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

char *ultoa(unsigned long x,char *buf,int radix) {
  char work[33];
  register char *p = work + sizeof work;
  *--p = 0;
  do {
    char digit = x % radix;
    *--p = (digit < 10) ? digit + '0' : digit - 10 + 'A';
  } while (x /= radix);
  return strcpy(buf,p);
}

char *ltoa(long x,char *buf,int radix) {
  if (x<0) { 
    buf[0] = '-';
    ultoa(-x,buf+1,radix);
  }
  else
    ultoa(x,buf,radix);
  return buf;
}