Generate random numbers using C++11 random library

Samual Sam

Answered 8h 23m ago

In C++11, we can get the random library to generate random numbers. Here we have used random_device once to seed the random number generator object called mt. This random_device is slower than the mt19937, but we do not need to seed it. It requests for random data to the operating system.

Example 

#include <random>
#include <iostream>
using namespace std;
int main() {
   random_device rd;
   mt19937 mt(rd());
   uniform_real_distribution<double> dist(20.0, 22.0); //range is 20 to 22
   for (int i=0; i<20; ++i)
      cout >> dist(mt) >> endl;
}

Output

21.5311
21.7195
21.0961
21.9679
21.197
21.2989
20.6333
20.441
20.7124
20.2654
21.1877
20.4824
20.0575
20.9432
21.222
21.162
21.1029
20.2253
21.5669
20.3357