cpp: pointer

 

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// ConsoleStructSimpleApp.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
 
#include <iostream>
#include <fstream>//文件操作
#include <sstream>//int转string
#include <iomanip>//cout格式化输出 setw()
#include <stdlib.h>
#include "GeovinDu.h"
 
 
using namespace std;
using namespace DuStructSimple;
 
 
//#pragma pack(2)
/// <summary>
///
/// </summary>
enum weekdayname
{
 
    /// <summary>
    ///
    /// </summary>
    SUN=1,
    /// <summary>
    ///
    /// </summary>
    MON=2,
    /// <summary>
    ///
    /// </summary>
    TUE=3,
    /// <summary>
    ///
    /// </summary>
    WED=4,
    /// <summary>
    ///
    /// </summary>
    THU=5,
    /// <summary>
    ///
    /// </summary>
    FRI=6,
    /// <summary>
    ///
    /// </summary>
    SAT=7
 
};
 
/// <summary>
///
/// </summary>
enum color
{
    red = 5,
    blue,
    green
};
 
union person
{
    int age;
    char name[256];
    char sex[2];
 
};
 
union person2
{
    int age;
    char name;
    char sex;
 
}du;
 
 
void func(int** pp)
{
    *pp= new int(3);
    //*pp = 40;
    cout << "pp=" << pp << ",*pp=" << *pp <<",**pp=" << **pp<< endl;
 
}
 
void func2(int* pp)
{
    *pp = 3;
    cout << "pp2=" << pp << ",*pp2=" << *pp << endl;
 
}
 
int main()
{
 
    int* dup=0;
    func(&dup);
    cout << "p==" << dup << ",*p==" << *dup << endl;
    //2
    cout << "**************2*************" << endl;
    int dup2 = 1;
    func2(&dup2);
    cout << "p2==" << dup << ",&p2==" << &dup << endl;
 
    int a = 10;
    cout << "&a=" << &a << endl;
    int* p = &a;
    cout << "p=" << p <<",&p="<<&p<<",*p="<<*p << endl;
    int** j = &p;
    cout << "j=" << j << ",&j=" << &j << endl;
    cout << "*j=" << *j << endl;
    cout<<",**j="<<**j<< endl;
 
 
    //person per;
    //per.age = 30;
    ////per.name = "g";
    ////per.sex = "m";
 
    //cout << "person内存：" << sizeof(person) << endl;
    //cout << "person2 内存：" << sizeof(person2) << endl;
 
 
    //cout << "person sex内存 " << sizeof(per.sex) << endl;
 
    //cout << "person2 sex内存 " << sizeof(du.sex) << endl;
    ////地址相同：
    //cout << "per.name=" << &per.name << endl;
    //cout << "per.age=" << &per.age << endl;
    //cout << "per=" << &per << endl;
 
   // std::cout << "Hello World!涂聚文 Geovin Du\n";
 
    //int num;
    //cout << "输入5-7(红，蓝，绿）:" << endl;
    //cin >> num;
    //switch (num)
    //{
    //case 5:
    //  cout << "红色" << endl;
    //  break;
    //case 6:
    //  cout << "蓝色" << endl;
    //  break;
    //case 7:
    //  cout << "绿色" << endl;
    //  break;
    //default:
    //  cout << "错误！" << endl;
    //  break;
    //}
 
 
    //cout << "枚举类型：" << endl;
    //cout << SUN <<","<<MON<<","<<TUE<<"," << WED <<","<<THU<<","<<FRI<<","<<SAT<< endl;
 
    //enum weekdayname day;
    //day = FRI;
    //cout << day << endl;
 
    //GeovinDu geovin;
 
    //
    //geovin.DisplayStructSize();
 
    //geovin.displayStudent();
    // 无用
    //geovin.dispalyStructDemo();
    //
    //
    //geovin.dsipalyFuntion();
 
    //geovin.dipslayStructCustomer();
 
    system("pause");
    return 0;
 
}
 
// 运行程序: Ctrl + F5 或调试 >“开始执行(不调试)”菜单
// 调试程序: F5 或调试 >“开始调试”菜单
 
// 入门使用技巧:
//   1. 使用解决方案资源管理器窗口添加/管理文件
//   2. 使用团队资源管理器窗口连接到源代码管理
//   3. 使用输出窗口查看生成输出和其他消息
//   4. 使用错误列表窗口查看错误
//   5. 转到“项目”>“添加新项”以创建新的代码文件，或转到“项目”>“添加现有项”以将现有代码文件添加到项目
//   6. 将来，若要再次打开此项目，请转到“文件”>“打开”>“项目”并选择 .sln 文件

　　

 

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// ConsoleStructSimpleApp.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
 
#include <iostream>
#include <fstream>//文件操作
#include <sstream>//int转string
#include <iomanip>//cout格式化输出 setw()
#include <stdlib.h>
#include "GeovinDu.h"
 
 
using namespace std;
using namespace DuStructSimple;
 
 
//#pragma pack(2)
/// <summary>
///
/// </summary>
enum weekdayname
{
 
    /// <summary>
    ///
    /// </summary>
    SUN=1,
    /// <summary>
    ///
    /// </summary>
    MON=2,
    /// <summary>
    ///
    /// </summary>
    TUE=3,
    /// <summary>
    ///
    /// </summary>
    WED=4,
    /// <summary>
    ///
    /// </summary>
    THU=5,
    /// <summary>
    ///
    /// </summary>
    FRI=6,
    /// <summary>
    ///
    /// </summary>
    SAT=7
 
};
 
/// <summary>
///
/// </summary>
enum color
{
    red = 5,
    blue,
    green
};
 
union person
{
    int age;
    char name[256];
    char sex[2];
 
};
 
union person2
{
    int age;
    char name;
    char sex;
 
}du;
 
/// <summary>
/// 二级指针
/// </summary>
/// <param name="pp">形参</param>
void func(int** pp)
{
    int* p = 0;
    int** dup = &p;
    *dup = new int(3);
 
    cout << "&pp=" << &pp << endl;
    cout << "*pp=" << *pp << endl;
    cout << "**pp=" << **pp << endl;
 
    *pp= new int(3);
    //*pp = 40;
    cout << "pp=" << pp << ",*pp=" << *pp <<",**pp=" << **pp<<",&pp="<<&pp<< endl;
 
    //*pp指向p, pp指向new, &pp指向自已
 
}
/// <summary>
///
/// </summary>
/// <param name="pp"></param>
void func2(int* pp)
{
    *pp = 3;
    cout << "pp2=" << pp << ",*pp2=" << *pp << endl;
 
}
 
int main()
{
 
    //int* dup=0;
    //func(&dup);
    //cout << "p==" << dup << ",*p==" << *dup << endl;
    //2
    cout << "**************2*************" << endl;
    int dup2 = 10;
    cout << "dup2=" << &dup2 << endl;
    int* dupp = &dup2;
    cout << "dupp=" << &dupp << endl;
    func(&dupp);
    cout << "p2==" << dupp << ",&p2==" << &dupp <<",*dupp="<<*dupp << endl;
 
    //3
    cout << "3***********" << endl;
    int kk = 20;
    int* dukk = &kk;
    func2(dukk);
 
    cout << "4************" << endl;
 
    int a = 10;
    cout << "&a=" << &a << endl;
    int* p = &a;
    cout << "p=" << p <<",&p="<<&p<<",*p="<<*p << endl;
    int** j = &p;
    cout << "j=" << j << ",&j=" << &j << endl;
    cout << "*j=" << *j << endl;
    cout<<",**j="<<**j<< endl;
 
 
    //person per;
    //per.age = 30;
    ////per.name = "g";
    ////per.sex = "m";
 
    //cout << "person内存：" << sizeof(person) << endl;
    //cout << "person2 内存：" << sizeof(person2) << endl;
 
 
    //cout << "person sex内存 " << sizeof(per.sex) << endl;
 
    //cout << "person2 sex内存 " << sizeof(du.sex) << endl;
    ////地址相同：
    //cout << "per.name=" << &per.name << endl;
    //cout << "per.age=" << &per.age << endl;
    //cout << "per=" << &per << endl;
 
   // std::cout << "Hello World!涂聚文 Geovin Du\n";
 
    //int num;
    //cout << "输入5-7(红，蓝，绿）:" << endl;
    //cin >> num;
    //switch (num)
    //{
    //case 5:
    //  cout << "红色" << endl;
    //  break;
    //case 6:
    //  cout << "蓝色" << endl;
    //  break;
    //case 7:
    //  cout << "绿色" << endl;
    //  break;
    //default:
    //  cout << "错误！" << endl;
    //  break;
    //}
 
 
    //cout << "枚举类型：" << endl;
    //cout << SUN <<","<<MON<<","<<TUE<<"," << WED <<","<<THU<<","<<FRI<<","<<SAT<< endl;
 
    //enum weekdayname day;
    //day = FRI;
    //cout << day << endl;
 
    //GeovinDu geovin;
 
    //
    //geovin.DisplayStructSize();
 
    //geovin.displayStudent();
    // 无用
    //geovin.dispalyStructDemo();
    //
    //
    //geovin.dsipalyFuntion();
 
    //geovin.dipslayStructCustomer();
 
    system("pause");
    return 0;
 
}
 
// 运行程序: Ctrl + F5 或调试 >“开始执行(不调试)”菜单
// 调试程序: F5 或调试 >“开始调试”菜单
 
// 入门使用技巧:
//   1. 使用解决方案资源管理器窗口添加/管理文件
//   2. 使用团队资源管理器窗口连接到源代码管理
//   3. 使用输出窗口查看生成输出和其他消息
//   4. 使用错误列表窗口查看错误
//   5. 转到“项目”>“添加新项”以创建新的代码文件，或转到“项目”>“添加现有项”以将现有代码文件添加到项目
//   6. 将来，若要再次打开此项目，请转到“文件”>“打开”>“项目”并选择 .sln 文件

　　

 

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/// <summary>
/// 指针
/// </summary>
/// <param name="pp">形参</param>
void func3(int* pp)
{
    int* p = 0;
    int** dup = &p;
    *dup = new int(3);
 
    cout << "&pp=" << &pp << endl;
    cout << "*pp=" << *pp << endl;
    //cout << "**pp=" << **pp << endl;
 
    pp = new int(3);
    //*pp = new int(3);
    //*pp = 40;
    //cout << "pp=" << pp << ",*pp=" << *pp << ",**pp=" << **pp << ",&pp=" << &pp << endl;
    cout << "pp=" << pp << ",*pp=" << *pp << ",&pp=" << &pp << endl;
    //*pp指向p, pp指向new, &pp指向自已
 
}

　　

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/// <summary>
/// 二级指针
/// </summary>
/// <param name="pp">形参</param>
int func(int** pp)
{
    int* p = 0;
    int** dup = &p;
    *dup = new int(3);
 
    cout << "&pp=" << &pp << endl;
    cout << "*pp=" << *pp << endl;
    cout << "**pp=" << **pp << endl;
 
    *pp= new int(3);
    //*pp = 40;
    cout << "pp=" << pp << ",*pp=" << *pp <<",**pp=" << **pp<<",&pp="<<&pp<< endl;
 
    //*pp指向p, pp指向new, &pp指向自已
    return **pp;
 
}
/// <summary>
/// 指针
/// </summary>
/// <param name="pp">形参</param>
int func3(int* pp)
{
    int* p = 0;
    int** dup = &p;
    *dup = new int(3);
 
    cout << "&pp=" << &pp << endl;
    cout << "*pp=" << *pp << endl;
    //cout << "**pp=" << **pp << endl;
 
    pp = new int(3);
    //*pp = new int(3);
    //*pp = 40;
    //cout << "pp=" << pp << ",*pp=" << *pp << ",**pp=" << **pp << ",&pp=" << &pp << endl;
    cout << "pp=" << pp << ",*pp=" << *pp << ",&pp=" << &pp << endl;
    //*pp指向p, pp指向new, &pp指向自已
 
    return *pp;
 
}
/// <summary>
///
/// </summary>
/// <param name="pp"></param>
int func2(int* pp)
{
    *pp = 3;
    cout << "pp2=" << pp << ",*pp2=" << *pp << endl;
    return *pp;
 
}

　　

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// ManageStudent.h: 此文件包含 "ManageStudent" 类。当作视图式结构体 策略模式  Strategy Pattern C++ 14
// 2023年5月1日 涂聚文 Geovin Du Visual Studio 2022 edit.
 
