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mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <iostream>
#include <cstring>
#include <cmath>
#include <QDebug>
#include <QPainter>
#include <QStack>
#include <QQueue>

#define PI 3.1415926
#define e 2.7182818

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    //初始化
    str="";
    resultStr="";
    flag=0;
    ui->LineAnswer->setText("0");
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_Pclear_clicked()
{
    str="";
    resultStr="";
    flag=0;
    ui->LineAnswer->setText("0");
}

void MainWindow::on_P0_clicked()
{
    if(flag==0||str==""){
       ui->LineAnswer->setText("0");
       haveZero=1;
       //flag=1;
    }
    else {
        str+="0";
        ui->LineAnswer->setText(str);
    }

    //qDebug()<<str;
}

void MainWindow::on_P1_clicked()
{
    if(flag==0){
        str="1";
        flag=1;
    }
    else str+="1";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_P2_clicked()
{
    if(flag==0){
        str="2";
        flag=1;
    }
    else str+="2";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_P3_clicked()
{
    if(flag==0){
        str="3";
        flag=1;
    }
    else str+="3";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_P4_clicked()
{
    if(flag==0){
        str="4";
        flag=1;
    }
    else str+="4";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_P5_clicked()
{
    if(flag==0){
        str="5";
        flag=1;
    }
    else str+="5";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_P6_clicked()
{
    if(flag==0){
        str="6";
        flag=1;
    }
    else str+="6";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_P7_clicked()
{
    if(flag==0){
        str="7";
        flag=1;
    }
    else str+="7";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_P8_clicked()
{
    if(flag==0){
        str="8";
        flag=1;
    }
    else str+="8";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_P9_clicked()
{
    if(flag==0){
        str="9";
        flag=1;
    }
    else str+="9";
    ui->LineAnswer->setText(str);
}

//自然对数的底数e
void MainWindow::on_Pe_clicked()
{
    if(flag==0){
        str="2.7182818";
        flag=1;
    }
    else str+="2.7182818";
    ui->LineAnswer->setText(str);
}

//圆周率π
void MainWindow::on_Ppi_clicked()
{
    if(flag==0){
        str+="3.1415926";
        flag=1;
    }
    else str+="3.1415926";
    ui->LineAnswer->setText(str);
}

void MainWindow::on_Padd_clicked()
{
    if(str==""){
        str=resultStr;
        str+="+";
        ui->LineAnswer->setText(str);
    }
    if(flag==0){
         ui->LineAnswer->setText("0");
    }
    else if(str[str.size()-1]=='+'||str[str.size()-1]=='('||str[str.size()-1]=='-'||str[str.size()-1]=='*'||str[str.size()-1]=='/'||str[str.size()-1]=='^'){
        return ;
    }
    else {
        str+="+";
        ui->LineAnswer->setText(str);
    }
}

void MainWindow::on_Psub_clicked()
{
    if(str==""&&resultStr!=""){
        str=resultStr;
        str+="-";
        ui->LineAnswer->setText(str);
    }
    else if(flag==0){
        str='-';
        flag=1;
        ui->LineAnswer->setText(str);
    }
    else if(str[str.size()-1]=='+'||str[str.size()-1]=='-'||str[str.size()-1]=='*'||str[str.size()-1]=='/'||str[str.size()-1]=='^'){
        return ;
    }
    else {
        str+="-";
        ui->LineAnswer->setText(str);
    }
}

void MainWindow::on_Pmul_clicked()
{   if(str==""){
        str=resultStr;
        str+="*";
        ui->LineAnswer->setText(str);
    }
    if(flag==0){
       ui->LineAnswer->setText("0");
    }
    else if(str[str.size()-1]=='+'||str[str.size()-1]=='('||str[str.size()-1]=='-'||str[str.size()-1]=='*'||str[str.size()-1]=='/'||str[str.size()-1]=='^'){
        return ;
    }
    else {
        str+="*";
        ui->LineAnswer->setText(str);
    }
}

void MainWindow::on_Pdiv_clicked()
{
    if(str==""){
        str=resultStr;
        str+="/";
        ui->LineAnswer->setText(str);
    }
    if(flag==0){
       ui->LineAnswer->setText("0");
    }
    else if(str[str.size()-1]=='+'||str[str.size()-1]=='-'||str[str.size()-1]=='*'||str[str.size()-1]=='/'||str[str.size()-1]=='('||str[str.size()-1]=='^'){
        return ;
    }
    else{
        str+="/";
        ui->LineAnswer->setText(str);
    }

