03-random.cpp

#include<iostream>
#include<random>
#include<chrono>
#include<vector>
#include<string>
int main(int argc, char**agrv) {
	auto seed =  std::chrono::steady_clock::now().time_since_epoch().count();
	std::default_random_engine eng(seed);
	std::cout << eng()<<std::endl;
	std::uniform_int_distribution<int> distr(0, 10);
	std::cout << distr(eng)<<"\n";
	std::uniform_real_distribution<double> distR(0, 10);
	std::cout << distR(eng) << "\n";
	std::poisson_distribution<int> distP(1.0); //mean
	std::cout << distP(eng) << "\n";
	std::cout << "normal distribution" << std::endl;
	std::normal_distribution<double> distN(10.0, 6.0);
	std::vector<int> v(20);
	for (int i = 0; i < 800; i++) {
		int num = distN(eng);
		if (num >= 0 && num < 20)
			v[num]++;
	}
	for (int i = 0; i < 20; i++) {
		std::cout << i << ":" << std::string(v[i], '*') << std::endl;
	}
	std::cin.get();
	return 0;
}
//g++ -std=c++11 -o random.exe 03-random.cpp