代码
MyCalculator.h
#pragma once#include <QtWidgets/QMainWindow>#include <QStack>#include <QString>#include "ui_MyCalculator.h"class MyCalculator : public QMainWindow{ Q_OBJECTpublic: MyCalculator(QWidget *parent = Q_NULLPTR);/*void setnum1(int num);void setnum2(int num);void setflag(int f);int calculartor();*/private slots:void on_number_Button_clicked();void on_action_Button_clicked();void on_comma_Button_clicked();void on_action_Button_c_clicked();void on_action_Button_d_clicked();void on_action_Button_e_clicked();/*void on_action_Button_equal_clicked();void on_number_Button_clicked();void on_action_Button_clicked();void on_action_Button_c_clicked();*/private: Ui::MyCalculatorClass ui;};
MyCalculator.main
#include "MyCalculator.h"#include <QtWidgets/QApplication>int main(int argc, char *argv[]){ QApplication a(argc, argv); MyCalculator w; w.show(); return a.exec();}
MyCalculator.cpp
#include "MyCalculator.h"#include<iostream>using namespace std;#include<stack>#include<vector>#include<cstdlib>#include<limits.h>MyCalculator::MyCalculator(QWidget *parent) : QMainWindow(parent){ ui.setupUi(this);setWindowTitle(QStringLiteral("计算器"));ui.textBrowser->setFontPointSize(28);connect(ui.pushButton0, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton1, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton2, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton3, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton4, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton5, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton6, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton7, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton8, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton9, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton_add, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_div, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_mul, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_sub, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_right, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_left, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_dian, SIGNAL(clicked()), this, SLOT(on_comma_Button_clicked()));connect(ui.pushButton_del, SIGNAL(clicked()), this, SLOT(on_action_Button_d_clicked()));connect(ui.pushButton_re, SIGNAL(clicked()), this, SLOT(on_action_Button_c_clicked()));connect(ui.pushButton_equ, SIGNAL(clicked()), this, SLOT(on_action_Button_e_clicked()));/*//没有优先级的计算器connect(ui.pushButton0, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton1, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton2, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton3, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton4, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton5, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton6, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton7, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton8, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton9, SIGNAL(clicked()), this, SLOT(on_number_Button_clicked()));connect(ui.pushButton_add, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_div, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_mul, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_sub, SIGNAL(clicked()), this, SLOT(on_action_Button_clicked()));connect(ui.pushButton_re, SIGNAL(clicked()), this, SLOT(on_action_Button_c_clicked()));connect(ui.pushButton_equ, SIGNAL(clicked()), this, SLOT(on_action_Button_equal_clicked()));*/}void MyCalculator::on_number_Button_clicked(){QPushButton *btn = qobject_cast<QPushButton*>(sender());QString number = btn->text();QString ss = ui.textBrowser->toPlainText();ui.textBrowser->clear();ui.textBrowser->append(ss + number);}void MyCalculator::on_action_Button_clicked()//操作符{QPushButton *btn = qobject_cast<QPushButton*>(sender());QString action = btn->text();QString ss = ui.textBrowser->toPlainText();ui.textBrowser->clear();ui.textBrowser->append(ss + action);}void MyCalculator::on_comma_Button_clicked()//小数点{QPushButton *btn = qobject_cast<QPushButton*>(sender());QString action = btn->text();QString ss = ui.textBrowser->toPlainText();ui.textBrowser->clear();ui.textBrowser->append(ss + action);}void MyCalculator::on_action_Button_c_clicked()//重置输入框里的内容{ui.textBrowser->clear();}void MyCalculator::on_action_Button_d_clicked()//删除表达式中最后一个符号{QString ss = ui.textBrowser->toPlainText();//在一行ss = ss.left(ss.length() - 1);ui.textBrowser->clear();ui.textBrowser->setText(ss);}bool isNum(QString ch){if (ch >= '0' && ch <= '9' || ch == '.')return true;elsereturn false;}bool isOperate(QString ch){if (ch == '+' || ch == '-' || ch == '*' || ch == '/' || ch == '(' || ch == ')' )return true;elsereturn false;}int level(QString ch) {//优先级设置if(ch == '(')return 5;else if (ch == '*' || ch== '/') return 4;else if (ch == '+' || ch == '-')return 3;else if (ch == ')')return 2;}double calcu(double a ,double b, QString c){double result = 0;if (c == '+')result = b + a;else if (c == '-')result = b - a;else if (c == '*')result = b * a;else if (c == '/')result = b / a;elseresult = INT_MAX;return result;}double getjieguo(QString input){QStack<double> Num;QStack<QString> Act;int a = input.length();for(int i=0;i< a;i++){int flag = 0;//用来判断是否是数字int xiaoshu = 1;//用来判断是否是小数部分double number = 0;//暂存数字QString frist = input.left(1);while (isNum(frist))//连续的数字转化为一个整数{if (frist == '.' || xiaoshu == 2){number = frist.toDouble() / 10 + number;xiaoshu = 2;}else{number = number * 10 + frist.toInt();}input = input.right(input.length() - 1);frist = input.left(1);flag = 1;}if (flag == 1)Num.push(number);if (isOperate(frist)){if (!Act.empty() && (level(Act.top()) > level(frist))){double a = Num.pop();double b = Num.pop();QString c = Act.pop();double result = calcu(a, b, c);Num.push(result);if (frist != ')')Act.push(frist);input = input.right(input.length() - 1);frist = input.left(1);}else if (!Act.empty() && (level(Act.top()) <= level(frist))){if (frist != '(')Act.push(frist);input = input.right(input.length() - 1);frist = input.left(1);}else if(Act.empty())//操作符第一次入符号栈{Act.push(frist);input = input.right(input.length() - 1);frist = input.left(1);}}if (frist == '=')//支持得到结果后仍可以继续运算{Num.clear();Act.clear();input = input.right(input.length() - 1);frist = input.left(1);}if (i + 1 >= a)//当表达式都进栈后，只要符号栈不为空就继续执行{while (!Act.empty()){double a1 = Num.pop();double b1 = Num.pop();QString c1 = Act.pop();double result = calcu(a1, b1, c1);Num.push(result);}}}return Num.top();}void MyCalculator::on_action_Button_e_clicked(){QString input = ui.textBrowser->toPlainText();//将输入框里的内容给inputdouble value = getjieguo(input);//将表达式传给getjieguo来将数字和操作符分别入对应的栈ui.textBrowser->clear();ui.textBrowser->append(input + "=" + QString::number(value));//将结果的类型由数字转化为QString}/*void MyCalculator::setnum1(int num){num1 = num;}void MyCalculator::setnum2(int num){num2 = num;}void MyCalculator::setflag(int f){flag = f;}int MyCalculator::calculartor(){int result = 0;if (flag == 1)result = num1 + num2;else if (flag == 2)result = num1 - num2;else if (flag == 3)result = num1 * num2;else if (flag == 4){if (num2 == 0)setflag(5);elseresult = num1 / num2;}elseresult = 0;return result;}void MyCalculator::on_action_Button_c_clicked(){ui.textBrowser->clear();setnum1(0);setnum2(0);setflag(0);}void MyCalculator::on_number_Button_clicked(){QPushButton *btn = qobject_cast<QPushButton*>(sender());QString number = btn->text();QString ss = ui.textBrowser->toPlainText();ui.textBrowser->clear();ui.textBrowser->append(ss + number);}void MyCalculator::on_action_Button_clicked(){int number = ui.textBrowser->toPlainText().toInt();setnum1(number);QPushButton *btn = qobject_cast<QPushButton*>(sender());QString action = btn->text();ui.textBrowser->clear();if (action == "+")setflag(1);else if (action == "-")setflag(2);else if (action == "*")setflag(3);elsesetflag(4);}void MyCalculator::on_action_Button_equal_clicked() {int number = ui.textBrowser->toPlainText().toInt();setnum2(number);int res = calculartor();ui.textBrowser->clear();if (flag == 5)ui.textBrowser->append(QStringLiteral("不能除于0，请重新输入"));elseui.textBrowser->append(QString::number(res));}*/
测试
说明
- 自己的学习笔记 ，还有一些bug没有解决； 部分代码需要优化，重构； 没有实现输入错误表达式报错功能，需要输入正确的表达式。 不支持负数计算。 支持小数，加，减，乘，除，括号运算。
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