Qt5 编写的简单计算

学Q5不久,小试牛刀，下面的截图是Qt5 编写的简单计算。下面是源码
//calculator.h#ifndef CALCULATOR_H
#define CALCULATOR_H#include<QTextEdit>
#include<QPushButton>
#include<QAction>
//#include<QtWidgets>
#include<QVector>
/*
先将表达式的单个字符依次存储到容器内，当出现“=”时，再将其
取出送入到相应的操作数容器和操作符容器为尽可能的接受用户不
规范的输入，设置了很多标志开关，有些乱还有bug未能解决.
*/
class Calculator : public QWidget
{
Q_OBJECTpublic:
Calculator（QWidget *parent = 0）;
~Calculator（）;
private:
QTextEdit* screenTextEdit;//表达式显示屏
QPushButton* button1;
QPushButton* button2;
QPushButton* button3;
QPushButton* button4;
QPushButton* button5;
QPushButton* button6;
QPushButton* button7;
QPushButton* button8;
QPushButton* button9;
QPushButton* button0;
QPushButton* buttonx;// sign "*"
QPushButton* buttondivide;// sign "/"
QPushButton* buttonadd;// sign "+
QPushButton* buttonsub;// sign "-"
QPushButton* buttondot;// sign "."
QPushButton* buttonequal;// sign "="
QPushButton* buttonclear;//清屏
QPushButton* buttonback;// backspace
QPushButton* buttonLArc;// sign "（"
QPushButton* buttonRArc;// sign "）"
bool isEnter;//作为是否换行的依据,注意是光标先换行
double sum ;//临时存放操作数
int i;//转化成小数的除数
int j;//压入操作数栈的开关
double result;//计算所得结果
bool isPoint;//是否出现小数点
bool isLArc;//标记是否出现（以便判断区分出类似"（-2"形式
char sign;//用来存放符号
bool isTwoOptrsFlag;//++, -+ ...
bool isEqualClicked;//作为是否回退容器内的字符的开关
int f1[7];//栈内符号优先级
int f2[7];//栈外符号优先级
//建立操作数和操作符的栈
QVector<double>vectorOpnd;
QVector<char>vectorOptr;
QVector<char>vectorExp; bool isTwoOptr（QPushButton *button）;//++, -+ ...
void initConnect（）;
void initVector（）;
double operate（double a, char theat, double b）;//进行两个操作数的运算,返回结果
char precedeSign（char optr1, char optr2）;//比较栈内和栈外符号的优先级
int char2num（char optr）;//获取符号在优先级数组中的序号
void initData（）;//初始化各个标志变量
char button2char（QPushButton *button）;//按钮转化为相应符号
void getDigital（char digital）;//进行数字的进栈操作
void getSign（char ch）;//获取符号
bool pickSign（char ch）;//分拣符号，以便进行相应的操作
bool pushVector（char optr）;//进行符号的进栈操作
void getResult（）;//
private slots:
void getButton（）;//获取按下的按钮
void clearScreen（）;//清屏
void myBackSpace（）;//执行backspace};#endif // CALCULATOR_H
//calculator.cpp
#include "calculator.h"
#include<QGridLayout>
//#include<QDebug>Calculator::Calculator（QWidget *parent）
: QWidget（parent）
{
initData（）;
setWindowTitle（"计算器"）;
setWindowIcon（QIcon（":/calculator.png"））;
screenTextEdit = new QTextEdit;
screenTextEdit->setFont（QFont（"Courier 10 Pitch", 18, QFont::Bold））;
screenTextEdit->setReadOnly（true）;
// screenTextEdit->setEnabled（false）;
button1 = new QPushButton（"1"）;
button2 = new QPushButton（"2"）;
button3 = new QPushButton（"3"）;
button4 = new QPushButton（"4"）;
button5 = new QPushButton（"5"）;
button6 = new QPushButton（"6"）;
button7 = new QPushButton（"7"）;
button8 = new QPushButton（"8"）;
button9 = new QPushButton（"9"）;
button0 = new QPushButton（"0"）;
buttonx = new QPushButton（"×"）;
buttonadd = new QPushButton（"+"）;//
buttonsub = new QPushButton（"-"）;
buttonback = new QPushButton（"back"）;
buttondivide = new QPushButton（"/"）;
buttondot = new QPushButton（"."）;
buttonLArc = new QPushButton（"（"）;
buttonRArc = new QPushButton（"）"）;
buttonequal = new QPushButton（"="）;
buttonclear = new QPushButton（"clear"）; initConnect（）; QGridLayout *gridLayout = new QGridLayout;
gridLayout->addWidget（screenTextEdit, 0, 0, 2, 5）;
gridLayout->addWidget（button1, 2, 0, 1, 1）;
gridLayout->addWidget（button2, 2, 1, 1 ,1）;
gridLayout->addWidget（button3, 2, 2, 1, 1）;
gridLayout->addWidget（buttonadd, 2, 3, 1, 1）;
gridLayout->addWidget（buttonsub, 2, 4, 1, 1）;
gridLayout->addWidget（button4, 3, 0, 1, 1）;
gridLayout->addWidget（button5, 3, 1, 1, 1）;
gridLayout->addWidget（button6, 3, 2, 1, 1）;
gridLayout->addWidget（buttonx, 3, 3, 1, 1）;
gridLayout->addWidget（buttondivide, 3, 4, 1, 1）;
gridLayout->addWidget（button7, 4, 0, 1, 1）;
gridLayout->addWidget（button8, 4, 1, 1, 1）;
gridLayout->addWidget（button9, 4, 2, 1, 1）;
gridLayout->addWidget（buttonLArc, 4, 3, 1, 1）;
gridLayout->addWidget（buttonRArc, 4, 4, 1, 1）;
gridLayout->addWidget（button0, 5, 0, 1, 1）;
gridLayout->addWidget（buttondot, 5, 1, 1, 1）;
gridLayout->addWidget（buttonback, 5, 2, 1, 1）;
gridLayout->addWidget（buttonclear, 5, 3, 1, 1）;
gridLayout->addWidget（buttonequal, 5, 4, 1, 1）; setLayout（gridLayout）;
initVector（）;
}
void Calculator::initConnect（）
{
connect（button0, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button1, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button2, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button3, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button4, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button5, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button6, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button7, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button8, &QPushButton::clicked, this, &Calculator::getButton）;
connect（button9, &QPushButton::clicked, this, &Calculator::getButton）;
connect（buttonx, &QPushButton::clicked, this, &Calculator::getButton）;
connect（buttonadd, &QPushButton::clicked, this, &Calculator::getButton）;
connect（buttondivide, &QPushButton::clicked, this, &Calculator::getButton）;
connect（buttondot, &QPushButton::clicked, this, &Calculator::getButton）;
connect（buttonsub, &QPushButton::clicked, this, &Calculator::getButton）;
connect（buttonRArc, &QPushButton::clicked, this, &Calculator::getButton）;
connect（buttonLArc, &QPushButton::clicked, this, &Calculator::getButton）; connect（buttonback, &QPushButton::clicked, this, &Calculator::myBackSpace）;
connect（buttonclear, &QPushButton::clicked, this, &Calculator::clearScreen）;
connect（buttonequal, &QPushButton::clicked, this, &Calculator::getButton）;
}bool Calculator::isTwoOptr（QPushButton *button）
{
if（button == buttonadd || button ==buttonsub
|| button == buttonx || button == buttondivide）
return true;
else
return false;
}
void Calculator::myBackSpace（）
{
QTextCursor cursor = screenTextEdit->textCursor（）;
cursor.deletePreviousChar（）;
if（！isEqualClicked）
vectorExp.pop_back（）;}void Calculator::getButton（）
{
QPushButton* button = qobject_cast<QPushButton*>（sender（））;
if（isTwoOptrsFlag && isTwoOptr（button））
{ }
else{ vectorExp.append（button2char（button））;
isEqualClicked = false;
isTwoOptrsFlag = false;
if（！isEnter）
screenTextEdit->append（""）;
screenTextEdit->insertPlainText（button->text（））;
isEnter = true;
if（button == buttonadd || button == buttonsub
|| button == buttonx || button == buttondivide）
isTwoOptrsFlag = true;
} if（button == buttonequal）
{
isEqualClicked = true;
getResult（）;
}
}void Calculator::getResult（）
{
while（！vectorExp.isEmpty（））
{
char ch = vectorExp.first（）;
vectorExp.removeFirst（）;
getDigital（ch）;
getSign（ch）;
}
}
void Calculator::getDigital（char digital）
{
if（digital == "0" || digital == "1" || digital == "2"
|| digital == "3" || digital == "4" || digital == "5"
|| digital == "6" || digital == "7" || digital == "8"
|| digital == "9" ）
{
if（isPoint）
i *= 10;//i初值是1
j = 0;//j标记是否连续字符输入
sum = sum * 10 + （digital - "0"）;
isLArc = false; }
else if（digital == "."）
{
isPoint = true;
isLArc = false;
}
}void Calculator::getSign（char ch）
{
if（isLArc && ch ！= "（" && ch ！= "）"）
{
sign = ch;
}
else if（ch == "+" || ch == "-"
|| ch == "*" || ch == "/"
|| ch == "=" || ch == "（"
|| ch == "）"）
{
if（ch == "（"）
isLArc = true;
else
isLArc = false; j++;
if（j <=1）
{
if（sign == "-"）
sum = sum * （-1）;
sign = " ";
vectorOpnd.append（sum / i）;
isLArc = false;
i = 1;
sum = 0;
isPoint = false;
}
