暂且偷一下书上代码
This commit is contained in:
iridiumR
parent
094ec9498a
commit
99f5635fc1
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@ -0,0 +1,26 @@
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QT += core gui
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
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CONFIG += c++17
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# You can make your code fail to compile if it uses deprecated APIs.
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# In order to do so, uncomment the following line.
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#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
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SOURCES += \
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cal.cpp \
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main.cpp \
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mainwindow.cpp
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HEADERS += \
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cal.h \
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mainwindow.h
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FORMS += \
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mainwindow.ui
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# Default rules for deployment.
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qnx: target.path = /tmp/$${TARGET}/bin
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else: unix:!android: target.path = /opt/$${TARGET}/bin
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!isEmpty(target.path): INSTALLS += target
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@ -0,0 +1,164 @@
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#include "cal.h"
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QString inToPost(QString infix) {
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std::stack<char> stack;
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char current = 0; //读入的字符
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QString postfix; //写入后缀表达式的字符串
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std::map<char, int> priority; //运算符号优先级表
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priority['+'] = 0;
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priority['-'] = 0;
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priority['*'] = 1;
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priority['/'] = 1;
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priority['^'] = 2;
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for (int i = 0; i < infix.length(); ++i) //逐个读取中缀表达式字符串中的字符
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{
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current = infix[i].toLatin1();
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if (isdigit(current)) //如果是数字直接输出
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{
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postfix.push_back(current);
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continue;
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}
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switch (current) {
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case '+':
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case '-':
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case '*':
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case '/':
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case '^':
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// postfix.push_back('#');
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if (i >
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0) //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#标识前面几个字符组成一个数字
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{
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if (infix[i - 1] != ')')
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postfix.push_back('#');
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/*if(infix[i-1].isDigit())
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postfix.push_back('#');
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else
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throw "expression is illegality";*/
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} else
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postfix.push_back('#');
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if (!stack
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.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
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{
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char tempTop = stack.top();
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while (tempTop != '(' && priority[current] <= priority[tempTop]) {
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stack.pop();
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postfix.push_back(tempTop);
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if (stack.empty())
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break;
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tempTop = stack.top();
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}
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}
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stack.push(
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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
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break;
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case '.':
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postfix.push_back(current);
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break;
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case '%':
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postfix.push_back(current);
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break;
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case '(':
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stack.push(current); //左括号直接入栈
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break;
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case ')':
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postfix.push_back('#'); //右括号说明前方数字输入完成，标识一下
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char tempTop;
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tempTop = stack.top();
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while (tempTop != '(') //直到栈顶元素是左括号才停止循环
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{
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stack.pop();
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postfix.push_back(tempTop);
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tempTop = stack.top();
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}
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stack.pop();
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break;
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default:
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throw "expression has illegality character";
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break;
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}
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}
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if (infix[infix.size() - 1] != ')') {
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if (infix[infix.size() - 1].isDigit())
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postfix.push_back('#');
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else
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throw "expression is illegality";
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}
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while (!stack.empty()) {
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char tempOut = stack.top();
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stack.pop();
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postfix.push_back(tempOut);
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}
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return postfix;
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}
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double compute(QString s) {
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std::stack<double> stack;
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QString str;
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double curr;
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double temNum1;
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double temNum2;
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for (auto i = s.begin(); i != s.end(); i++) {
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if ((*i).isDigit()) {
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str.push_back(*i);
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continue;
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}
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switch ((*i).toLatin1()) {
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case '+':
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temNum1 = stack.top();
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stack.pop();
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temNum2 = stack.top();
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stack.pop();
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stack.push(temNum2 + temNum1);
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break;
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case '-':
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temNum1 = stack.top();
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stack.pop();
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temNum2 = stack.top();
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stack.pop();
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stack.push(temNum2 - temNum1);
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break;
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case '*':
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temNum1 = stack.top();
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stack.pop();
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temNum2 = stack.top();
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stack.pop();
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stack.push(temNum2 * temNum1);
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break;
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case '/':
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temNum1 = stack.top();
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stack.pop();
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temNum2 = stack.top();
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stack.pop();
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stack.push(temNum2 / temNum1);
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break;
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case '^':
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temNum1 = stack.top();
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stack.pop();
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temNum2 = stack.top();
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stack.pop();
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stack.push(pow(temNum2, temNum1));
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break;
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case '.':
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str.push_back(*i);
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break;
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case '#':
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curr = str.toDouble(); //字符串转换为浮点型
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str.clear();
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stack.push(curr);
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break;
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case '%':
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curr = stack.top();
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stack.pop();
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curr *= 0.01;
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stack.push(curr);
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break;
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default:
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throw "expression has illegality character";
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break;
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}
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}
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curr = stack.top();
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return curr;
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}
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@ -0,0 +1,15 @@
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#ifndef CAL_H
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#define CAL_H
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#include "mainwindow.h"
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#include <QDebug>
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#include <QKeyEvent>
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#include <QMessageBox>
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#include <QMouseEvent>
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#include <cmath>
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#include <iostream>
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#include <map>
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#include <stack>
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QString inToPost(QString infix);
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double compute(QString s);
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#endif // CAL_H
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#include "mainwindow.h"
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#include <QApplication>
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int main(int argc, char *argv[])
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{
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QApplication a(argc, argv);
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MainWindow w;
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w.show();
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return a.exec();
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}
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#include "mainwindow.h"
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#include "cal.h"
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#include "ui_mainwindow.h"
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#include <QMessageBox>
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static QString displayText;
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent), ui(new Ui::MainWindow) {
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ui->setupUi(this);
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ui->lineEdit->setText("0");
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result = 0.0;
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waitForOperand = true;
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connectSlots();
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}
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MainWindow::~MainWindow() { delete ui; }
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//错误处理
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void MainWindow::abortOperation() {
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result = 0.0;
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pendingOperator.clear();
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ui->lineEdit->setText("0");
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isFinished = false;
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QMessageBox::warning(this, "运算错误", "算式不合法");
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}
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//数字被点击
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void MainWindow::digitClicked() {
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QPushButton *digitBtn = static_cast<QPushButton *>(sender());
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// if(ui->lineEdit->text() == "0" && value == "0")
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// return;
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if (!isFinished) {
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displayText.append(digitBtn->text());
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ui->lineEdit->setText(displayText);
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} else {
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return;
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}
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}
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void MainWindow::on_clearBtn_clicked() {
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//将当前显示的数归零
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displayText.chop(1);
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ui->lineEdit->setText(displayText);
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isFinished = false;
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}
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void MainWindow::on_clearAllBtn_clicked() {
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//将当前显示的数据归零，并将之前保存的数据运算清除
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displayText.clear();
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ui->lineEdit->setText(displayText);
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isFinished = false;
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result = 0.0;
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}
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void MainWindow::on_equalBtn_clicked() {
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try {
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result = compute(inToPost(ui->lineEdit->text()));
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}
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catch (...) {
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abortOperation();
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}
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isFinished = 1;
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ui->lineEdit->setText(QString::number(result));
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}
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//运算符
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void MainWindow::operatorClicked() {
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QPushButton *clickedBtn = qobject_cast<QPushButton *>(sender());
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if (!isFinished) {
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displayText.append(clickedBtn->text());
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ui->lineEdit->setText(displayText);
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} else {
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return;
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}
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}
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//槽链接
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void MainWindow::connectSlots() {
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QPushButton *digitBtns[10] = {ui->digitBtn0, ui->digitBtn1, ui->digitBtn2,
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ui->digitBtn3, ui->digitBtn4, ui->digitBtn5,
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ui->digitBtn6, ui->digitBtn7, ui->digitBtn8,
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ui->digitBtn9};
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for (auto btn : digitBtns)
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connect(btn, &QPushButton::clicked, this, &MainWindow::digitClicked);
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QPushButton *operatorBtns[8] = {
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ui->addBtn, ui->subtractionBtn, ui->mulBtn, ui->divisionBtn,
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ui->squareBtn, ui->pointBtn, ui->LBtn, ui->RBtn};
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for (auto btn : operatorBtns)
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connect(btn, &QPushButton::clicked, this, &MainWindow::operatorClicked);
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}
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void MainWindow::keyPressEvent(QKeyEvent *event) {
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switch (event->key()) {
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case Qt::Key_0:
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emit ui->digitBtn0->clicked();
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break;
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case Qt::Key_1:
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emit ui->digitBtn1->clicked();
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break;
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case Qt::Key_2:
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emit ui->digitBtn2->clicked();
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break;
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case Qt::Key_3:
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emit ui->digitBtn3->clicked();
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break;
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case Qt::Key_4:
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emit ui->digitBtn4->clicked();
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break;
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case Qt::Key_5:
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emit ui->digitBtn5->clicked();
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break;
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case Qt::Key_6:
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emit ui->digitBtn6->clicked();
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break;
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case Qt::Key_7:
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emit ui->digitBtn7->clicked();
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break;
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case Qt::Key_8:
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default:
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break;
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}
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}
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@ -0,0 +1,48 @@
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#ifndef MAINWINDOW_H
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#define MAINWINDOW_H
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#include <QKeyEvent>
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#include <QMainWindow>
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QT_BEGIN_NAMESPACE
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namespace Ui {
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class MainWindow;
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}
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QT_END_NAMESPACE
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class MainWindow : public QMainWindow {
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Q_OBJECT
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public:
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MainWindow(QWidget *parent = nullptr);
