Рандомное число на c++

 #include <iostream> 
#include <random> 
using namespace std; 
using int32_t = int; 
int main() { 
    constexpr int32_t a = 0; 
    constexpr int32_t b = 3; 
    uniform_int_distribution<int32_t> uid(a, b); 
    mt19937 gen{ random_device()() }; 
    size_t n = 20; 
    int32_t value; 
    while (n--) { 
        value = uid(gen); 
        cout << value << '\n'; 
    } 
}