Qt课题之科学计算器

来源：纷纭教育

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QT课程作业设计

题目：科学计算器

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小组成员：陈启敬 201113010409 刘阳 201113010405 何亚洲 201113010407 王勇 201113010404

黄昭宇 201113010421

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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。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：

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动作编辑器的设置：

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信号槽设置：

设计出的界面如下：

标准型：

科学型：

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实现版权信息：

界面的相关代码：

#ifndef MAINWINDOW_H #define MAINWINDOW_H #include

namespace Ui {

class MainWindow; }

class MainWindow : public QMainWindow {

Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);

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~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_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 on_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_btnSqrt_clicked();//开方

void on_btnPercent_clicked();//百分号

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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

void 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X^2 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x^y void on_btnX___y_clicked();//按键x√y void on_btnTanh_clicked();//按键tanh void on_btnTan_clicked();//按键tan void on_btnX_3_clicked();//按键x^3 void on_btnX___3_clicked();//按键3√x 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10^x void on_btnLkuo_clicked();//按键 ( 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__y

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QString 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 factorSoFar;//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_H

2．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 \"mainwindow.h\"

#include \"ui_mainwindow.h\" #include \"QMessageBox\" #include //#define exp=2.71828 //#define pi=3.14159

MainWindow::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()->setSizeConstraint(QLayout::SetFixedSize);

sumInMemory = 0.0;//变量初始化 sumSoFar = 0.0; factorSoFar = 0.0;

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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::AlignRight);//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(A)\"), tr(\"版本号： v1.0.0.0

\"开发者： 陈启敬 201113010409

\" \"

刘阳 201113010405

\" \"

何亚洲 201113010407

\" \"

王勇 201113010404

\" \"

黄昭宇 201113010421

\")); }

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();

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QString A=ui->lineEdit->text();

if (!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;

pendingMultiplicativeOperator.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\")

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

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else ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"=\"+QString::number(sumSoFar)); }

else ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"=\"+QString::number(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()//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\"); }

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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\"); }

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(\".\")); }

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\"); }

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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*=rightOperand; }

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/SoFar); }

return true; }

void MainWindow::clickbtn1(QString btn)//按键数字 {

if(ui->lineEdit->text() == \"0\")

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{

ui->lineEdit->setText(btn); }

else if(!pendingOperator1.isEmpty()) {

if(F!=\"0\") {

ui->lineEdit->setText(btn); F = \"0\"; }

else ui->lineEdit->setText(ui->lineEdit->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(btn); 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\";

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} } }

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 operand = 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\")) {

result=3.14159;

}

else if(btn==tr(\"exp\")) {

result=2.71828; }

else if(btn==tr(\"x_2\")) {

result=pow(operand, 2.0);

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}

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(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(operand<0.0) {

abortOperation();

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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(\"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\"))

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{

double a=operand/57.1158; result=cos(a);

QString str = QString::number(result,'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 MainWindow::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(); if (!pendingOperator1.isEmpty()) {

calculate(operand,pendingOperator1); operand = SoFar;

ui->lineEdit->setText(QString::number(SoFar)); SoFar = 0.0;

//pendingOperator1.clear(); }

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if (!pendingMultiplicativeOperator.isEmpty())

{

if (!calculate(operand, pendingMultiplicativeOperator)) {

abortOperation(); return; }

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, 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.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString::number(A)+clickedOperator); } else {

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if(K!=\"0\")

{

ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString::number(operand)+clickedOperator); }

else ui->lineEdit_2->setText(QString::number(operand)+clickedOperator); } }

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().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::number(A)+clickedOperator);

if (!calculate(operand, pendingMultiplicativeOperator)) {

abortOperation(); return; }

ui->lineEdit->setText(QString::number(factorSoFar)); } else

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{

factorSoFar = operand;

if(!pendingOperator1.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString::number(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->lineEdit_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));

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QString M=QString::number(sumInMemory);

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->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(\"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- {

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\") {

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ui->lineEdit_2->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->lineEdit->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()//按键正负 {

QString operand = ui->lineEdit->text();

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double value = operand.toDouble();

if (value > 0.0) {

operand .prepend(tr(\"-\")); }

else if (value < 0.0) {

operand.remove(0, 1); }

ui->lineEdit->setText(operand); }

void MainWindow::on_btnSqrt_clicked()//按键开方

{

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"√(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"√(\"+A+\")\"); clickbtn2(\"Sqrt\"); }

void MainWindow::on_btnPercent_clicked()//按键% {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+A+\"%\"); }

else ui->lineEdit_2->setText(A+\"%\"); clickbtn2(\"%\"); }

void MainWindow::on_btn_1_x_clicked()//按键1/x

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{

clickbtn2(\"1/x\"); }

void MainWindow::on_btnPi_clicked()//按键pi {

C = \"1\";

