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From: carroll@cs.uiuc.edu (Alan M. Carroll)
Newsgroups: comp.lang.c
Subject: Re: Source for "integer to ascii" and multiple file search-n-replace
Message-ID: <1990Nov20.153549.985@ux1.cso.uiuc.edu>
Date: 20 Nov 90 15:35:49 GMT
References: <318@cti1.UUCP> <1990Nov20.014110.16982@ux1.cso.uiuc.edu>
Sender: news@ux1.cso.uiuc.edu (News)
Reply-To: carroll@cs.uiuc.edu (Alan M. Carroll)
Distribution: comp
Organization: Technophiles Inc. - Engineers with Attitude
Lines: 49

sprintf() is often times inadequate, or too bulky. This code will convert from
a long to any base 2..36.
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
char *
UnsignedLongToString(n,base)
     unsigned long n;
     unsigned int base;
{
  char *digit = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  static char LongToStringBuffer[34];	/* 32+nul+negative sign */
  char *s = LongToStringBuffer + 33; /* at most 33 characters in binary */

  *s = 0;			/* terminate */
  while (n)			/* something there */
    {
    *--s = digit[n % base];		/* store bottom digit */
    n /= base;			/* shift right */
    }
  if (*s == 0) *--s = '0';		/* in case nothing was put in string */
  return s;
}

char *
LongToString(n,base)
     long n;
     int base;
{
  char *s;

  if (n < 0)
    {
      s = UnsignedLongToString((unsigned long) -n, base);
      *--s = '-';
    }
  else s = UnsignedLongToString((unsigned long) n, base);
  return s;
}
/* ------------------------------------------------------------------------ */
main()
{
  printf("%s\n",LongToString(-1234567,10));
  printf("%s\n",UnsignedLongToString(7654321,10));
  printf("%s\n",LongToString(0x12345,16));
}

-- 
Alan M. Carroll                Barbara/Marilyn in '92 :
Epoch Development Team          + This time, why not choose the better halves?
CS Grad / U of Ill @ Urbana    ...{ucbvax,pur-ee,convex}!cs.uiuc.edu!carroll