编辑“︁C++ 随机数函数”︁（章节）

== 实际应用案例 ==
=== 案例1：蒙特卡洛模拟 ===
估算π值：
<syntaxhighlight lang="cpp">
#include <iostream>
#include <random>
#include <cmath>

double estimate_pi(int samples) {
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_real_distribution<> dis(0.0, 1.0);

    int hits = 0;
    for (int i = 0; i < samples; ++i) {
        double x = dis(gen);
        double y = dis(gen);
        if (x*x + y*y <= 1) hits++;
    }
    return 4.0 * hits / samples;
}

int main() {
    std::cout << "π ≈ " << estimate_pi(1000000) << '\n';
}
</syntaxhighlight>

=== 案例2：密码生成器 ===
<syntaxhighlight lang="cpp">
#include <iostream>
#include <random>
#include <string>
#include <algorithm>

std::string generate_password(size_t length) {
    const std::string chars =
        "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dis(0, chars.size() - 1);

    std::string password;
    std::generate_n(std::back_inserter(password), length, 
        [&](){ return chars[dis(gen)]; });
    
    return password;
}

int main() {
    std::cout << "生成密码: " << generate_password(12) << '\n';
}
</syntaxhighlight>