高精度计算器-Qt版

代码

widget.h 文件

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <vector>
#include <stack>
using namespace std;QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private slots:void on_oneButton_clicked();void on_twoButton_clicked();void on_threeButton_clicked();void on_fourButton_clicked();void on_fiveButton_clicked();void on_sixButton_clicked();void on_sevenButton_clicked();void on_eightButton_clicked();void on_nineButton_clicked();void on_addButton_clicked();void on_subButton_clicked();void on_mulButton_clicked();void on_divButton_clicked();void on_zeroButton_clicked();void on_CButton_clicked();void on_backspaceButton_clicked();void on_equalButton_clicked();void on_dotButton_clicked();private:Ui::Widget *ui;QString expression;stack<string> nums,op;QString eval();string add(string& a,string& b),sub(string& a,string& b),mul(string& a,string& b),div(string& a,long long b,long long& r);vector<int> To_vector(string& s);string To_string(vector<int>& A);bool cmp(string& a, string& b);};
#endif // WIDGET_H

main 文件

#include "widget.h"#include <QApplication>
#include <QLocale>
#include <QTranslator>
#include <QStyleFactory>int main(int argc, char *argv[])
{QApplication a(argc, argv);a.setStyle(QStyleFactory::create("Fusion"));QTranslator translator;const QStringList uiLanguages = QLocale::system().uiLanguages();for (const QString &locale : uiLanguages) {const QString baseName = "calculator_1_" + QLocale(locale).name();if (translator.load(":/i18n/" + baseName)) {a.installTranslator(&translator);break;}}Widget w;w.show();return a.exec();
}

