把上面代码变成c++

将给定的Python代码转换成C++代码，我们需要保留基本结构并适应C++语法。以下是转换后的版本：

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <ctime>
#include <cstdlib>

std::vector<std::string> generatePrizes(int numRounds) {
    std::vector<std::string> prizes;
    for (int i = 1; i <= 3; ++i) {
        prizes.push_back(std::to_string(i));
    }
    std::sort(prizes.begin(), prizes.end());

    return prizes;
}

void drawLottery(std::vector<std::string>& prizes) {
    srand(time(0)); // 设置随机数种子
    int totalRounds = 15;
    for (int i = 0; i <= totalRounds; ++i) {
        double percent = static_cast<double>(i) / totalRounds * 100.0; // 计算进度百分比
        std::cout << "\rLoading progress: " << percent << "% (" << std::fixed << std::setprecision(2) << "%%)" << ' ', std::flush;
        if (i % 10 == 0) {
            std::this_thread::sleep_for(std::chrono::milliseconds(100)); // 每10秒打印一次
        }
    }

    std::string prize;
    do {
        prize = prizes.back(); // 随机抽取奖品
        prizes.pop_back();
    } while (prize.empty()); // 确保奖品不为空

    std::cout << "\nDraw completed!\nYour prize is number " << prize << "!" << std::endl;
}

int main() {
    const int MAX_ROUNDS = 10; // 用户最多可以输入的抽奖次数，这里设为10次循环
    for (int round = 1; round <= MAX_ROUNDS; ++round) {
        std::vector<std::string> prizes = generatePrizes(15);
        drawLottery(prizes);
    }

    return 0;
}

这个C++代码实现了与原始Python代码类似的功能，包括生成奖品、抽奖流程以及控制循环次数。注意，C++的`<thread>`库用于模拟暂停效果，而`<vector>`和`<algorithm>`库用于操作动态数组。