#pragma once
#ifndef HEROSIMPLE_H
#define HEROSIMPLE_H
 
#include<cstring>
#include<stdbool.h>
#include<stdlib.h>
#include<iostream>
#include<malloc.h>
#include<cmath>
#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
#include <array>
#include <functional>
#include <list>
#include <string>
#include <string.h>
 
using namespace std;
 
 
namespace DuStructSimple
{
 
 
 
    /// <summary>
    ///
    /// </summary>
    struct hero
    {
 
        /// <summary>
        ///
        /// </summary>
        string name;
        /// <summary>
        ///
        /// </summary>
        int age;
        /// <summary>
        ///
        /// </summary>
        float HealthPoint;
        /// <summary>
        ///
        /// </summary>
        long property;
        /// <summary>
        ///
        /// </summary>
        string sex;
 
        /// <summary>
        ///
        /// </summary>
        /// <param name="Obj"></param>
        /// <returns></returns>
        bool operator<(const hero& Obj) const
        {
            return HealthPoint < Obj.HealthPoint;
        }
 
    };
    /// <summary>
    ///
    /// </summary>
    /// <param name="arr"></param>
    /// <param name="len"></param>
    void bubbleSort(hero arr[], int len)
    {
        for (int i = 0; i < len - 1; i++)
        {
            for (int j = 0; j < len - 1 - i; j++)
            {
                if (arr[j].age > arr[j + 1].age)
                {
                    hero temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }
        }
    }
    /// <summary>
    ///
    /// </summary>
    /// <param name="a"></param>
    /// <param name="b"></param>
    /// <returns></returns>
    bool compareTwohero(hero a, hero b)
    {
        // If total marks are not same then
        // returns true for higher total
        if (a.HealthPoint != b.HealthPoint)
            return a.HealthPoint > b.HealthPoint;
 
        // If marks in Maths are same then
        // returns true for higher marks
        if (a.property != b.property)
            return a.property > b.property;
 
        return (a.age > b.age);
    }
 
 
}
 
#endif
 
 /// <summary>
    /// 英雄显示示例
    /// </summary>
    void GeovinDu::displayHero()
    {
 
        cout << "英雄年龄排序：" << endl;
        hero rosdu[5] = { {"赵二",23,100,50,"男"},{"李三",28,105,70,"男"},{"王四",26,120,40,"男"},{"刘英",21,90,80,"女"},{"何五",20,130,78,"男"} };
        vector<hero> ros = { {"赵二",23,100,50,"男"},{"李三",28,105,70,"男"},{"王四",26,120,40,"男"},{"刘英",21,90,80,"女"},{"何五",20,130,78,"男"} };
        bubbleSort(rosdu, 5);
        cout << "\t姓名" << "\t生命值" << "\t财点" << "\t年龄" << "\t性别" << endl;
        for (auto du : rosdu)
        {
            cout << "\t" << du.name << "\t" << du.HealthPoint << "\t" << du.property << "\t" << du.age<<"\t"<<du.sex << endl;
        }
        cout << "英雄生命点排序：" << endl;
        sort(ros.begin(), ros.end(), compareTwohero);
        cout << "\t姓名" << "\t生命值" << "\t财点" << "\t年龄" << "\t性别" << endl;
        for (auto du : ros)
        {
            cout << "\t" << du.name << "\t" << du.HealthPoint << "\t" << du.property << "\t" << du.age << "\t" << du.sex << endl;
        }
 
        cout << "英雄财点排序：" << endl;
        // Using lambda expressions in C++11
        sort(ros.begin(), ros.end(), [](const hero& lhs, const hero& rhs) {
            return lhs.property < rhs.property;
            });;
        cout << "\t姓名" << "\t生命值" << "\t财点" << "\t年龄" << "\t性别" << endl;
        for (auto du : ros)
        {
            cout << "\t" << du.name << "\t" << du.HealthPoint << "\t" << du.property << "\t" << du.age << "\t" << du.sex << endl;
        }
 
 
    }

　　

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// hero.h: 此文件包含 "hero" 类。当作视图式结构体 策略模式  Strategy Pattern C++ 14
// 2023年5月1日 涂聚文 Geovin Du Visual Studio 2022 edit.
 
#pragma once
#ifndef HEROSIMPLE_H
#define HEROSIMPLE_H
 
#include<cstring>
#include<stdbool.h>
#include<stdlib.h>
#include<iostream>
#include<malloc.h>
#include<cmath>
#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
#include <array>
#include <functional>
#include <list>
#include <string>
#include <string.h>
 
using namespace std;
 
 
namespace DuStructSimple
{
 
 
 
    /// <summary>
    ///
    /// </summary>
    struct hero
    {
 
        /// <summary>
        ///
        /// </summary>
        string name;
        /// <summary>
        ///
        /// </summary>
        int age;
        /// <summary>
        ///
        /// </summary>
        float HealthPoint;
        /// <summary>
        ///
        /// </summary>
        long property;
        /// <summary>
        ///
        /// </summary>
        string sex;
 
        /// <summary>
        ///
        /// </summary>
        /// <param name="Obj"></param>
        /// <returns></returns>
        bool operator<(const hero& Obj) const
        {
            return HealthPoint < Obj.HealthPoint;
        }
 
    };
    /// <summary>
    /// 年龄排序
    /// </summary>
    /// <param name="arr"></param>
    /// <param name="len"></param>
    void bubbleAgeSort(hero arr[], int len)
    {
        for (int i = 0; i < len - 1; i++)
        {
            for (int j = 0; j < len - 1 - i; j++)
            {
                if (arr[j].age > arr[j + 1].age)
                {
                    hero temp = arr[j];//替换值
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }
        }
    }
    /// <summary>
    /// 容器生命点排序
    /// </summary>
    /// <param name="query"></param>
    void bubbleHealthPointSort(vector<hero>& query) {
        int n = query.size();//;
        for (int i = 0; i < n - 1; i++) {
            for (int j = 0; j < n - i - 1; j++) {
                if (query[j].HealthPoint > query[j + 1].HealthPoint) {
                    swap(query[j], query[j + 1]);
                }
            }
        }
    }
 
 
    /// <summary>
    ///
    /// </summary>
    /// <param name="a"></param>
    /// <param name="b"></param>
    /// <returns></returns>
    bool compareTwohero(hero a, hero b)
    {
        // If total marks are not same then
        // returns true for higher total
        if (a.HealthPoint != b.HealthPoint)
            return a.HealthPoint > b.HealthPoint;
 
        // If marks in Maths are same then
        // returns true for higher marks
        if (a.property != b.property)
            return a.property > b.property;
 
        return (a.age > b.age);
    }
 
 
}
 
#endif

　　

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/// <summary>
   /// 英雄显示示例
   /// </summary>
   void GeovinDu::displayHero()
   {
 
        
       hero rosdu[5] = { {"赵二",23,100,50,"男"},{"李三",28,105,70,"男"},{"王四",26,120,40,"男"},{"刘英",21,90,80,"女"},{"何五",20,130,78,"男"} };
       vector<hero> ros = { {"赵二",23,100,50,"男"},{"Geovin Du",28,105,70,"男"},{"涂聚文",26,120,40,"男"},{"刘英",21,90,80,"女"},{"何五",20,130,78,"男"} };
       //1种冒泡排序
       cout << "英雄年龄冒泡排序：" << endl;
       bubbleAgeSort(rosdu, 5);
       cout << "\t姓名" << "\t生命值" << "\t财点" << "\t年龄" << "\t性别" << endl;
       for (auto du : rosdu)
       {
           cout << "\t" << du.name << "\t" << du.HealthPoint << "\t" << du.property << "\t" << du.age<<"\t"<<du.sex << endl;
       }
       cout << "英雄生命点排序：" << endl;
       //2种排序
       sort(ros.begin(), ros.end(), compareTwohero);
       cout << "\t姓名" << "\t生命值" << "\t财点" << "\t年龄" << "\t性别" << endl;
       for (auto du : ros)
       {
           cout << "\t" << du.name << "\t" << du.HealthPoint << "\t" << du.property << "\t" << du.age << "\t" << du.sex << endl;
       }
       
       cout << "英雄生命点容器冒泡排序：" << endl;
       //3容器冒泡种排序
        
       bubbleHealthPointSort(ros);
       cout << "\t姓名" << "\t生命值" << "\t财点" << "\t年龄" << "\t性别" << endl;
       for (auto du : ros)
       {
           cout << "\t" << du.name << "\t" << du.HealthPoint << "\t" << du.property << "\t" << du.age << "\t" << du.sex << endl;
       }
       cout << "英雄财点排序：" << endl;
       //4种排序
       // Using lambda expressions in C++11
       sort(ros.begin(), ros.end(), [](const hero& lhs, const hero& rhs) {
           return lhs.property < rhs.property;
           });;
       cout << "\t姓名" << "\t生命值" << "\t财点" << "\t年龄" << "\t性别" << endl;
       for (auto du : ros)
       {
           cout << "\t" << du.name << "\t" << du.HealthPoint << "\t" << du.property << "\t" << du.age << "\t" << du.sex << endl;
       }
 
 
   }

　　

 

 

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