Calculator5.rar

#include "mainwindow.h" #include<QPushButton> #include<QMessageBox> #include<map> #include<stack> #include<cmath> #include<QClipboard> #include<QApplication> #include<QDebug> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ui->lineEdit->setText("0"); waitForOperand=true; connectSlots(); setShortcutKeys(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::abortOperation() { ui->lineEdit->setText("0"); waitForOperand=true; QMessageBox::warning(this,"运算错误","错误！"); } void MainWindow::connectSlots() { QPushButton *digitaBtns[10]={ ui->digtalBtn0,ui->digtalBtn1,ui->digtalBtn2,ui->digtalBtn3,ui->digtalBtn4,ui->digtalBtn5,ui->digtalBtn6,ui->digtalBtn7,ui->digtalBtn8,ui->digtalBtn9 }; for(auto btn:digitaBtns) connect(btn,&QPushButton::clicked,this,&MainWindow::digitClicked); QPushButton *operatorBtns[8]={ ui->addBtn,ui->subtractionBtn,ui->mulBtn,ui->divBtn,ui->leftBracketBtn,ui->rightBracketBtn,ui->powBtn,ui->percrntBtn }; 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::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->digtalBtn0,ui->digtalBtn1,ui->digtalBtn2,ui->digtalBtn3,ui->digtalBtn4,ui->digtalBtn5,ui->digtalBtn6,ui->digtalBtn7,ui->digtalBtn8,ui->digtalBtn9, ui->addBtn,ui->subtractionBtn,ui->mulBtn,ui->divBtn,ui->equalBtn,ui->pointBtn,ui->clearAllBtn,ui->signBtn,ui->leftBracketBtn,ui->rightBracketBtn,ui->powBtn, ui->percrntBtn,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")); } void MainWindow::digitClicked() { QPushButton *digitBtn=static_cast<QPushButton*>(sender()); QString value=digitBtn->text(); if(ui->lineEdit->text()=="0"&&value=="0") return; if(waitForOperand) { ui->lineEdit->setText(value); waitForOperand=false; } else { ui->lineEdit->setText(ui->lineEdit->text()+value); } } void MainWindow::operatorClicked() { QPushButton *clickedBtn=qobject_cast<QPushButton*>(sender()); QString clickedOperator=clickedBtn->text(); if(waitForOperand==true&&clickedOperator=='(')//首符号为‘（’的到时候 { ui->lineEdit->setText(clickedOperator); waitForOperand=false; } else if(waitForOperand==false) ui->lineEdit->setText(ui->lineEdit->text()+clickedOperator); //以上更具有鲁棒性 // if(waitForOperand==false&&ui->lineEdit->text().data()[ui->lineEdit->text().size()-1].isDigit()==true)//在 waitforoperand允许的情况下，并且字符串最后一个字符为数字的情况下 // ui->lineEdit->setText(ui->lineEdit->text()+clickedOperator); // else if(waitForOperand==false&&clickedOperator=='(') // ui->lineEdit->setText(ui->lineEdit->text()+clickedOperator); // else if(waitForOperand==false&&ui->lineEdit->text().data()[ui->lineEdit->text().size()-1]=='%') // ui->lineEdit->setText(ui->lineEdit->text()+clickedOperator); // else if(waitForOperand==true&&clickedOperator=='(')//首符号为‘（’的到时候 // { // ui->lineEdit->setText(clickedOperator); // waitForOperand=false; // } } void MainWindow::specialOperatorClicked() { QPushButton *specialOperatorBtn=static_cast<QPushButton*>(sender()); QString value=specialOperatorBtn->text(); if(waitForOperand) { ui->lineEdit->setText(value); waitForOperand=false; } else { ui->lineEdit->setText(ui->lineEdit->text()+value); } } void MainWindow::on_equalBtn_clicked() { double result=0.0; try { result=compute(inToPost(ui->lineEdit->text())); // QMessageBox::warning(this,"提示",inToPost(ui->lineEdit->text()));//查看后缀表达式 } catch(const char *er) { error=er; abortOperation(); return; } ui->lineEdit->setText(ui->lineEdit->text()+'='+QString::number(result)); log=ui->lineEdit->text(); waitForOperand=true; } void MainWindow::on_clearBtn_clicked() { //将显示字符串退格 QString str=ui->lineEdit->text(); if(str!='0'&&waitForOperand==false) { ui->lineEdit->setText(str.left(str.count()-1)); waitForOperand=false; } else { ui->lineEdit->setText("0"); waitForOperand=true; } } void MainWindow::on_clearAllBtn_clicked() { //将当前显示全部归零 ui->lineEdit->setText("0"); waitForOperand=true; } void MainWindow::on_signBtn_clicked() { QString text=ui->lineEdit->text(); QChar sign=text[text.size()-1]; if(sign=='-') { text.remove(text.size()-1,1); } else { text.append('-'); } ui->lineEdit->setText(text); } void MainWindow::on_pointBtn_clicked() { if(waitForOperand==false&&ui->lineEdit->text().data()[ui->lineEdit->text().size()-1].isDigit()==true) ui->lineEdit->setText(ui->lineEdit->text()+"."); } QString MainWindow::inToPost(QString infix) throw(const char*)//将中缀表达式转换为后缀表达式 { std::stack<char> stack; char current=0; QString postfix; std::map<char,int> priority; 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; for(int i=0;i<infix.length();i++) { current=infix[i].toLatin1(); if(isdigit(current)) { postfix.push_back(current); continue; } switch (current) { case '+': case '-': case '*': case '/': case '^': if(infix[i-1]!=')') { if(infix[i-1].isDigit()) postfix.push_back('#'); else if(infix[i-1]=='%') {} // infix.begin(); else throw "expression is illegality"; } if(stack.empty()==false) { 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); break; case's': case'c': case't': if(i>0&&infix[i-1].isDigit()) throw"表达式非法"; if(!stack.empty()) { char temTop=stack.top(); while(temTop!='('&&priority[current]<priority[temTop])