无符号长距离值

Question

I'm making a binary converter for iPhone, and for convert a number from base X to other base I use this method:

+(NSString*)FromXToOtherBase:(unsigned long long)base number:(unsigned long long)number
{

  unsigned long long temp_risu=number;
   //int i=0;
   //base is the destination base
   NSMutableArray*rest=[[NSMutableArray alloc] init];
   while(temp_risu!=0)
   {
      NSNumber*rest_=[NSNumber numberWithLongLong:(temp_risu%base)];
      [rest addObject:rest_];
      temp_risu=temp_risu/base;
      rest_=Nil;

    }

   NSMutableArray*rest_reverse=[[NSMutableArray alloc] init];

   for(int i=[rest count]-1;(i>-1);i--)
   {
     [rest_reverse addObject:[rest objectAtIndex:i]];
   }

   return [rest_reverse componentsJoinedByString:@""];
}

This method works but when the number becomes bigger and bigger I have problem with the range of unsigned long long type and the conversion becomes unreliable. How Do I solve this problem?

Answer 1

Well for me it seems like , you assign Unsigned long long in to signed long long

   NSNumber*rest_=[NSNumber numberWithLongLong:(temp_risu%base)];

change this line with

    NSNumber*rest_=[NSNumber numberWithUnsignedLongLong:(temp_risu%base)];

I think it should be enough.