}

//乘方
void MainWindow::on_Ppower_clicked()
{
    if(str==""){
        str=resultStr;
        str+="^";
        ui->LineAnswer->setText(str);
    }
    if(flag==0){
       ui->LineAnswer->setText("0");
    }
    else if(str[str.size()-1]=='+'||str[str.size()-1]=='-'||str[str.size()-1]=='*'||str[str.size()-1]=='/'||str[str.size()-1]=='('||str[str.size()-1]=='^'){
        return ;
    }
    else{
        str+="^";
        ui->LineAnswer->setText(str);
    }
}

//左括号
void MainWindow::on_Pleft_clicked()
{
    if(str=="")
        return ;
    if(flag==0){
       ui->LineAnswer->setText("0");
    }
    //左括号前面不能为数字 小数点 右括号
    else if((str[str.size()-1]<='9') && (str[str.size()-1]>='0') || (str[str.size()-1]=='.')|| (str[str.size()-1]==')') ){
        return ;
    }
    else {
        str+="(";
        status++;
        ui->LineAnswer->setText(str);
    }
}

//右括号
void MainWindow::on_Pright_clicked()
{
    if(str=="")
        return ;
    if(flag==0){
       ui->LineAnswer->setText("0");
    }
    //前面不能为加减乘除 小数点 左括号
    else if(status==0||str[str.size()-1]=='+'||str[str.size()-1]=='-'||str[str.size()-1]=='*'||str[str.size()-1]=='/'||str[str.size()-1]=='('||str[str.size()-1]=='.'){
        return ;
    }
    else {
        str+=")";
        status--;
        ui->LineAnswer->setText(str);
    }
}

//退格
void MainWindow::on_Pbackspace_clicked()
{
    if(str!=""){
        if(str[str.size()-1]==')'){
            status++;
        }
        str.chop(1);
        ui->LineAnswer->setText(str);
    }
    if(str=="")
        ui->LineAnswer->setText("0");
}

//小数点
void MainWindow::on_Pdot_clicked()
{
    if(flag==0){
        if(haveZero==1){
            str="0.";
            ui->LineAnswer->setText(str);
            haveZero=0;
            flag=1;
            return ;
        }
       ui->LineAnswer->setText("0");
    }
    else if(str[str.size()-1]=='.'||str[str.size()-1]=='+'||str[str.size()-1]=='-'||str[str.size()-1]=='*'||str[str.size()-1]=='/'||str[str.size()-1]=='('||str[str.size()-1]==')') {
        return ;
    }
    else {
        str+=".";
        //一串小数只能有一个小数点的判断
        int num=0;
        for(int i=str.size()-2;i>=0;i--){
            if(str[i]=='.') num++;
            if(str[i]=='+'||str[i]=='-'||str[i]=='*'||str[i]=='/') break;
        }
        if(num>=1) str.chop(1);//如果小数点超出,则删除该次输入
        ui->LineAnswer->setText(str);
    }


}


void MainWindow::on_Presult_clicked()
{
    resultStr=calculater(str);
    str="";
    ui->LineAnswer->setText(calculater(resultStr));
}


/* 计算结果
 * 将中缀表达式转化为后缀表达式计算
 */
QString MainWindow::calculater(const QString& str)
{
    QQueue<QString> q=Split(str); //分离中缀
    q=Transfer(q);                //转换为后缀
    return Calculate(q);          //返回结果
}

/*void MainWindow::paintEvent(QPaintEvent *event)
{
    QPainter p(this);
    p.drawPixmap(0,0,width(),height(),QPixmap("../black.png"));
}*/

//分离前缀
QQueue<QString> MainWindow::Split(const QString &str)
{
    QQueue<QString> ret;
    QString num="";

    for(int i=0;i<str.length();i++)
    {
        if( (str[i]=='.') || ( (str[i]>='0') && (str[i]<='9') ))    //判断小数点和数字
        {
            num += str[i];
        }

        else if(str[i]== '(' || str[i]== ')' || str[i]== '*' || str[i]== '/' ||(str[i]=='^')  )
        {
            if(!num.isEmpty())
            {
                ret.enqueue(num);        //将数字入队列
                num.clear();
            }
            ret.enqueue(str[i]);
        }

        else if(str[i]== '+' || str[i]== '-')           // + - 需要特殊处理
        {
            if(i==0)       //表达式开头,说明是正负号
            {
             num+= str[i];
            }

            else if(str[i-1]=='(' || str[i-1]=='+' || str[i-1]=='-' || str[i-1]=='*' || str[i-1]=='/')
            {
             num+= str[i];
            }
            else        //否则是加减运算符
            {
                if(!num.isEmpty())
                {
                    ret.enqueue(num);        //将数字入队列
                    num.clear();
                }
             ret.enqueue(str[i]);
            }
        }
    }

    if(!num.isEmpty())         //遍历完成,判断是否还有数字
    {
        ret.enqueue(num);
        num.clear();
    }
return ret;
}

//将中缀队列转换为后缀队列
QQueue<QString> MainWindow::Transfer(QQueue<QString> &str)
{
    QStack<QString> stack;
    QQueue<QString> ret;
    bool num_ok;
    QString symbol;

    while(!str.isEmpty())
    {
      symbol = str.dequeue();   //出队列
      symbol.toDouble(&num_ok);

      if(num_ok==true)          //数字
      {
           stack.push(symbol);
      }

      else if(symbol=="+"||symbol=="-")
      {
          while(!stack.isEmpty() &&(stack.top()!="("))
          {
              ret.enqueue(stack.pop());     //取出栈顶运算符并入队列
          }
          stack.push(symbol);
      }

      else if(symbol=="*"||symbol=="/")
      {
          while(!stack.isEmpty() && (stack.top()!="(") && (stack.top()!="+") && (stack.top()!="-"))
          {
              ret.enqueue(stack.pop());     //取出栈顶运算符并入队列
          }
          stack.push(symbol);
      }

      else if(symbol=="^"){
          while(!stack.isEmpty() && (stack.top()!="(") && (stack.top()!="+") && (stack.top()!="-") && (stack.top()!="*") && (stack.top()!="/"))
          {
              ret.enqueue(stack.pop());     //取出栈顶运算符并入队列
          }
          stack.push(symbol);
      }

      else if(symbol == "(")
      {
         stack.push(symbol);
      }

      else if(symbol ==")")
      {
          while(!stack.isEmpty() && (stack.top()!="("))
          {
              ret.enqueue(stack.pop());     //取出栈顶运算符并入队列
          }
          if(stack.top()=="(")
            stack.pop();
      }
    }

    while(!stack.isEmpty()&& (stack.top()!="("))         //遍历完成,判断栈里是否为空
    {
       ret.enqueue(stack.pop());     //取出栈顶运算符并入队列
    }
    return ret;
}

//将后缀队列计算出结果
QString MainWindow::Calculate(QQueue<QString> &str)
{
    QStack<QString> stack;
    QString symbol,L,R,op,ret;
    bool num_ok;

    while(!str.isEmpty())
    {
      symbol = str.dequeue();   //出队列
      symbol.toDouble(&num_ok);

      if(num_ok==true)      //数字
      {
        stack.push(symbol);
      }
      else                  //运算符
      {
          if(stack.size()<2)
              return "Error";

          R= stack.pop();
          L= stack.pop();
          ret = Calculate(L,symbol,R );
          if(ret==NULL)
              return ret;

          stack.push(ret);
      }
    }
    if(stack.size()==1) //遍历完成,结果只有一个
    {
         return ValidNum(stack.pop());
    }
    else
    {return "Error";
    }
}

