C++随机数

    //随机数(头文件random)
//     auto random = bind(uniform_int_distribution<>{1, 6}, default_random_engine());//需要头文件functional
//     cout << random() << endl;
    struct Random 
    {
        Random(int low, int high) :dist{ low,high } {}
        int operator()()
        {
            return dist(engine);
        }
        uniform_int_distribution<>dist;//分布
        default_random_engine engine;//引擎
    };
    Random r(0, 4);
    vector<int>arr(5);
    for (int i = 0; i < 100; i++)
    {
        ++arr[r()];
    }
    for (int i = 0; i < arr.size(); i++)
    {
        cout << i << "	";
        for (int j = 0; j < arr[i]; j++)
        {
            cout << "*";
        }
        cout << endl;
    }

运行效果: