（注:由于从未接触软件设计，后端代码也是一塌糊涂，对于一些先进的设计软件也未曾接触，如qt,vs创建MFC文件，故本次作业最大难点在于
如何将已经学习的知识和未接触过的领域结合起来。秉承程序员基本素养，利用一切可以利用的资源（感谢所有开源大佬所做的贡献），如bilibili,
csdn,博客园,github,stack overflow,途中遇到了很多难题,如软件的安装,软件内部的插件和分类,又如程序流程图，visio安装很麻烦，故我用平替网站
https://app.diagrams.net/完成流程图。写代码很麻烦,使用gpt镜像网站是一条捷径。跟纯代码比起来，使用先进专业的软件毫无疑问能大大减少
工作量（虽然都不会使用）。铺天盖地的报错使我眼花缭乱（那些打不败我的，还不如直接打败我）。
1.UI
2.流程图
3.加减乘除牛顿迭代法开平方根代码
1 #define _CRT_SECURE_NO_WARNINGS
2 #include <stdio.h>
3 #include <math.h>
4
5 // 牛顿迭代法计算平方根
6 double squareRoot(double x) {
7 if (x < 0) {
8 printf("Invalid input: The square root of a negative number is undefined.\n");
9 return -1.0;
10 }
11
12 double guess = x;
13 double epsilon = 1e-6; // 设置一个较小的精度
14
15 while (fabs(guess * guess - x) > epsilon) {
16 guess = 0.5 * (guess + x / guess);
17 }
18
19 return guess;
20 }
21
22 int main() {
23 char operation;
24 double num1, num2, result;
25
26 printf("Enter an operation (+, -, *, /, or sqrt): ");
27 scanf(" %c", &operation);
28
29 switch (operation) {
30 case '+':
31 printf("Enter two numbers: ");
32 scanf("%lf %lf", &num1, &num2);
33 result = num1 + num2;
34 break;
35 case '-':
36 printf("Enter two numbers: ");
37 scanf("%lf %lf", &num1, &num2);
38 result = num1 - num2;
39 break;
40 case '*':
41 printf("Enter two numbers: ");
42 scanf("%lf %lf", &num1, &num2);
43 result = num1 * num2;
44 break;
45 case '/':
46 printf("Enter two numbers: ");
47 scanf("%lf %lf", &num1, &num2);
48 if (num2 == 0) {
49 printf("Division by zero is not allowed.\n");
50 return 1; // 返回非零值表示错误
51 }
52 result = num1 / num2;
53 break;
54 case 's':
55 printf("Enter a number for square root: ");
56 scanf("%lf", &num1);
57 result = squareRoot(num1);
58 break;
59 default:
60 printf("Invalid operation.\n");
61 return 1; // 返回非零值表示错误
62 }
63
64 printf("Result: %.6lf\n", result);
65
66 return 0; // 返回零表示成功
67 }
4.使用c++语言基于qt实现软件
项目文件:projectname.pro
1 QT += core gui
2
3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
4
5 CONFIG += c++17
6
7 # You can make your code fail to compile if it uses deprecated APIs.
8 # In order to do so, uncomment the following line.
9 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
10
11 SOURCES += \
12 main.cpp \
13 widget.cpp
14
15 HEADERS += \
16 widget.h
17
18 FORMS += \
19 widget.ui
20
21 # Default rules for deployment.
22 qnx: target.path = /tmp/$${TARGET}/bin
23 else: unix:!android: target.path = /opt/$${TARGET}/bin
24 !isEmpty(target.path): INSTALLS += target
头文件:filename.h
1 #ifndef WIDGET_H
2 #define WIDGET_H
3
4 #include <QWidget>
5
6 QT_BEGIN_NAMESPACE
7 namespace Ui { class Widget; }
8 QT_END_NAMESPACE
9
10 class Widget : public QWidget
11 {
12 Q_OBJECT
13
14 public:
15 Widget(QWidget *parent = nullptr);
16 ~Widget();
17
18 private slots:
19 void on_suma_clicked();
20
21 void on_resta_clicked();
22
23 void on_sqrt_clicked();
24
25 void on_multiplica_clicked();
26
27 void on_divide_clicked();
28
29 private:
30 Ui::Widget *ui;
31 };
32 #endif // WIDGET_H
源文件：main.cpp
1 #include "widget.h"
2
3 #include <QApplication>
4
5 int main(int argc, char *argv[])
6 {
7 QApplication a(argc, argv);
8 a.setStyle("default");
9 Widget w;
10 w.show();
11 return a.exec();
12 }
y源文件：filename.cpp
1 //created by Yisus7u7 in termux
2
3 #include "widget.h"
4 #include "ui_widget.h"
5
6 Widget::Widget(QWidget *parent)
7 : QWidget(parent)
8 , ui(new Ui::Widget)
9 {
10 ui->setupUi(this);
11 setWindowTitle("Simple Calculator");
12 ui->result->setText("0.0");
13 }
14
15 Widget::~Widget()
16 {
17 delete ui;
18 }
19
20
21 void Widget::on_suma_clicked()
22 {
23 ui->result->setText(QString::number(ui->n1->value() + ui->n2->value()));
24 }
25 void Widget::on_resta_clicked()
26 {
27 ui->result->setText(QString::number(ui->n1->value() - ui->n2->value()));
28 }
29
30 void Widget::on_sqrt_clicked()
31 {
32 // 在你的槽函数或事件处理函数中：
33 double numberToCalculateSqrt = ui->n1->value(); // 获取要计算平方根的数值
34 double epsilon = 1e-6; // 设置一个较小的精度
35
36 if (numberToCalculateSqrt < 0) {
37 ui->result->setText("Invalid input: Square root of a negative number is undefined.");
38 } else {
39 double guess = numberToCalculateSqrt; // 初始猜测值
40
