c++ random element from vector code example

Example 1: create random vectors c++

#include <random>
#include <algorithm>
#include <iterator>
#include <iostream>
#include <functional>

using namespace std;

int main()
{
    // First create an instance of an engine.
    random_device rnd_device;
    // Specify the engine and distribution.
    mt19937 mersenne_engine {rnd_device()};  // Generates random integers
    uniform_int_distribution<int> dist {1, 52};

    auto gen = [&dist, &mersenne_engine](){
                   return dist(mersenne_engine);
               };

    vector<int> vec(10);
    generate(begin(vec), end(vec), gen);

    // Optional
    for (auto i : vec) {
        cout << i << " ";
    }


}

Example 2: select one random element of a vector in c++

vector<int> v{10,21,24,13};

int random = rand() % v.size();
int sel_elem = v[random];

cout<<"Selected Element: "<<sel_elem<<endl;