pickSign（ch）; }
}
bool Calculator::pickSign（char ch）
{
char theta;
double a, b;
if（ch == "="）
{
while（vectorOptr.last（）！= "#"）
{
do{
theta = vectorOptr.last（）;
vectorOptr.pop_back（）;
}while（theta == "（" || theta == "）"）; if（theta ！= "#"）//void 8（,9）,8（）
{
b = vectorOpnd.last（）;vectorOpnd.pop_back（）;
a = vectorOpnd.last（）;vectorOpnd.pop_back（）;
vectorOpnd.append（operate（a, theta, b））;
}
else if（theta == "#"）
vectorOptr.append（"#"）;
}
result = vectorOpnd.last（）;
screenTextEdit->insertPlainText（QString（"%1"）.arg（result））;
vectorOpnd.clear（）;
vectorOptr.clear（）;
initVector（）;
isEnter = false;
return true;
}
pushVector（ch）;
return true;
}bool Calculator::pushVector（char optr）
{
char theta;
double a, b;
if（optr == "）"）
{
do{
theta = vectorOptr.last（）;
vectorOptr.pop_back（）;
}while（theta == "（" || theta == "）"）;
if（theta ！= "#"）// void 8（,9）,8（）
{
b = vectorOpnd.last（）;vectorOpnd.pop_back（）;
a = vectorOpnd.last（）;vectorOpnd.pop_back（）;
vectorOpnd.append（operate（a, theta, b））;
}
else
{
vectorOptr.append（"#"）;
}
return true;
} switch（precedeSign（vectorOptr.last（）,optr））
{
case "<":
vectorOptr.append（optr）;
break;
case "=":
vectorOptr.pop_back（）;
break;
case ">":
theta = vectorOptr.last（）;
vectorOptr.pop_back（）;
b = vectorOpnd.last（）;
vectorOpnd.pop_back（）;
a = vectorOpnd.last（）;
vectorOpnd.pop_back（）;
vectorOpnd.append（operate（a, theta, b））;
vectorOptr.append（optr）;
break;
}
return true;
}
void Calculator::clearScreen（）
{
screenTextEdit->clear（）;
result = 0;
isEnter = true;
}double Calculator::operate（double a, char theta, double b）
{
double sum1;
switch （theta） {
case "+":
sum1 = a + b; break;
case "-":
sum1 = a - b; break;
case "*":
sum1 = a * b; break;
case "/":
sum1 = a / b; break;
}
return sum1;
}char Calculator::button2char（QPushButton *button）
{
char optr;
if（button == buttonadd）
optr = "+";
else if（button == buttonsub）
optr = "-";
else if（button == buttonx）
optr = "*";
else if（button == buttondivide）
optr = "/";
else if（button == buttonLArc）
optr = "（";
else if（button == buttonRArc）
optr = "）";
else if（button == buttonequal）
optr = "=";
else if（button == button0）
optr = "0";
else if（button == button1）
optr = "1";
else if（button == button2）
optr = "2";
else if（button == button3）
optr = "3";
else if（button == button4）
optr = "4";
else if（button == button5）
optr = "5";
else if（button == button6）
optr = "6";
else if（button == button7）
optr = "7";
else if（button == button8）
optr = "8";
else if（button == button9）
optr = "9";
else if（button == buttondot）
optr = ".";
return optr;
}
char Calculator::precedeSign（char optr1, char optr2）
{
char compare;
int i1 = char2num（optr1）;
int i2 = char2num（optr2）; if（f1[i1] > f2[i2]）
compare = ">";
else if（f1[i1] < f2[i2]）
compare = "<";
else
compare = "=";
return compare;}
int Calculator::char2num（char optr）
{
int ii;
switch（optr）
{
case "+":
ii = 0; break;
case "-":
ii = 1; break;
case "*":
ii = 2; break;
case "/":
ii = 3; break;
case "（":
ii = 4; break;
case "）":
ii = 5; break;
default:
ii = 6;
}
return ii;
}
void Calculator::initData（）
{
i = 1;
j = 0;
sum = 0;
f1[0] = f1[1] =3; f1[2] = f1[3] = 5; f1[4] = 1;
f1[5] = 6; f1[6] = 0;
f2[0] = f2[1] = 2; f2[2] = f2[3] = 4; f2[4] = 6;
f2[5] = 1; f2[6] = 0;
isPoint = false;
isLArc = false;
sign = " ";
isTwoOptrsFlag = false;
isEqualClicked = false;
isEnter = true;
}void Calculator::initVector（）
{
vectorOptr.append（"#"）;
vectorOpnd.append（0）;
vectorOpnd.append（0）;
vectorOpnd.append（0）;
}Calculator::~Calculator（）
{}//main.cpp
#include "calculator.h"
#include <QApplication>int main（int argc, char *argv[]）
{
QApplication a（argc, argv）;
Calculator cal;
cal.show（）; return a.exec（）;
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