Converting Decimal to Hexadecimal

Sometimes we need to convert a decimal value into a hexadecimal, usually when we're dealing with hardwares. I got the source from this website and modify it to work in C++ Builder environment. Well, I'm just a practical programmer so if things work smoothly and my program runs well without memory leaks I will be happy enough.

However, I also care about re-usability of my code, so I change the source code a little bit to make it easier to be used in the future:

AnsiString dec2hexConv(int dec)
{
 int n;
 int i;
 int len = 0;
 char str[20]  = {0};
 int temp_dec = dec;

 while(temp_dec != 0)
 {
   temp_dec /= 16;
   len++;
 }

 i = len - 1;

 while(dec != 0)
 {
   n = dec % 16;
   dec /= 16;

   if(n < 10 )
   {
     str[i--] = n + '0';
   }
   else
   {
     str[i--] = (n - 10) + 'a';
   }
 }

 str[len] = '\0';
 return AnsiString(str);
}

Hope it is useful..