Qt课题之科学计算器

1、QT作业 科学计算器QT课程作业设计题目：科学计算器小组成员：陈启敬 201113010409刘阳 201113010405何亚洲 201113010407王勇 201113010404黄昭宇 201113010421一、 功能设计要求： 特别声明：本程序系QT5编译制作科学计算器两种计算器模式：一个普通模式，一个科学模式。参照windows7 的“计算器”程序说明：在查看菜单下有两个菜单项：“标准型”、“科学型”。当用户选择标准型的时候，只有一个显示区，显示用户当前键入的数据或计算结果；当用户选择科学型的时候，有两个显示区，其中最上面有个显示用户当前键入的数据 或计算的结果，也就是标准型的显

2、示区，它的下面（MC 按钮的左边）有一个显示区用来显示当前用户临时保存在Memory 中的数据。在编辑菜单下有“复制”和“粘贴”两个菜单项，其功能与 windows的计算器一样。帮助菜单下有“关于计算器”菜单项，点击该菜单项时 弹出一个对话框，显示版权信息（包含开发者名字、学号）。功能介绍：对于计算器我们都很熟悉，在平常的生活中也经常用到。本次设计的科学计算器不但可以计算普通的加减乘除运算，还可以对于三角函数，乘方，对数等一些运算。二、 详细的设计介绍1 界面设计 界面设计我们是使用Qt creator进行设计的，首先创建QMainWindow(parent).ui，这个界面为QWidget。

3、然后在左侧的Widget Box找相应的控件添加到QMainWindow(parent)里。然后添加相应的按钮，lineEdit控件作为算式显示窗口和结果显示窗口，pushButton作为相应数字和功能按钮等，并将它们的名称属性修改。相应的属性修改： 动作编辑器的设置：信号槽设置：设计出的界面如下： 标准型： 科学型：实现版权信息： 界面的相关代码：#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>namespace Uiclass MainWindow;class MainWindow : public Q

4、MainWindow Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); MainWindow();private slots: /存储槽口 void on_btnMjian_clicked(); void on_btnMjia_clicked(); void on_btnMS_clicked(); void on_btnMR_clicked(); void on_btnMC_clicked();void about();void copy();void paste(); /标准型和科学型槽口 void on_action_S_

5、triggered(); void on_action_T_triggered(); /0-9槽函数的定义 void on_btn1_clicked(); void on_btn2_clicked(); void on_btn3_clicked(); void on_btn4_clicked(); void on_btn5_clicked(); void on_btn6_clicked(); void on_btn7_clicked(); void on_btn8_clicked(); void on_btn9_clicked(); void on_btn0_clicked(); void o

6、n_btnPoint_clicked();/点 void additiveOperatorClicked(QString);/加法器 void multiplicativeOperatorClicked(QString);/乘法器 /void kuohaoOperatorClicked(QString);/括号运算 void on_btnBackspace_clicked();/退格 void on_btnClear_clicked();/初始化 void on_btnPlus_clicked();/符号的改变 void on_btnCE_clicked();/清屏 void on_btnSq

7、rt_clicked();/开方 void on_btnPercent_clicked();/百分号 void on_btn_1_x_clicked();/ 1/x void on_btnEql_clicked();/等于 void clickbtn1(QString);/数字 void clickbtn2(QString);/一元操作运算 void on_btnAdd_clicked();/加 void on_btnSubtract_clicked();/减 void on_btnMultiply_clicked();/乘 void on_btnDivide_clicked();/除 voi

8、d on_btnPi_clicked();/按键Pi void on_btnLn_clicked();/按键Ln void on_btnSinh_clicked();/按键sinh void on_btnSin_clicked();/按键Sin void on_btnX_2_clicked();/按键X2 void on_btnN_class_clicked();/按键N! void on_btnCosh_clicked();/按键Cosh void on_btnCos_clicked();/按键Cos void on_btnX_y_clicked();/按键xy void on_btnX_y

9、_clicked();/按键xy void on_btnTanh_clicked();/按键tanh void on_btnTan_clicked();/按键tan void on_btnX_3_clicked();/按键x3 void on_btnX_3_clicked();/按键3x void on_btnExp_clicked();/按键e void on_btnMod_clicked();/按键mod void on_btnLog_clicked();/按键log void on_btn10_x_clicked();/按键10x void on_btnLkuo_clicked();/按

10、键 ( void on_btnRkuo_clicked();/按键 )private: Ui:MainWindow *ui; QString B;/标记等号状态 QString C;/标记一元操作状态 QString D;/标记add运算符状态 QString E;/标记mul运算符状态 QString F;/标记x_y,x_yQString K;/标记括号状态QString M; /QString G;/标记x_y void abortOperation();/错误判断 double sumInMemory;/记忆存储 double sumSoFar;/加 double factorSoFa

11、r;/乘 double SoFar;/幂 double kuohao;/括号 QString pendingAdditiveOperator; QString pendingMultiplicativeOperator; QString pendingOperator1; QString kuoOperator;/括号操作 bool calculate(double rightOperand, const QString &pendingOperator);#endif / MAINWINDOW_H2 计算功能的设计2.1关于计算机的初始化和相关版本的代码：#include "

12、;mainwindow.h"#include "ui_mainwindow.h"#include "QMessageBox"#include <math.h>/#define exp=2.71828/#define pi=3.14159MainWindow:MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui:MainWindow) ui->setupUi(this); ui->groupBox->hide();/科学计算框默认隐藏 layout(

13、)->setSizeConstraint(QLayout:SetFixedSize); sumInMemory = 0.0;/变量初始化 sumSoFar = 0.0; factorSoFar = 0.0; SoFar=0.0; B="0" C="0" K="0" ui->lineEdit->setText("0"); ui->lineEdit->setReadOnly(true);/将文本编辑框设置为不可更改 ui->lineEdit->setAlignment(Qt:A

14、lignRight);/设置成右对齐 ui->lineEdit_2->setReadOnly(true);/将文本编辑框设置为不可更改 QFont font = ui->lineEdit->font();/设置字体 font.setPointSize(font.pointSize() + 6); ui->lineEdit->setFont(font);MainWindow:MainWindow() delete ui;void MainWindow:about()/关于计算器(A) QMessageBox:about(this, tr("关于计算器

15、(A)"), tr("<b>版本号：</b> v1.0.0.0<li>" "<b>开发者：</b> 陈启敬 201113010409<li>" "<div align=right>刘阳 201113010405</div>" "<div align=right>何亚洲 201113010407</div>" "<div align=right>王勇 20111301

16、0404</div>" "<div align=right>黄昭宇 201113010421</div>");2.2.数字按键、等号等按钮代码： void MainWindow:on_btnEql_clicked()/按键=号 if (!ui->lineEdit_2->text().contains("=") double operand = ui->lineEdit->text().toDouble(); QString A=ui->lineEdit->text(); i

17、f (!pendingOperator1.isEmpty() calculate(operand,pendingOperator1); operand = SoFar; SoFar = 0.0; pendingOperator1.clear(); if (!pendingMultiplicativeOperator.isEmpty() if (!calculate(operand, pendingMultiplicativeOperator) abortOperation(); return; operand = factorSoFar; factorSoFar = 0.0; pendingM

18、ultiplicativeOperator.clear(); if (!pendingAdditiveOperator.isEmpty() if (!calculate(operand, pendingAdditiveOperator) abortOperation(); return; pendingAdditiveOperator.clear(); else sumSoFar = operand; ui->lineEdit->setText(QString:number(sumSoFar); if(K !="1") if(C != "1"

19、) ui->lineEdit_2->setText(ui->lineEdit_2->text()+A+"="+QString:number(sumSoFar); else ui->lineEdit_2->setText(ui->lineEdit_2->text()+"="+QString:number(sumSoFar); else ui->lineEdit_2->setText(ui->lineEdit_2->text()+"="+QString:number(

20、sumSoFar); sumSoFar = 0.0; B="1" C="0" /0-9槽函数void MainWindow:on_btn0_clicked()/0号键的槽函数 clickbtn1("0");void MainWindow:on_btn1_clicked()/1号键的槽函数 clickbtn1("1");void MainWindow:on_btn2_clicked()/2号键的槽函数 clickbtn1("2");void MainWindow:on_btn3_clicked()

21、/3号键的槽函数 clickbtn1("3");void MainWindow:on_btn4_clicked()/4号键的槽函数 clickbtn1("4");void MainWindow:on_btn5_clicked()/5号键的槽函数 clickbtn1("5");void MainWindow:on_btn6_clicked()/6号键的槽函数 clickbtn1("6");void MainWindow:on_btn7_clicked()/7号键的槽函数 clickbtn1("7"

22、);void MainWindow:on_btn8_clicked()/8号键的槽函数 clickbtn1("8");void MainWindow:on_btn9_clicked()/9号键的槽函数 clickbtn1("9");void MainWindow:on_btnPoint_clicked()/Point键的槽函数 if (!ui->lineEdit->text().contains(".") ui->lineEdit->setText(ui->lineEdit->text() + tr