//后缀表达式中出栈两两计算
QString MainWindow::Calculate(QString &l, QString &op, QString &r)
{
    double left,right,res;
    QString ret="";
    left = l.toDouble();
    right = r.toDouble();
    if(op == "+")
    {
        res = left + right;
    }

    else if(op == "-")
    {
        res = left - right;
    }

    else if(op == "*")
    {
        res = left * right;
    }

    else if(op == "/")
    {
        if( (right>(-0.000000000000001)) && (right<(0.000000000000001)) )   //判断除数为0
            return NULL;
        else
            res = left/right;
    }
    else if(op=="^"){
        res = pow(left,right);
    }

    ret.sprintf("%f",res);
    return ret;
}

QString MainWindow::ValidNum(QString str) //如果不是小数直接返回,是小数则去掉多余的尾0和小数点
{
    QString num;
    if(str.indexOf(".")== -1) //判断是否小数
        return str;//没找到小数点 直接返回

    while(str.length()>1)   //避免0被去掉
    {
         num=str.right(1);
         if(num=="."||num=="0")
         {
             str.chop(1);
             if(num==".")
                 return  str;
         }
         else
             return str;
    }
    return str;
}


//以下为按下即生效的按键,直接产生结果,相当于按下后再按下等号

//转换正负
void MainWindow::on_Pchange_clicked(){

    if(str==""){
        if(resultStr[0]=='-'){
            resultStr[0]='+';
            ui->LineAnswer->setText(resultStr);
            return ;
        }
        if(resultStr[0]=='+'){
            resultStr[0]='-';
            ui->LineAnswer->setText(resultStr);
            return ;
        }
        if(resultStr[0]>='0'&&str[0]<='9'){
            resultStr.insert(0,'-');
            ui->LineAnswer->setText(resultStr);
            return ;
        }
    }
    else{
        if(str[0]=='-'){
            str[0]='+';
            ui->LineAnswer->setText(str);

            //相当于按下等号
            resultStr=str;
            str="";

            return ;
        }
        if(str[0]=='+'){
            str[0]='-';
            ui->LineAnswer->setText(str);

            //相当于按下等号
            resultStr=str;
            str="";

            return ;
        }
        if(str[0]>='0'&&str[0]<='9'){
            str.insert(0,'-');
            ui->LineAnswer->setText(str);

            resultStr=str;
            str="";

            return ;
        }
    }
}

//百分数
void MainWindow::on_Ppercent_clicked(){
    if(str==""){
        double dou=resultStr.toDouble();
        dou/=100;
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou/=100;
        str=QString::number(dou);
        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//平方
void MainWindow::on_Psquare_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou*=dou;
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou*=dou;
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//立方
void MainWindow::on_Pcube_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=dou*dou*dou;
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=dou*dou*dou;
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//开根号
void MainWindow::on_Psqrt_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=sqrt(dou);
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=sqrt(dou);
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//倒数
void MainWindow::on_Preciprocal_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=1/dou;
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=1/dou;
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//阶乘
void MainWindow::on_Pfactorial_clicked()
{

    long long int res=1;
    if(str==""){
        if(resultStr.indexOf('.')!=-1) return ;//小数不能阶乘
        double dou=resultStr.toDouble();
        for(int i=1;i<=dou;++i){
            res*=i;
        }
        dou=res;
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        if(str.indexOf('.')!=-1) return ;//小数不能阶乘
        double dou=str.toDouble();
        for(int i=1;i<=dou;++i){
            res*=i;
        }
        dou=res;
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//正弦
void MainWindow::on_Psin_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=sin(dou);
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=sin(dou);
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//余弦
void MainWindow::on_Pcos_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=cos(dou);
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=cos(dou);
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//正切
void MainWindow::on_Ptan_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=tan(dou);
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=tan(dou);
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}


//e的x次方
void MainWindow::on_PePower_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=exp(dou);
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=exp(dou);
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//10的x次方
void MainWindow::on_P10power_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=pow(10,dou);
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=pow(10,dou);
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//自然对数
void MainWindow::on_Pln_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=log(dou);
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=log(dou);
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}

//10为底的对数
void MainWindow::on_Plog10_clicked()
{

    if(str==""){
        double dou=resultStr.toDouble();
        dou=log10(dou);
        resultStr=QString::number(dou);

        ui->LineAnswer->setText(resultStr);
    }
    else{
        double dou=str.toDouble();
        dou=log10(dou);
        str=QString::number(dou);

        ui->LineAnswer->setText(str);

        //相当于按下等号
        resultStr=str;
        str="";

    }
}