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"π\"); }

else ui->lineEdit_2->setText(\"π\"); clickbtn2(\"pi\"); }

void MainWindow::on_btnLn_clicked()//按键ln {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"ln\"+A); }

else ui->lineEdit_2->setText(\"ln\"+A); clickbtn2(\"ln\"); }

void MainWindow::on_btnSinh_clicked()//按键sinh {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"sinh(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"sinh(\"+A+\")\"); clickbtn2(\"sinh\");

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}

void MainWindow::on_btnSin_clicked()//按键sin {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"sin(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"sin(\"+A+\")\"); clickbtn2(\"sin\"); }

void MainWindow::on_btnX_2_clicked()//按键x^2 {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+A+\"^\"); }

else ui->lineEdit_2->setText(A+\"^\"+\"2\"); clickbtn2(\"x_2\"); }

void MainWindow::on_btnN_class_clicked()//按键n! {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+A+\"!\"); }

else ui->lineEdit_2->setText(A+\"!\"); clickbtn2(\"n!\"); }

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void MainWindow::on_btnCosh_clicked()//按键cosh

{

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"cosh(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"cosh(\"+A+\")\"); clickbtn2(\"cosh\"); }

void MainWindow::on_btnCos_clicked()//按键cos {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"cos(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"cos(\"+A+\")\"); clickbtn2(\"cos\"); }

void MainWindow::on_btnX_y_clicked()//按键x^y {

double operand = ui->lineEdit->text().toDouble(); if(operand<=0.0) {

abortOperation();

return; }

if(!pendingOperator1.isEmpty()) {

calculate(operand,pendingOperator1);

ui->lineEdit->setText(QString::number(SoFar)); } else

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{

SoFar=operand;

pendingOperator1 = \"x_y\"; }

if(B != \"1\") {

ui->lineEdit_2->setText(QString::number(operand)+\"^\"); }

else ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString::number(operand)+\"^\"); F = \"1\"; }

void MainWindow::on_btnX___y_clicked()//按键x开y {

double operand = ui->lineEdit->text().toDouble(); if(!pendingOperator1.isEmpty()) {

calculate(operand,pendingOperator1);

ui->lineEdit->setText(QString::number(SoFar)); } else

{

SoFar=operand;

pendingOperator1 = \"x__y\"; }

if(B != \"1\") {

ui->lineEdit_2->setText(QString::number(operand)+\"√\"); }

else ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString::number(operand)+\"√\"); F = \"1\"; }

void MainWindow::on_btnTanh_clicked()//按键tanh {

C = \"1\";

QString A = ui->lineEdit->text();

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if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"tanh(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"tanh(\"+A+\")\"); clickbtn2(\"tanh\"); }

void MainWindow::on_btnTan_clicked()//按键tan {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"tan(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"tan(\"+A+\")\"); clickbtn2(\"tan\"); }

void MainWindow::on_btnX_3_clicked()//按键x^3

{

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+A+\"^\"); }

else ui->lineEdit_2->setText(A+\"^\"+\"3\"); clickbtn2(\"x_3\"); }

void MainWindow::on_btnX___3_clicked()//按键x开3 {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

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ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"3√(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"3√(\"+A+\")\"); clickbtn2(\"x__3\"); }

void MainWindow::on_btnExp_clicked()//按键e {

C = \"1\";

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"e\"); }

else ui->lineEdit_2->setText(\"e\"); clickbtn2(\"exp\"); }

void MainWindow::on_btnMod_clicked()//按键模运算 {

double operand=ui->lineEdit->text().toDouble(),result; double a=modf(operand, &result);

ui->lineEdit->setText(QString::number(a));

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+QString::number(a)); }

else ui->lineEdit_2->setText(QString::number(a)); }

void MainWindow::on_btnLog_clicked()//按键log

{

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"log(\"+A+\")\"); }

else ui->lineEdit_2->setText(\"log(\"+A+\")\");

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clickbtn2(\"log10\"); }

void MainWindow::on_btn10_x_clicked()//按键10^x {

C = \"1\";

QString A = ui->lineEdit->text();

if(!pendingAdditiveOperator.isEmpty()||!pendingMultiplicativeOperator.isEmpty()) {

ui->lineEdit_2->setText(ui->lineEdit_2->text()+\"10^\"+A); }

else ui->lineEdit_2->setText(\"10^\"+A);

clickbtn2(\"10_x\");

三、一些简单运行的效果：

乘法：

三角函数：

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加乘混合运算：

阶乘：

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幂运算：

存储：

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心得体会，通过该作业我们获得了如何发现问题。通过问题逆向寻求根源解决问题能力。在整个作业的设计过程中，一些看似简单的问题，单独情况下可以轻易解决。单牵一发而动全身，我们必须考虑到相关涉及的各种情况。开发过程中参阅了QT助手中的计算器和一些相关的计算器项目。虽然我们的计算器不算完美，我们自我感觉还是不错。这是我们第一个作品，希望还有更多的

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因篇幅问题不能全部显示，请点此查看更多更全内容

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