widget.cpp 文件

#include "widget.h"
#include "./ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);this->setWindowTitle("计算器");QFont f("仿宋", 14);ui->lineEdit->setFont(f);ui->equalButton->setShortcut(Qt::Key_Return); //设置按钮关联到Enter键ui->equalButton->setShortcut(Qt::Key_Enter);//将小键盘回车键与登录按钮绑定在一起ui->backspaceButton->setShortcut(Qt::Key_Backspace);ui->zeroButton->setShortcut(Qt::Key_0);ui->oneButton->setShortcut(Qt::Key_1);ui->twoButton->setShortcut(Qt::Key_2);ui->threeButton->setShortcut(Qt::Key_3);ui->fourButton->setShortcut(Qt::Key_4);ui->fiveButton->setShortcut(Qt::Key_5);ui->sixButton->setShortcut(Qt::Key_6);ui->sevenButton->setShortcut(Qt::Key_7);ui->eightButton->setShortcut(Qt::Key_8);ui->nineButton->setShortcut(Qt::Key_9);ui->addButton->setShortcut(Qt::Key_Plus);ui->subButton->setShortcut(Qt::Key_Minus);ui->mulButton->setShortcut(Qt::Key_Asterisk);ui->divButton->setShortcut(Qt::Key_Slash);ui->lineEdit->setReadOnly(true); // 设置为只读状态// ui->lineEdit->setFont(QFont("0",16));
}Widget::~Widget()
{delete ui;
}vector<int> Widget::To_vector(string& s) {vector<int> A;for (int i = s.size() - 1; i >= 0; i--) A.push_back(s[i] - '0');return A;
}string Widget::To_string(vector<int>& A) {string s;for (int i = A.size() - 1; i >= 0; i--) s += '0' + A[i];return s;
}// 比较a，b大小
bool Widget::cmp(string& a, string& b) {if (a.size() == b.size()) {for (int i = 0; i <= a.size() - 1; i++) {if (a[i] != b[i]) return a[i] > b[i];}return true;}else return a.size() > b.size();
}string Widget::sub(string& a, string& b) {if (!cmp(a, b)) return ("-" + sub(b, a));vector<int> A = To_vector(a), B = To_vector(b), C;int t = 0;for (int i = 0; i < A.size(); i++) {t = t + A[i];if (i < B.size()) t = t - B[i];C.push_back((t + 10) % 10);if (t < 0) t = -1;else t = 0;}while (C.size() > 1 && C.back() == 0) C.pop_back();return To_string(C);
}string Widget::add(string& a, string& b) {vector<int> A = To_vector(a), B = To_vector(b);vector<int> C(max(A.size(), B.size()) + 10, 0);for (int i = 0; i < A.size(); i++) C[i] += A[i];for (int i = 0; i < B.size(); i++) C[i] += B[i];for (int i = 0; i < C.size(); i++) {C[i + 1] += C[i] / 10;C[i] = C[i] % 10;}while (C.size() > 1 && C.back() == 0) C.pop_back();return To_string(C);
}string Widget::mul(string& a, string& b) {vector<int> A = To_vector(a), B = To_vector(b);vector<int> C(A.size() + B.size() + 10, 0);for (int i = 0; i < A.size(); i++) {for (int j = 0;j < B.size();j++) {C[i + j] += A[i] * B[j];                  //+=}}for (int i = 0; i + 1 < C.size(); i++) {C[i + 1] += C[i] / 10;                        //+=C[i] = C[i] % 10;}while (C.size() > 1 && C.back() == 0) C.pop_back();return To_string(C);
}// r是余数
string Widget::div(string& a, long long b, long long& r) {vector<int> A = To_vector(a), C;r = 0;for (int i = A.size() - 1; i >= 0; i--) {r = r * 10 + A[i];C.push_back(r / b);r = r % b;}reverse(C.begin(), C.end());while (C.size() > 1 && C.back() == 0) C.pop_back();return To_string(C);
}QString Widget::eval(){string s=expression.toStdString(),firstnum,secondnum,outcome,option;long long r;for(char c:s){if(c=='+'||c=='-'||c=='*'||c=='/'){option += c;continue;}if(option.size()) secondnum += c;else firstnum += c;}if(secondnum.size()==0) return QString::fromStdString(firstnum);if(option == "+") outcome=Widget::add(firstnum,secondnum);if(option == "-") outcome=Widget::sub(firstnum,secondnum);if(option == "*") outcome=Widget::mul(firstnum,secondnum);if(option == "/") outcome=Widget::div(firstnum,stoll(secondnum),r);return QString::fromStdString(outcome);
}void Widget::on_zeroButton_clicked()
{expression += "0";ui->lineEdit->setText(expression);
}void Widget::on_oneButton_clicked()
{expression += "1";ui->lineEdit->setText(expression);
}void Widget::on_twoButton_clicked()
{expression += "2";ui->lineEdit->setText(expression);
}void Widget::on_threeButton_clicked()
{expression += "3";ui->lineEdit->setText(expression);
}void Widget::on_fourButton_clicked()
{expression += "4";ui->lineEdit->setText(expression);
}void Widget::on_fiveButton_clicked()
{expression += "5";ui->lineEdit->setText(expression);
}void Widget::on_sixButton_clicked()
{expression += "6";ui->lineEdit->setText(expression);
}void Widget::on_sevenButton_clicked()
{expression += "7";ui->lineEdit->setText(expression);
}void Widget::on_eightButton_clicked()
{expression += "8";ui->lineEdit->setText(expression);
}void Widget::on_nineButton_clicked()
{expression += "9";ui->lineEdit->setText(expression);
}void Widget::on_dotButton_clicked()
{expression += ".";ui->lineEdit->setText(expression);
}void Widget::on_addButton_clicked()
{expression = eval() + "+";ui->lineEdit->setText(expression);
}void Widget::on_subButton_clicked()
{expression = eval() + "-";ui->lineEdit->setText(expression);
}void Widget::on_mulButton_clicked()
{expression = eval() + "*";ui->lineEdit->setText(expression);
}void Widget::on_divButton_clicked()
{expression = eval() + "/";ui->lineEdit->setText(expression);
}void Widget::on_CButton_clicked()
{expression.clear();ui->lineEdit->setText(expression);
}void Widget::on_backspaceButton_clicked()
{expression.chop(1);ui->lineEdit->setText(expression);
}void Widget::on_equalButton_clicked()
{expression = eval();ui->lineEdit->setText(expression);
}

calculator_1_zh_CN.ts 文件

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE TS>
<TS version="2.1" language="zh_CN"></TS>

widget 文件