41 while (qAbs(guess * guess - numberToCalculateSqrt) > epsilon) {
42 guess = 0.5 * (guess + numberToCalculateSqrt / guess); // 牛顿迭代公式
43 }
44
45 ui->result->setText(QString::number(guess));
46 }
47
48 }
49
50 void Widget::on_multiplica_clicked()
51 {
52 ui->result->setText(QString::number(ui->n1->value() * ui->n2->value()));
53 }
54
55 void Widget::on_divide_clicked()
56 {
57 ui->result->setText(QString::number(ui->n1->value() / ui->n2->value()));
58 }
界面文件：filename.ui
1 <?xml version="1.0" encoding="UTF-8"?> 2 <ui version="4.0"> 3 <class>Widget</class> 4 <widget class="QWidget" name="Widget"> 5 <property name="geometry"> 6 <rect> 7 <x>0</x> 8 <y>0</y> 9 <width>458</width> 10 <height>270</height> 11 </rect> 12 </property> 13 <property name="windowTitle"> 14 <string>Widget</string> 15 </property> 16 <property name="windowIcon"> 17 <iconset theme="accessories-calculator"> 18 <normaloff>.</normaloff>.</iconset> 19 </property> 20 <widget class="QWidget" name="layoutWidget"> 21 <property name="geometry"> 22 <rect> 23 <x>20</x> 24 <y>50</y> 25 <width>428</width> 26 <height>154</height> 27 </rect> 28 </property> 29 <layout class="QVBoxLayout" name="verticalLayout"> 30 <item> 31 <layout class="QGridLayout" name="gridLayout"> 32 <item row="0" column="0"> 33 <widget class="QLabel" name="label"> 34 <property name="text"> 35 <string>Number 1:</string> 36 </property> 37 </widget> 38 </item> 39 <item row="0" column="1"> 40 <widget class="QDoubleSpinBox" name="n1"> 41 <property name="cursor"> 42 <cursorShape>IBeamCursor</cursorShape> 43 </property> 44 <property name="minimum"> 45 <double>-999999999.000000000000000</double> 46 </property> 47 <property name="maximum"> 48 <double>999999999.000000000000000</double> 49 </property> 50 </widget> 51 </item> 52 <item row="1" column="0"> 53 <widget class="QLabel" name="label_2"> 54 <property name="text"> 55 <string>Number 2:</string> 56 </property> 57 </widget> 58 </item> 59 <item row="1" column="1"> 60 <widget class="QDoubleSpinBox" name="n2"> 61 <property name="cursor"> 62 <cursorShape>IBeamCursor</cursorShape> 63 </property> 64 <property name="minimum"> 65 <double>-999999999.000000000000000</double> 66 </property> 67 <property name="maximum"> 68 <double>999999999.000000000000000</double> 69 </property> 70 </widget> 71 </item> 72 </layout> 73 </item> 74 <item> 75 <layout class="QHBoxLayout" name="horizontalLayout"> 76 <item> 77 <widget class="QPushButton" name="suma"> 78 <property name="cursor"> 79 <cursorShape>PointingHandCursor</cursorShape> 80 </property> 81 <property name="text"> 82 <string>+</string> 83 </property> 84 </widget> 85 </item> 86 <item> 87 <widget class="QPushButton" name="resta"> 88 <property name="cursor"> 89 <cursorShape>PointingHandCursor</cursorShape> 90 </property> 91 <property name="text"> 92 <string>-</string> 93 </property> 94 </widget> 95 </item> 96 <item> 97 <widget class="QPushButton" name="sqrt"> 98 <property name="text"> 99 <string>s</string> 100 </property> 101 </widget> 102 </item> 103 <item> 104 <widget class="QPushButton" name="multiplica"> 105 <property name="cursor"> 106 <cursorShape>PointingHandCursor</cursorShape> 107 </property> 108 <property name="text"> 109 <string>x</string> 110 </property> 111 </widget> 112 </item> 113 <item> 114 <widget class="QPushButton" name="divide"> 115 <property name="cursor"> 116 <cursorShape>PointingHandCursor</cursorShape> 117 </property> 118 <property name="text"> 119 <string>÷</string> 120 </property> 121 </widget> 122 </item> 123 </layout> 124 </item> 125 <item> 126 <widget class="QLabel" name="label_3"> 127 <property name="text"> 128 <string>Result:</string> 129 </property> 130 </widget> 131 </item> 132 <item> 133 <widget class="QLabel" name="result"> 134 <property name="cursor"> 135 <cursorShape>WhatsThisCursor</cursorShape> 136 </property> 137 <property name="text"> 138 <string>0</string> 139 </property> 140 </widget> 141 </item> 142 </layout> 143 </widget> 144 </widget> 145 <resources/> 146 <connections/> 147 </ui>
5.测试截图
（1）加法
（2）减法
（3）乘法
（4）除法
（5）开根
标签：Widget,QT,void,guess,c++,ui,result,计算器,num1 From： https://www.cnblogs.com/244-385-205/p/17764520.html