cpp: random

 

 

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// RandomlySampled.h : 此文件包含 "RandomlySampled" 类。十个常用排序算法 C++ 11 // 2023年4月9日 涂聚文 Geovin Du edit.       #pragma once #ifndef RANDOMLYSAMPLED_H #define RANDOMLYSAMPLED_H   #include <iostream> #include <string> #include <vector> #include <memory> #include <iostream> #include <string> #include <ctime> #include <cstdlib> #include <list>         using namespace std;     namespace geovindu {     /**     *@brief 指定字符组数组，指定抽取一个或几个     *     */     class RandomlySampled     {       private:         string bundles[3];         const string choices[6];         string random;       public:           RandomlySampled();           string getBundles()         {             return bundles[3];         }         void setBundles(string b);           vector<string> randomize();           vector<string> randomize(int choiceNumber);           vector<string> randomize(int choiceNumber, string choices[]);           vector<string> randomizes(int choiceNumber, std::list<std::string> choices);     };         RandomlySampled::RandomlySampled()         :choices{ "" }, bundles{ "" }     {       }     /**     * @brief 指定字符组数组，指定抽取一个或几个     *     */     vector<string> RandomlySampled::randomize()     {         srand(time(0));         string choices[] = { "Broccoli", "SiboDu", "Kiwi", "Kale", "Toma","GeovinDu" };         int number = size(choices);         vector<string> random;         for (int i = 0; i < 1; i++) //1是一个，3是三个，需要抽取的数量         {             random.push_back(choices[rand() % number]); //数组的个数         }         return random;     }       /**     * @brief 指定字符组数组，指定抽取一个或几个     * @param [int] 输入参数     */     vector<string> RandomlySampled::randomize(int choiceNumber)     {         srand(time(0));         string choices[] = { "Broccoli", "SiboDu", "Kiwi", "Kale", "Toma","GeovinDu" };         int number = size(choices);         vector<string> random;         for (int i = 0; i < choiceNumber; i++) //1是一个，3是三个，需要抽取的数量         {             random.push_back(choices[rand() % number]); //数组的个数         }         return random;     }       /**     * @brief 指定字符组数组，指定抽取一个或几个     * @param [int] 输入参数 指定抽取的几个个数     * @param [string choices[]] 输入参数 字符串数组，需要从中抽取的数组     */     vector<string> RandomlySampled::randomize(int choiceNumber, string choices[])     {         srand(time(0));                      int number = sizeof(choices);         vector<string> random;         for (int i = 0; i < choiceNumber; i++) //1是一个，3是三个，需要抽取的数量         {             random.push_back(choices[rand() % number]); //数组的个数         }         return random;     }     /**     * @brief 指定字符组数组，指定抽取一个或几个     * @param [int] 输入参数 指定抽取的几个个数     * @param [list<string>] 输入参数 字符串数组，需要从中抽取的数组     */     vector<string> RandomlySampled::randomizes(int choiceNumber, std::list<std::string> choices)     {         srand(time(0));         int number = choices.size();         vector<string> random;         for (int i = 0; i < choiceNumber; i++) //1是一个，3是三个，需要抽取的数量         {             std::list<std::string>::iterator du = choices.begin();            // random.push_back(choices[rand() % number]); //数组的个数             //1 ok             std::advance(du, rand() % number);             string  ss = *du;             //2 也可以             //auto du1 = std::next(choices.begin(), rand() % number);             //ss = *du1;                random.push_back(ss);         }         return random;     } };     #endif

　　

 

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/**      # @brief 抽取指定字符串数组的字符     */     void Geovin::DisplayRomd()     {         srand(time(0));           RandomlySampled bo;         bo.randomize();         //auto         vector<string> randomResult = bo.randomize();         for (const auto& result : randomResult) {             cout << "中奖人姓名:" << result << endl;         }     }         /**      * @brief 抽取指定字符串数组的字符        * @param [long] 输入参数  抽几个人中奖     */     void Geovin::DisplayRomd(int number)     {         srand(time(0));         std::list<std::string> choices = { "涂聚文","刘杰","江山","徐工","李四","王五","张三","赵二"};         RandomlySampled bo;           bo.randomizes(number,choices);         //auto         vector<string> randomResult = bo.randomizes(number,choices);         for (const auto& result : randomResult) {             cout <<"中奖人姓名:"<< result << endl;         }     }     /**      * @brief 抽取指定字符串数组的字符      * @param [long] 输入参数  抽几个人中奖      * @param [list<string>] 输入参数 字符串数组，需要从中抽取的数组     */     void Geovin::DisplayRomd(int number, std::list<std::string> choices)     {         srand(time(0));         //std::list<std::string> choices = { "涂聚文","刘杰","江山","徐工","李四","王五","张三","赵二" };         RandomlySampled bo;           bo.randomizes(number, choices);         //auto         vector<string> randomResult = bo.randomizes(number, choices);         for (const auto& result : randomResult) {             cout << "中奖人姓名:" << result << endl;         }     }

　　

调用：

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//随机抽取字符串 //geovin.DisplayRomd();   //geovin.DisplayRomd(1);   std::list<std::string> choices = { "涂聚文","刘杰","江山","徐工","李四","王五","张三","赵二" }; geovin.DisplayRomd(1, choices);