//==============================================================================
// Illustration of how to initialize and use the built-in C random number
// generator rand().
//
// This version creates a "random" seed from the time of day and uses
// this seed to initialize the random number generator by using it as an
// argument to srand. The result of time(NULL) is the (integer) time in
// seconds from some zero of time way back in the past. Hence, if you execute
// the code twice within a second you will get the same string of random
// numbers. 
//
// Alternatively you could type in a specific value for the integer seed, i.e.
//
// int seed;
// seed = 314159;
// srand(seed);
// 
// rand() gives an int between 0 and RAND_MAX where
// RAND_MAX = 2147483647 = 2^31 - 1 
//
// We divide rand() by RAND_MAX + 1.0 to convert it to a float between 0
// and 1 (the "+ 1.0" is to force floating point division rather than integer
// division).
//==============================================================================

#include <stdio.h>
#include <time.h>
#include <stdlib.h>

main()
{
    int k, N;
    double x;

    srand(time(NULL)); // Seed the random number generator with a "random" seed
    N = 20;
    for(k=0; k<N; k++) 
    {
	printf (" %10.6f \n", rand() / (RAND_MAX + 1.0));
    }
}