cpp: vector

 

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// NarcissisticInfo.h : //练习案例：水仙花数 100 - 1000  NarcissisticNumber //案例描述：水仙花数是指一个 3 位数，它的每个位上的数字的 3次幂之和等于它本身 //例如：1 ^ 3 + 5 ^ 3 + 3 ^ 3 = 153 //请利用do...while语句，求出所有3位数中的水仙花数 // 2023年4月5日 涂聚文 Geovin Du edit. // https://mathworld.wolfram.com/NarcissisticNumber.html //   #pragma once #ifndef NARCISSISTICINFO_H #define NARCISSISTICINFO_H   #include <iostream> #include<string.h> #include<math.h>   using namespace std;     /**  * @brief  * \author geovindu.  * \date 20230-4-10  * vs C++ 两种注释方法，可以用如C#的注释方法  */ namespace geovindu {       /**      * @brief 水仙花数 实体类.      */     class NarcissisticInfo     {       private:           string NarcissisticName;           int NarcissisticDigit;                   public:               /// <summary>         ///         /// </summary>         /// <param name="name"></param>         /// <param name="digit"></param>         NarcissisticInfo(string name,int digit)         {             this->NarcissisticName = name;             this->NarcissisticDigit = digit;         }         /// <summary>         ///         /// </summary>         /// <param name="child"></param>         NarcissisticInfo(const NarcissisticInfo& child) {             this->NarcissisticName = child.NarcissisticName;             this->NarcissisticDigit = child.NarcissisticDigit;         }        /*         NarcissisticInfo& operator=(const NarcissisticInfo& child) {//第一个&表明返回值是计算结果的引用，第二个&表明使用c的引用，const表明不会改变c             this->NarcissisticName = child.NarcissisticName;             this->NarcissisticDigit = child.NarcissisticDigit;             return *this;//返回对象的引用（如果是前面不是NarcissisticInfo &而是NarcissisticInfo，那么返回的就是对象的拷贝）         }         */                   /**          * @brief          * .          *          * \param narcissisticName          */         void setNarcissisticName(string narcissisticName)         {             this->NarcissisticName = narcissisticName;         }           /**          * .          *          * \param narcissisticDigit          */         void setNarcissisticDigit(int narcissisticDigit)         {             this->NarcissisticDigit = narcissisticDigit;         }           /// <summary>         ///         /// </summary>         /// <returns></returns>         string getNarcissisticName()         {             return NarcissisticName;         }         /**          * @brief.          *          * \return          */         int getNarcissisticDigit()         {             return NarcissisticDigit;         }           //void ShowInfo();         };         /**      * @brief 水仙花数显示.      *      */     //void NarcissisticInfo::ShowInfo()     //{           //cout << "名称：" << this->getNarcissisticName() << "，水仙花数：" << this->getNarcissisticDigit() << endl;     //}   }         #endif

　　

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// NarcissisticList.h : //练习案例：水仙花数 100 - 1000  NarcissisticList //案例描述：水仙花数是指一个 3 位数，它的每个位上的数字的 3次幂之和等于它本身 //例如：1 ^ 3 + 5 ^ 3 + 3 ^ 3 = 153 //请利用do...while语句，求出所有3位数中的水仙花数// 2023年4月5日 涂聚文 Geovin Du edit. //https://bytes.com/topic/c/answers/434432-how-do-you-return-list-best-practices // //   #pragma once #ifndef NARCISSISTICLIST_H #define NARCISSISTICLIST_H   #include <iostream> #include <string> #include <vector> #include <memory> #include <iostream> #include <string> #include <list>   #include "NarcissisticInfo.h"   /// <summary> /// /// </summary> namespace geovindu {       /**      * @brief  水仙花数集合类.      * 水仙花数集合类.      */     class NarcissisticList     {       private:           list<NarcissisticInfo> NarcissisticInfos;           public:           /**          * @brief.          *          * \param narcissisticInfos          */         void setNarcissisticList(list<NarcissisticInfo> narcissisticInfos)         {             this->NarcissisticInfos = narcissisticInfos;         }         /**          * @brief.          *          * \return          */         list<NarcissisticInfo> getNarcissisticInfo()         {             return NarcissisticInfos;         }         /**          * @brief.          *          * \param narcissisticInfos          */         //NarcissisticList(list<NarcissisticInfo> narcissisticInfos)         //{             //this->NarcissisticInfos = narcissisticInfos;         //}         /**          * @brief.          *          */         void ShowInfo();     };   }     #endif

