软件开发+QT编程+实现科学计算器计算

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QMessageBox> #include <map> #include <stack> #include <cmath> #include <QClipboard> #include <QTextBlock> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); waitForOperator = false; on_action_3_triggered(false); connectSlots(); setShortcutKeys(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::abortOperation() { setCurrentText("0"); waitForOperator = true; statusBar()->showMessage(error,4000); } void MainWindow::specialOperatorClicked() { QPushButton *specialOperatorBtn = static_cast<QPushButton*>(sender()); QString value = specialOperatorBtn->text(); QString current = currentText(); if(waitForOperator) { log.append(current + '\n'); ui->textEdit->append(value); waitForOperator = false; } else { if(current != "0") setCurrentText(current + value); else setCurrentText(value); } } void MainWindow::connectSlots() { QPushButton * digitBtns[10] = { ui->digitBtn0, ui->digitBtn1, ui->digitBtn2, ui->digitBtn3, ui->digitBtn4, ui->digitBtn5, ui->digitBtn6, ui->digitBtn7, ui->digitBtn8, ui->digitBtn9 }; for (auto btn : digitBtns) connect(btn,&QPushButton::clicked,this,&MainWindow::digitClicked); QPushButton *operatorBtns[8] = { ui->addBtn,ui->subtractionBtn,ui->multiplicationBtn,ui->divisionBtn, ui->leftBracketBtn,ui->rightBracketBtn,ui->powBtn,ui->percentBtn }; for (auto btn : operatorBtns) connect(btn,&QPushButton::clicked,this,&MainWindow::operatorClicked); QPushButton *specialOperatorBtns[5] = { ui->sinBtn,ui->cosBtn,ui->tanBtn,ui->lnBtn,ui->lgBtn }; for (auto btn : specialOperatorBtns) connect(btn,&QPushButton::clicked,this,&MainWindow::specialOperatorClicked); } void MainWindow::digitClicked() { QPushButton *digiBtn = static_cast<QPushButton*>(sender()); QString value = digiBtn->text(); QString current = currentText(); if(current =="0" && value=="0") return; if(waitForOperator) { log.append(current + '\n'); ui->textEdit->append(value); waitForOperator = false; } else { if(current != "0") setCurrentText(current +value); else setCurrentText(value); } } void MainWindow::on_clearBtn_clicked() { ui->textEdit->setText("0"); waitForOperator = true; } void MainWindow::on_clearAllBtn_clicked() { ui->textEdit->setText("0"); waitForOperator = true; } void MainWindow::on_equalBtn_clicked() { double result = 0.0; try { result = compute(inToPost(currentText())); } catch(const char *er) { error = er; abortOperation(); return; } log.append(currentText() + '\n'); ui->textEdit->append(QString::number(result)); waitForOperator = true; } void MainWindow::on_signBtn_clicked() { QString text = currentText(); QChar sign = text[text.size() - 1]; if(sign == '-') { text.remove(text.size() - 1,1); } else { text.append('-'); } setCurrentText(text); } void MainWindow::operatorClicked() { QPushButton *clickedBtn = qobject_cast<QPushButton *>(sender()); QString clickedOperator = clickedBtn->text(); setCurrentText(currentText() + clickedOperator); waitForOperator = false; } void MainWindow::on_pointBtn_clicked() { if(waitForOperator) setCurrentText("0"); setCurrentText(currentText() + "."); waitForOperator = false; } void MainWindow::setShortcutKeys() { Qt::Key key[27] = { Qt::Key_0, Qt::Key_1, Qt::Key_2, Qt::Key_3,Qt::Key_4, Qt::Key_5, Qt::Key_6, Qt::Key_7,Qt::Key_8,Qt::Key_9, Qt::Key_Plus, Qt::Key_Minus, Qt::Key_Asterisk, Qt::Key_Slash, Qt::Key_Enter,Qt::Key_Period,Qt::Key_Backspace,Qt::Key_M, Qt::Key_ParenLeft,Qt::Key_ParenRight,Qt::Key_AsciiCircum, Qt::Key_Percent,Qt::Key_S,Qt::Key_C,Qt::Key_T,Qt::Key_N,Qt::Key_G }; QPushButton *btn[27] = { ui->digitBtn0,ui->digitBtn1,ui->digitBtn2,ui->digitBtn3,ui->digitBtn4, ui->digitBtn5,ui->digitBtn6,ui->digitBtn7,ui->digitBtn8,ui->digitBtn9, ui->addBtn,ui->subtractionBtn,ui->multiplicationBtn,ui->divisionBtn, ui->equalBtn,ui->pointBtn,ui->clearBtn,ui->signBtn,ui->leftBracketBtn, ui->rightBracketBtn,ui->powBtn,ui->percentBtn,ui->sinBtn,ui->cosBtn, ui->tanBtn,ui->lnBtn,ui->lgBtn }; for(int i= 0;i<27;i++) btn[i]->setShortcut(QKeySequence(key[i])); ui->clearAllBtn->setShortcut(QKeySequence("Ctrl+Backspace")); } QString MainWindow::currentText() { QTextDocument *document = ui->textEdit->document(); QTextBlock block = document->lastBlock(); return block.text(); } void MainWindow::setCurrentText(QString text) { QString allText = ui->textEdit->toPlainText(); int pos = allText.lastIndexOf('\n'); if(pos>=0) allText.replace(allText.lastIndexOf('\n') + 1,allText.size(),text); else allText = text; ui->textEdit->setText(allText); } QString MainWindow::inToPost(QString infix) throw(const char*) { std::stack<char>stack; char current = 0;//读入的字符 QString postfix;//写入后缀表达式的字符串 std::map<char,int>priority;//运算符号优先级表 priority['+']=0; priority['-']=0; priority['*']=1; priority['/']=1; priority['^']=2; priority['s']=3; priority['c']=3; priority['t']=3; priority['n']=3; priority['g']=3; priority['%']=3; for(int i=0;i<infix.length();++i)//逐个读取中缀表达式字符串中的字符 { current = infix[i].toLatin1(); if(isdigit(current))//如果是数字直接输出 { postfix.push_back(current); continue; } switch(current) { case '+': case '-': case '*': case '/': case '^': case '%': if(infix[i-1] != ')')//如果运算符的前一项不是右括号则说明前一个数字输入完毕，用#表示前面几个字符组成一个数字 { if(infix[i-1].isDigit()) postfix.push_back('#'); else if(infix[i-1] == '%')//什么也不做，跳出 infix.begin(); else throw "表达式是非法的"; } if(!stack.empty())//比较目前符号与栈顶符号优先级，低于则出栈，并输出字符串 { char tempTop = stack.top(); while(tempTop!='('&&priority[current]<=priority[tempTop]) { stack.pop(); postfix.push_back(tempTop); if(stack.empty()) break; tempTop=stack.top(); } } stack.push(current);//符号全部出栈或者遇到了'('或者大于栈顶符号的优先级，将新符号压入栈中 break; case 's': case 'c': case 't': if(i>0 && infix[i-1].isDigit()) throw "表达式非法"; if(!stack.empty()) { char tempTop = stack.top(); while(tempTop != '('&&priority[current]<priority[tempTop]) { stack.pop(); postfix.push_back(tempTop); if(stack.empty()) break; tem