#include <stdlib.h>
#include <time.h>  /* time.h is required for random number generator */
#include "general.h"
#include "rand.h"
#include "neuron_util.h"

/* SEED and loadingtime are required to get random numbers */
unsigned int SEED;
long loadingtime;

/* return random number from 0 to 1 */
double drand(void)
{
    return ((double)(rand() % RAND_MAX) / (double)RAND_MAX);
}

/* return random number from -1 to 1 */
double drand2(void)
{
    return (drand() * 2.0 - 1.0);
}

/* initialize of random number sequence */
int init_random(int arg) {
    if ( arg == 0 ) {
	SEED = (unsigned)time(&loadingtime); 
    } else {
	SEED = (unsigned)arg;
    }
    srand(SEED);
    return OK;
}

unsigned int get_seed(void){
    return SEED;
}