, 1, 1); gridLayout-addWidget(buttonadd, 2, 3, 1, 1); gridLayout-addWidget(buttonsub, 2, 4, 1, 1); gridLayout-addWidget(button4, 3, 0, 1, 1); gridLayout-addWidget(button5, 3, 1, 1, 1); gridLayout-addWidget(button6, 3, 2, 1, 1); gridLayout-addWidget(buttonx, 3, 3, 1, 1); gridLayo

14、ut-addWidget(buttondivide, 3, 4, 1, 1); gridLayout-addWidget(button7, 4, 0, 1, 1); gridLayout-addWidget(button8, 4, 1, 1, 1); gridLayout-addWidget(button9, 4, 2, 1, 1); gridLayout-addWidget(buttonLArc, 4, 3, 1, 1); gridLayout-addWidget(buttonRArc, 4, 4, 1, 1); gridLayout-addWidget(button0, 5, 0, 1,

15、1); gridLayout-addWidget(buttondot, 5, 1, 1, 1); gridLayout-addWidget(buttonback, 5, 2, 1, 1); gridLayout-addWidget(buttonclear, 5, 3, 1, 1); gridLayout-addWidget(buttonequal, 5, 4, 1, 1); setLayout(gridLayout); initVector();void Calculator:initConnect() connect(button0, &QPushButton:clicked, this,

16、&Calculator:getButton); connect(button1, &QPushButton:clicked, this, &Calculator:getButton); connect(button2, &QPushButton:clicked, this, &Calculator:getButton); connect(button3, &QPushButton:clicked, this, &Calculator:getButton); connect(button4, &QPushButton:clicked, this, &Calculator:getButton);

17、connect(button5, &QPushButton:clicked, this, &Calculator:getButton); connect(button6, &QPushButton:clicked, this, &Calculator:getButton); connect(button7, &QPushButton:clicked, this, &Calculator:getButton); connect(button8, &QPushButton:clicked, this, &Calculator:getButton); connect(button9, &QPushB

18、utton:clicked, this, &Calculator:getButton); connect(buttonx, &QPushButton:clicked, this, &Calculator:getButton); connect(buttonadd, &QPushButton:clicked, this, &Calculator:getButton); connect(buttondivide, &QPushButton:clicked, this, &Calculator:getButton); connect(buttondot, &QPushButton:clicked,

19、this, &Calculator:getButton); connect(buttonsub, &QPushButton:clicked, this, &Calculator:getButton); connect(buttonRArc, &QPushButton:clicked, this, &Calculator:getButton); connect(buttonLArc, &QPushButton:clicked, this, &Calculator:getButton); connect(buttonback, &QPushButton:clicked, this, &Calcul

20、ator:myBackSpace); connect(buttonclear, &QPushButton:clicked, this, &Calculator:clearScreen); connect(buttonequal, &QPushButton:clicked, this, &Calculator:getButton);bool Calculator:isTwoOptr(QPushButton *button) if(button = buttonadd | button =buttonsub | button = buttonx | button = buttondivide) r

21、eturn true; else return false;void Calculator:myBackSpace() QTextCursor cursor = screenTextEdit-textCursor(); cursor.deletePreviousChar(); if(!isEqualClicked) vectorExp.pop_back();void Calculator:getButton() QPushButton* button = qobject_cast(sender(); if(isTwoOptrsFlag & isTwoOptr(button) else vect

22、orExp.append(button2char(button); isEqualClicked = false; isTwoOptrsFlag = false; if(!isEnter) screenTextEdit-append(); screenTextEdit-insertPlainText(button-text(); isEnter = true; if(button = buttonadd | button = buttonsub | button = buttonx | button = buttondivide) isTwoOptrsFlag = true; if(butto

23、n = buttonequal) isEqualClicked = true; getResult(); void Calculator:getResult() while(!vectorExp.isEmpty() char ch = vectorExp.first(); vectorExp.removeFirst(); getDigital(ch); getSign(ch); void Calculator:getDigital(char digital) if(digital = 0 | digital = 1 | digital = 2 | digital = 3 | digital =

24、 4 | digital = 5 | digital = 6 | digital = 7 | digital = 8 | digital = 9 ) if(isPoint) i *= 10; j = 0; sum = sum * 10 + (digital - 0); isLArc = false; else if(digital = .) isPoint = true; isLArc = false; void Calculator:getSign(char ch) if(isLArc & ch != ( & ch != ) sign = ch; else if(ch = + | ch =

25、- | ch = * | ch = / | ch = = | ch = ( | ch = ) if(ch = () isLArc = true; else isLArc = false; j+; if(j insertPlainText(QString(%1).arg(result); vectorOpnd.clear(); vectorOptr.clear(); initVector(); isEnter = false; return true; pushVector(ch); return true;bool Calculator:pushVector(char optr) char t

26、heta; double a, b; if(optr = ) do theta = vectorOptr.last(); vectorOptr.pop_back(); while(theta = ( | theta = ); if(theta != #)/ void 8(,9),8() b = vectorOpnd.last();vectorOpnd.pop_back(); a = vectorOpnd.last();vectorOpnd.pop_back(); vectorOpnd.append(operate(a, theta, b); else vectorOptr.append(#); return true; switch(precedeSign(vectorOptr.last(),optr) case : theta = vectorOptr.last(); vectorOptr.pop_back(); b = vectorOpnd.last(); vectorOpnd.pop_back(); a = vectorOpnd.last(); vectorOpnd.pop_back(); vectorOpnd.append(operate(a, theta, b); vectorOptr.append(optr); break; return true;vo