Question

我试图随机生成5个字符串，看起来像“A1，B3，C7，D2，I8”，没有重复。最终结果应该是一个工作函数，它给我一个容易面对的字母和数字。这是我所做的功能，顺便说一下这个功能的问题它只给我数字。

using namespace std;

char letters[]= {'A','B','C','D','E','F','G','H','I','L'};
int Num[11];
char pGuess[10];
string generateSetOfNumbers()
{
    int G = rand() % 10;
    int nOut = rand() % 10 + 1;
    char lOut = letters[G];
    int Max = 5;
    int Min = 0;
    string culo =  lOut + to_string(nOut);
    {
        int G = rand() % 10;
        int nOut = rand() % 10 + 1;
        char lOut = letters[G];
        int Max = 5;
        int Min = 0;
        string culo1 =  lOut + to_string(nOut);
        return culo1;
    }
    {
        int G = rand() % 10;
        int nOut = rand() % 10 + 1;
        char lOut = letters[G];
        int Max = 5;
        int Min = 0;
        string culo2 =  lOut + to_string(nOut);
        return culo2;
    }
    {
        int G = rand() % 10;
        int nOut = rand() % 10 + 1;
        char lOut = letters[G];
        int Max = 5;
        int Min = 0;
        string culo3 =  lOut + to_string(nOut);
        return culo3;
    }
    {
        int G = rand() % 10;
        int nOut = rand() % 10 + 1;
        char lOut = letters[G];
        int Max = 5;
        int Min = 0;
        string culo4 =  lOut + to_string(nOut);
        return culo4;
    }
}

Answer 1

这些代码块没用。你的功能总是在这里返回：

string culo =  lOut + to_string(nOut);
{
    int G = rand() % 10;
    int nOut = rand() % 10 + 1;
    char lOut = letters[G];
    int Max = 5;
    int Min = 0;
    string culo1 =  lOut + to_string(nOut);
    return culo1;  // function returns, no further execution
}

您是否要使用if() else if()级联检查某些条件以有条件地执行这些代码块？

Answer 2

这是实现你想要的一种方式：

#include <vector>
#include <string>
#include <iostream>
#include <algorithm>
#include <random>

// build an array of strings A1-9 to I1-9
// then shuffle it randomly (like a deck of cards)
std::vector<std::string> make_candidates()
{
    // this builds the array
    std::vector<std::string> result;

    // for each number 1 to 9...
    for(int i = 1 ; i < 10 ; ++i)
    {
        // for each letter A to I...
        for(char c = 'A' ; c < 'J' ; ++c) {
            // build a string of Letter, Number and push it to the
            // top of the 'deck'
            char s[2] = { c, char('0' + char(i)) };
            result.emplace_back(std::begin(s), std::end(s));
        }
    }

    // random device delivers true random numbers (on most systems)        
    std::random_device rd {};

    // make a pseudo-random engine, seeded with a real random number
    auto eng = std::default_random_engine(rd());

    // use the engine to shuffle our 'deck' of results
    std::shuffle(std::begin(result), std::end(result), eng);

    return result;
}

// pull the last string off the given 'deck'    
std::string next_candidate(std::vector<std::string>& candidates)
{
    auto result = std::move(candidates.back());
    candidates.pop_back();
    return result;
}

int main()
{
    // make a shuffled 'deck' of 'cards' from A1 to I9, but in
    // random order
    std::vector<std::string> candidates = make_candidates();

    // pick the top 5 and print them    
    std::cout << next_candidate(candidates) << std::endl;
    std::cout << next_candidate(candidates) << std::endl;
    std::cout << next_candidate(candidates) << std::endl;
    std::cout << next_candidate(candidates) << std::endl;
    std::cout << next_candidate(candidates) << std::endl;
    return 0;
}

示例输出：

F6
F4
I3
F3
G9

生成伪随机数和不重复的字母

2 个答案: