std::mt19937
#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
#include <cmath>
int main()
{
// 以随机值播种,若可能
std::random_device r;
// 选择 1 与 6 间的随机数
std::default_random_engine e1(r());
std::uniform_int_distribution<int> uniform_dist(1, 6);
int mean = uniform_dist(e1);
std::cout << "Randomly-chosen mean: " << mean << '\n';
// 生成围绕平均值的正态分布
std::seed_seq seed2{r(), r(), r(), r(), r(), r(), r(), r()};
std::mt19937 e2(seed2);
std::normal_distribution<> normal_dist(mean, 2);
std::map<int, int> hist;
for (int n = 0; n < 10000; ++n) {
++hist[std::round(normal_dist(e2))];
}
std::cout << "Normal distribution around " << mean << ":\n";
for (auto p : hist) {
std::cout << std::fixed << std::setprecision(1) << std::setw(2)
<< p.first << ' ' << std::string(p.second/200, '*') << '\n';
}
}
https://zh.cppreference/w/cpp/numeric/random
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