gen_floats.c

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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
 
int main(int argc, char** argv)
{
        if (argc < 2)
        {
                fprintf(stderr, "Usage: %s nb_floats\n", argv[0]);
                return EXIT_FAILURE;
        }
 
        int i;
        int n = atoi(argv[1]);
        unsigned int seed;
        int frand = open("/dev/urandom", O_RDONLY);
        read(frand, &seed, sizeof(unsigned int));
        close(frand);
 
        srand(seed);
        for (i=0; i < n; i++) {
                float f = (float) rand();
                fwrite(&f, sizeof(float), 1, stdout);
        }
        fflush(stdout);
 
        return EXIT_SUCCESS;
}