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Random numbers in C++11

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Submitted on: 3/22/2020 9:50:56 AM
By: Thomas1965 
Level: Beginner
User Rating: Unrated
Compatibility: C++ (general)
Views: 700
 
     Simple demo that shows how to generate random numbers(int and double) in C++11. Written in VS 2017

 
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//**************************************
// Name: Random numbers in C++11
// Description:Simple demo that shows how to generate random numbers(int and double) in C++11.
Written in VS 2017
// By: Thomas1965
//**************************************

#include <iostream>
#include <random>
class Random
{
public:
 int next_int(int min_val, int max_val);
 double next_double(double min_val, double max_val);
private:
 std::default_random_engine engine;
};
int Random::next_int(int min_val, int max_val)
{
 std::uniform_int_distribution<int> di(min_val, max_val);
 return di(engine);
}
double Random::next_double(double min_val, double max_val)
{
 std::uniform_real_distribution<double> di(min_val, max_val);
 return di(engine);
}
constexpr int MinInt = 1;
constexpr int MaxInt = 100;
constexpr double MinDouble = -99.9;
constexpr double MaxDouble = 99.9;
int main()
{
 Random rnd;
 std::cout << "Random test\n";
 std::cout << "-----------\n";
 std::cout << "Generating 10 random ints in the range of " 
<< MinInt << '-' << MaxInt << '\n';
 
 for (int i = 0; i < 10; ++i)
 {
std::cout << rnd.next_int(MinInt, MaxInt) << ' ';
 }
 std::cout << "\n\n\n";
 std::cout << "Generating 10 random doubles in the range of "
<< MinDouble << '-' << MaxDouble << '\n';
 for (int i = 0; i < 10; ++i)
 {
std::cout << rnd.next_double(MinDouble, MaxDouble) << ' ';
 }
 std::cout << "\n\n\n";
}


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