218, example 1, 21-1-99

$ hostname
rabbit.eng.miami.edu
$ whoami
stephen
$ nslookup rabbit.eng.miami.edu 
Server:  miavax.ir.miami.edu
Address:  129.171.32.1

Name:    rabbit.eng.miami.edu
Address:  129.171.33.6
$ cat t1.c        ........ or use pico or vi or whatever 
#include 

void f(int a)
{ int x,y;
  x=a/10;
  y=a%10;
  if (a==0) return;
  printf("%d", y);
  f(x);
  printf("%d", y);
  return; }

void main(void)
{ int w,m;
  m=123;
  f(m);
  printf("\n"); }
$ cc t1.c
$ a.out
321123
$ cc t1.c -o t1        ....... alternative way to compile
$ t1
321123
$