　　

写一个集合类对象，或是用vector容器处理，就如CSharp一样的返回值。

 

 

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/**      * @brief 水仙花数.      *      * \return 返回实体类集合      */           NarcissisticList NarcissisticNumber::setNarcissisticInfoList()     {         int i = 100;         int min = 100;         int max = 1000;         //int countA = 0;         list<NarcissisticInfo> list;         //NarcissisticInfo info;         NarcissisticList nlist;         do         {             if (NarcissisticCheck(i)) //IsNarcissisticNumber             {                 //cout << "" << i << "是水仙花数" << endl;                 //info.setNarcissisticDigit(i);                 //info.setNarcissisticName("水仙花数");                 NarcissisticInfo info("水仙花数", i);                 list.push_back(info);                   countA++;             }             i++;           } while (i >= min && i < max);           nlist.setNarcissisticList(list);         cout << "实体类操作，水仙花数有【"  << countA << "】个数。" << endl;         return nlist;     }       /// <summary>     /// 水仙花数 vector容器     /// list<NarcissisticInfo> csharp 是这样返回值     /// </summary>     /// <returns>返回对象数组</returns>     vector<NarcissisticInfo> NarcissisticNumber::setNarcissisticInfoVectorList()     {         int i = 100;         int min = 100;         int max = 1000;         //int countA = 0;         vector<NarcissisticInfo> list;         //list<NarcissisticInfo> lists;         //vector<NarcissisticInfo> info;         //NarcissisticList nlist;         do         {             if (NarcissisticCheck(i)) //IsNarcissisticNumber             {                 //cout << "" << i << "是水仙花数" << endl;                 //info.setNarcissisticDigit(i);                 //info.setNarcissisticName("水仙花数");                 //vector<list<NarcissisticInfo>>;                 //vector<NarcissisticInfo> info;                 NarcissisticInfo info("水仙花数", i);                 //lists.push_back(info);                   list.push_back(info);                 countA++;             }             i++;           } while (i >= min && i < max);           //nlist.setNarcissisticList(list);         cout << "vector容器，实体类操作，水仙花数有【" << countA << "】个数。" << endl;         return list;     }

　　

 

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/**      * @brief  水仙花数.      *      * \return      */     NarcissisticList Geovin::getInfo()     {           NarcissisticNumber number;         //NarcissisticInfo info = number.GetNarcissisticInfo("水仙花数", 153);         //NarcissisticInfo info("水仙花数",153);         //         //info.setNarcissisticDigit(39);         //info.setNarcissisticName("");         NarcissisticList infos = number.setNarcissisticInfoList();         for (auto info : infos.getNarcissisticInfo())         {             cout << "实体类返回：" << info.getNarcissisticName() << "水仙花数" << info.getNarcissisticDigit() << endl;         }         cout << "共有个数：" << infos.getNarcissisticInfo().size() << "" << endl;         return infos;     }       /**      * @brief 水仙花数.实体类 vector      * 100至1000内的三位数的水仙花数      */     list<NarcissisticInfo> Geovin::DisplayNarcissicticInfos()     {         NarcissisticNumber number;         list<NarcissisticInfo> infos;         vector<NarcissisticInfo> vecotrlist = number.setNarcissisticInfoVectorList();           //infos = number.setNarcissisticList(); //不能赋值，类集合 list         if (!vecotrlist.empty())         {             for (NarcissisticInfo info : vecotrlist)             {                 cout << "vector操作：" << info.getNarcissisticName() << "，水仙花数：" << info.getNarcissisticDigit() << endl;                 infos.push_back(info);             }         }                   //cout << "水仙花数有【" << number.countA << "】个数。" << endl;         return infos;     }

　　

调用：

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//vector vector容器 list<NarcissisticInfo> dulist = geovin.DisplayNarcissicticInfos(); if (!dulist.empty()) {       for (auto inf : dulist)     {         cout << "vector:"<< inf.getNarcissisticName() << "" << inf.getNarcissisticDigit() << endl;     } }     //水仙花数 100-1000  实体类 //geovin.getInfo(); geovin.getInfo().ShowInfo();   // //geovin.DisplayNarcissicticInfos();   //水仙花数 100-1000 geovin.DisplayNarcissisticNumber();

　　

输出：