23、(".");void MainWindow:on_btnBackspace_clicked()/backspace槽函数的定义 QString operand = ui->lineEdit->text(); operand.chop(1); if (operand.isEmpty() operand = "0" ui->lineEdit->setText(operand);void MainWindow:on_btnCE_clicked()/按键CE=清楚屏幕 ui->lineEdit->setText("0

24、");2.3.计算槽的相关代码：bool MainWindow:calculate(double rightOperand, const QString &pendingOperator)/计算槽，栈 if(pendingOperator=tr("+") sumSoFar+=rightOperand; else if(pendingOperator=tr("-") sumSoFar-=rightOperand; else if(pendingOperator=tr("*") factorSoFar*=rightOpe

25、rand; else if(pendingOperator=tr("/") if (rightOperand=0.0) return false; factorSoFar /= rightOperand; else if(pendingOperator=tr("x_y") SoFar=pow(SoFar,rightOperand); else if(pendingOperator=tr("x_y") if(rightOperand<=0.0) return false; SoFar=pow(rightOperand,1.0/So

26、Far); return true;void MainWindow:clickbtn1(QString btn)/按键数字 if(ui->lineEdit->text() = "0") ui->lineEdit->setText(btn); else if(!pendingOperator1.isEmpty() if(F!="0") ui->lineEdit->setText(btn); F = "0" else ui->lineEdit->setText(ui->lineEdit

27、->text()+btn); else if(!pendingMultiplicativeOperator.isEmpty() if(D!="0") ui->lineEdit->setText(btn); D = "0" else ui->lineEdit->setText(ui->lineEdit->text()+btn); else if(!pendingAdditiveOperator.isEmpty() if(E!="0") ui->lineEdit->setText(bt

28、n); E = "0" else ui->lineEdit->setText(ui->lineEdit->text()+btn); else if(B!="1") ui->lineEdit->setText(ui->lineEdit->text()+btn); else ui->lineEdit->setText(btn); B="0" 2.4.一元操作运算的相关代码：void MainWindow:clickbtn2(QString btn)/一元操作运算 double o

29、perand = ui->lineEdit->text().toDouble(); double result = 0.0; if(btn=tr("Sqrt") if(operand<0.0) abortOperation(); return; result=sqrt(operand); else if(btn=tr("x_3") if(operand<0.0) abortOperation(); return; result=pow(operand,1.0/3.0); else if(btn=tr("pi")

30、 result=3.14159; else if(btn=tr("exp") result=2.71828; else if(btn=tr("x_2") result=pow(operand, 2.0); else if(btn=tr("10_x") result=pow(10.0, operand); else if(btn=tr("x_3") result=pow(operand, 3.0); else if(btn=tr("%") result=operand/100.0; else if

31、(btn=tr("1/x") if(operand=0.0) abortOperation(); return; result=1.0/operand; else if(btn=tr("ln") if(operand<0.0) abortOperation(); return; result=log(operand); QString str = QString:number(result,'f',4); result=str.toDouble(); else if(btn=tr("log10") if(oper

32、and<0.0) abortOperation(); return; result=log10(operand); else if(btn=tr("n!") int i,j=1; if(operand>0.0) for(i=2;i<=operand;i+) j*=i; result=j; else if(operand<0.0) abortOperation(); return; else result=1; else if(btn=tr("sinh") result=sinh(operand); else if(btn=tr(&

33、quot;sin") double a=operand/57.1158; result=sin(a); QString str = QString:number(result,'f',2); result=str.toDouble(); else if(btn=tr("cosh") result=cosh(operand); else if(btn=tr("cos") double a=operand/57.1158; result=cos(a); QString str = QString:number(result,'

34、;f',2); result=str.toDouble(); else if(btn=tr("tanh") result=tanh(operand); else if(btn=tr("tan") double a=operand/57.1158; result=tan(a); QString str = QString:number(result,'f',2); result=str.toDouble(); ui->lineEdit->setText(QString:number(result);void MainWi

35、ndow:abortOperation()/abortOperation的定义 on_btnClear_clicked(); ui->lineEdit->setText(tr("Error");2.5.计算器运算实现代码：void MainWindow:additiveOperatorClicked(QString clickedOperator)/加法器 double operand = ui->lineEdit->text().toDouble(); double A = ui->lineEdit->text().toDouble()

36、; if (!pendingOperator1.isEmpty() calculate(operand,pendingOperator1); operand = SoFar; ui->lineEdit->setText(QString:number(SoFar); SoFar = 0.0; /pendingOperator1.clear(); if (!pendingMultiplicativeOperator.isEmpty() if (!calculate(operand, pendingMultiplicativeOperator) abortOperation(); ret

