/* 
   This program prints ten random real numbers.
   The source code explains how to use random numbers in C++.
*/

#include <iostream>

#include <cstdlib>
    // cstclib defines functions rand() and srand() and the constant RAND_MAX

#include <ctime>
    // ctime defines the time() function that is used to initialize
    // the random number generator.


int main() {

   srand(time(0));  
      // Initialize the random number generator.  If this is not done,
      // then the program will print out exactly the same random
      // numbers each time it is run.  The function time(0) returns
      // the number of seconds since January 1, 1970 (a so-called
      // UNIX time stamp).  This means that when the program is run
      // at different times, it will output different numbers.
      
   cout << "\nTen random numbers between 0 and 1, inclusive:\n\n";
 
   for (int i = 0; i < 10; i++) {
   
      int random_int = rand();  
          // A random integer between 0 and RAND_MAX, inclusive.
          
      double random_real = static_cast<double>(rand()) / RAND_MAX;
          // A random double between 0 and 1, inclusive.  If you
          // don't want to include 1 in the possible valued,
          // use:  random_real = rand() / (RAND_MAX + 1.0);
          
      cout << "   " << random_real << endl;
   
   }
   
   cout << endl;
   
}