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Here is the code snippet which does conversion from unsigned long long (uint64) to
string/ascii/char *. 

it takes input as unsigned long long (uint64), converts it to string, it takes care of the base also.

example usage of function ulltostr is: ulltostr(1023234343453553, ptr, 10);

here is the code snippet….

 
#include <stdio.h>
 
#ifdef _MSC_VER
typedef unsigned __int64 uint64;
#else
typedef unsigned long long uint64
#endif
 
char *ulltostr(uint64 value, char *ptr, int base)
{
  uint64 t = 0, res = 0;
  uint64 tmp = value;
  int count = 0;
 
  if (NULL == ptr)
  {
    return NULL;
  }
 
  if (tmp == 0)
  {
    count++;
  }
 
  while(tmp > 0)
  {
    tmp = tmp/base;
    count++;
  }
 
  ptr += count;
 
  *ptr = '\0';
 
  do
  {
    res = value - base * (t = value / base);
    if (res < 10)
    {
      * - -ptr = '0' + res;
    }
    else if ((res >= 10) && (res < 16))
    {
        * - - ptr = 'A' - 10 + res;
    }
  } while ((value = t) != 0);
 
  return(ptr);
}

please post your comments and suggestion if any….

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Related Blog Items

• Convert integer to binary string
• Unsigned long to string (ultostr)
• Binary Streams Utility Classes
• Structure padding explained
• c/c++ blogging - January 10, 2007

This entry was written by ponnada and posted on March 22, 2007 at 10:49 am and filed under C Tidbits, Conversions. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.