37、urn; ui->lineEdit->setText(QString:number(factorSoFar); operand = factorSoFar; factorSoFar = 0.0; /pendingMultiplicativeOperator.clear(); if (!pendingAdditiveOperator.isEmpty() ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString:number(A)+clickedOperator); if (!calculate(operand

38、, pendingAdditiveOperator) abortOperation(); return; ui->lineEdit->setText(QString:number(sumSoFar); else sumSoFar = operand; if(!pendingOperator1.isEmpty() ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString:number(A)+clickedOperator); else if(!pendingMultiplicativeOperator.isE

39、mpty() ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString:number(A)+clickedOperator); else if(K!="0") ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString:number(operand)+clickedOperator); else ui->lineEdit_2->setText(QString:number(operand)+clickedOpera

40、tor); pendingMultiplicativeOperator.clear(); pendingOperator1.clear(); E = "1" pendingAdditiveOperator = clickedOperator;void MainWindow:multiplicativeOperatorClicked(QString clickedOperator)/乘法器 double operand = ui->lineEdit->text().toDouble(); double A = ui->lineEdit->text().

41、toDouble(); if (!pendingOperator1.isEmpty() calculate(operand,pendingOperator1); operand = SoFar; ui->lineEdit->setText(QString:number(SoFar); SoFar = 0.0; /pendingOperator1.clear(); if (!pendingMultiplicativeOperator.isEmpty() ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString

42、:number(A)+clickedOperator); if (!calculate(operand, pendingMultiplicativeOperator) abortOperation(); return; ui->lineEdit->setText(QString:number(factorSoFar); else factorSoFar = operand; if(!pendingOperator1.isEmpty() ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString:number(

43、A)+clickedOperator); else if(!pendingAdditiveOperator.isEmpty() ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString:number(A)+clickedOperator); else if(K!="0") ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString:number(operand)+clickedOperator); else ui->li

44、neEdit_2->setText(QString:number(operand)+clickedOperator); pendingOperator1.clear(); pendingMultiplicativeOperator = clickedOperator; D = "1"/MC，MR，MS，M+，M-槽的定义void MainWindow:on_btnMC_clicked()/按键MC=memory clear sumInMemory = 0.0; ui->lineEdit_2->setText("M=0");/edit_2

45、显示存储中的数据 ui->lineEdit->setText("0");void MainWindow:on_btnMR_clicked()/按键MR=memory read C = "1" ui->lineEdit->setText(QString:number(sumInMemory); QString M=QString:number(sumInMemory); if(!pendingAdditiveOperator.isEmpty()|!pendingMultiplicativeOperator.isEmpty() ui-

46、>lineEdit_2->setText(ui->lineEdit_2->text()+M); else ui->lineEdit_2->setText("M="+QString:number(sumInMemory);void MainWindow:on_btnMS_clicked()/按键MS=memory save on_btnEql_clicked(); sumInMemory = ui->lineEdit->text().toDouble(); ui->lineEdit_2->setText("

47、M="+QString:number(sumInMemory);/edit_2显示存储中的数据void MainWindow:on_btnMjia_clicked()/按键M+ on_btnEql_clicked(); sumInMemory += ui->lineEdit->text().toDouble(); ui->lineEdit_2->setText("M="+QString:number(sumInMemory);/edit_2显示存储中的数据void MainWindow:on_btnMjian_clicked()/按键M-

48、on_btnEql_clicked(); sumInMemory-=ui->lineEdit->text().toDouble(); ui->lineEdit_2->setText("M="+QString:number(sumInMemory);/edit_2显示存储中的数据void MainWindow:on_btnAdd_clicked()/+号键 additiveOperatorClicked("+"); C = "0" if(B != "0") ui->lineEdit_2-

49、>setText(ui->lineEdit->text()+"+"); void MainWindow:on_btnSubtract_clicked()/-号键 additiveOperatorClicked("-"); C = "0" if(B != "0") ui->lineEdit_2->setText(ui->lineEdit->text()+"-"); /else ui->lineEdit_2->setText(ui->lin

50、eEdit->text()+"-");void MainWindow:on_btnMultiply_clicked()/*号键 multiplicativeOperatorClicked("*"); C = "0" if(B != "0") ui->lineEdit_2->setText(ui->lineEdit->text()+"*"); void MainWindow:on_btnDivide_clicked()/号键 multiplicativeOperatorClicked("/"); C = "0" if(B != "0") ui->lineEdit_2->setText(ui->lineEdit->text()+"/"); void MainWindow:on_btnPlus_clicked()/按键