#include<stdio.h>
main(b,a){a>b?main(1,0):printf("%dn",a),main(a+b,b);}

class F{public static void main(String[]v){int x=v.length,a,b;System
.out.println(a=x>>16);main(new String[(b=x&0xFFFF)+1<<16|a+b]);}}

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

int main(int argc, char *argv[])
{
    static int i = 0, j= 1;
    int res, max;
    /*
     * You could add some check for argc and argv
     */
    max = atoi(argv[1]);
    printf("%d ", i);
    res = i + j;
    i = j;
    j = res;

    if (j > max)
    {
        printf("n");
        exit(0);
    }
    main(argc, argv);
}

$  gcc -std=c99 -Wall tst.c -o tst
$ ./tst 1000
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610
$

#include <stdio.h>

int fib1=0;
int fib2=1;
int fib_tmp;

int main()
{
  printf("%d ",fib1);
  fib_tmp=fib1+fib2;
  fib1=fib2;
  fib2=fib_tmp;
  if (fib1>0)
    main();
}