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~MainWindow();
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private:
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Ui::MainWindow *ui;
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void keyPressEvent(QKeyEvent *e);
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//终止运算，清除数据，报错
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void abortOperation();
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//连接信号和槽
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void connectSlots();
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//储存运算符
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QString pendingOperator;
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//储存运算结果
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double result;
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//标记是否等待一个操作数
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bool waitForOperand;
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bool isFinished;
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private slots:
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void on_clearBtn_clicked();
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void on_clearAllBtn_clicked();
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void on_equalBtn_clicked();
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void digitClicked();
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void operatorClicked();
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};
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#endif // MAINWINDOW_H
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@ -0,0 +1,194 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<ui version="4.0">
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<class>MainWindow</class>
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<widget class="QMainWindow" name="MainWindow">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>406</width>
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<height>362</height>
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</rect>
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</property>
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<property name="windowTitle">
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<string>Calculator_v3_4490</string>
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</property>
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<property name="toolButtonStyle">
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<enum>Qt::ToolButtonTextOnly</enum>
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</property>
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<widget class="QWidget" name="centralwidget">
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<layout class="QGridLayout" name="gridLayout">
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<item row="4" column="1">
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<widget class="QPushButton" name="digitBtn8">
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<property name="text">
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<string>8</string>
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</property>
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</widget>
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</item>
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<item row="4" column="2">
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<widget class="QPushButton" name="digitBtn9">
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<property name="text">
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<string>9</string>
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</property>
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</widget>
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</item>
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<item row="4" column="0">
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<widget class="QPushButton" name="digitBtn7">
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<property name="text">
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<string>7</string>
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</property>
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</widget>
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</item>
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<item row="5" column="1">
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<widget class="QPushButton" name="digitBtn0">
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<property name="text">
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<string>0</string>
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</property>
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</widget>
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</item>
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<item row="0" column="0" colspan="4">
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<widget class="QLineEdit" name="lineEdit">
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<property name="alignment">
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<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
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</property>
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<property name="readOnly">
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<bool>true</bool>
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</property>
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</widget>
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</item>
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<item row="2" column="3">
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<widget class="QPushButton" name="addBtn">
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<property name="text">
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<string>+</string>
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</property>
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</widget>
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</item>
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<item row="5" column="3">
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<widget class="QPushButton" name="divisionBtn">
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<property name="text">
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<string>/</string>
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</property>
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</widget>
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</item>
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<item row="2" column="2">
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<widget class="QPushButton" name="digitBtn3">
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<property name="text">
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<string>3</string>
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</property>
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</widget>
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</item>
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<item row="2" column="1">
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<widget class="QPushButton" name="digitBtn2">
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<property name="text">
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<string>2</string>
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</property>
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</widget>
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</item>
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<item row="2" column="0">
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<widget class="QPushButton" name="digitBtn1">
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<property name="text">
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<string>1</string>
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</property>
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</widget>
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</item>
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<item row="4" column="3">
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<widget class="QPushButton" name="mulBtn">
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<property name="text">
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<string>*</string>
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</property>
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</widget>
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</item>
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<item row="3" column="2">
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<widget class="QPushButton" name="digitBtn6">
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<property name="text">
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<string>6</string>
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</property>
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</widget>
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</item>
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<item row="5" column="2">
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<widget class="QPushButton" name="squareBtn">
|
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<property name="text">
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<string>^</string>
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</property>
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</widget>
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</item>
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<item row="3" column="1">
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<widget class="QPushButton" name="digitBtn5">
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<property name="text">
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<string>5</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
<item row="3" column="0">
|
||||
<widget class="QPushButton" name="digitBtn4">
|
||||
<property name="text">
|
||||
<string>4</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
<item row="5" column="0">
|
||||
<widget class="QPushButton" name="pointBtn">
|
||||
<property name="text">
|
||||
<string>.</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
<item row="3" column="3">
|
||||
<widget class="QPushButton" name="subtractionBtn">
|
||||
<property name="text">
|
||||
<string>-</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
<item row="6" column="2" colspan="2">
|
||||
<widget class="QPushButton" name="equalBtn">
|
||||
<property name="text">
|
||||
<string>=</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
<item row="6" column="0">
|
||||
<widget class="QPushButton" name="LBtn">
|
||||
<property name="text">
|
||||
<string>(</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
<item row="1" column="2" colspan="2">
|
||||
<widget class="QPushButton" name="clearAllBtn">
|
||||
<property name="text">
|
||||
<string>ClearAll</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
<item row="1" column="0" colspan="2">
|
||||
<widget class="QPushButton" name="clearBtn">
|
||||
<property name="text">
|
||||
<string>Back</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
<item row="6" column="1">
|
||||
<widget class="QPushButton" name="RBtn">
|
||||
<property name="text">
|
||||
<string>)</string>
|
||||
</property>
|
||||
</widget>
|
||||
</item>
|
||||
</layout>
|
||||
</widget>
|
||||
<widget class="QMenuBar" name="menubar">
|
||||
<property name="geometry">
|
||||
<rect>
|
||||
<x>0</x>
|
||||
<y>0</y>
|
||||
<width>406</width>
|
||||
<height>30</height>
|
||||
</rect>
|
||||
</property>
|
||||
</widget>
|
||||
<widget class="QStatusBar" name="statusbar"/>
|
||||
</widget>
|
||||
<resources/>
|
||||
<connections/>
|
||||
</ui>
|
||||
Reference in New Issue