Generate integers in the semi-closed range with gsl

rngint.c

// clang -O3 -DHAVE_INLINE rngint.c -o rngint -lgsl -lgslcblas

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_randist.h>

// Get an integer in the [a,b) semi-closed range.
#define get_ulong(rng,a,b)    (gsl_rng_uniform_int(rng,b-a)+a)
#define get_uint(rng,a,b)    ((unsigned int)get_ulong(rng,a,b))
#define get_int(rng,a,b)     ((int)get_ulong(rng,a,b))

int main()
{
    gsl_rng *rng = gsl_rng_alloc(gsl_rng_taus2);
    gsl_rng_set(rng, time(NULL));

    int i = 0;
    for (; i < 1000; ++i)
    {
        printf("%d\n", get_int(rng,6,28));
    }
    return 0;
}