Comparing A Struct To A Passed Parameter

[Anonymous]

I have a program that I need to do for class and actually want
to learn something so I don't want to post my entire program.
Basically what I have is a dynamically allocated arrays that have structs. My problem is I'm trying to do a comparision on the passed in InputIsbn to see if it matches with something in the
ptrList[index]->Isbn if it does I want to return the index if not
a -1.

Does anyone have any ideas to where the problem may lie?
I know I must be making some small error that is messing everything up. This seems like it should work but it doesn't. Anyone have any ideas?

int BookList::SearchIsbn(string InputIsbn)
{

    int index;
    int comparison;

&nbsp;&nbsp;&nbsp;&nbsp;for (index = 0; index < Length; index++)
&nbsp;&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;co mparison = InputIsbn.compare( ptrList[index]->Isbn );
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;if (comparison == 0)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;cout << "The two strings are the same\n";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;return index;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;}

&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;return -1;

}

[tegwin]

I would like to help yah out there mate.. but to be honest I am having a tough time trying to follow ur code..hard with the little bit that you have supplied..plus I do not know what kind of error you are receiving..

EDIT:
hmm... not sure how you are calling the function
SearchIsbn(string InputIsbn)

is this similar to ur code?

struct BookList
  {
    string Isbn;
    int SearchIsbn(string);
  }

int main()
  {
     BookList* ptrList[20];
  }

in order to call SearchIsbn wouldn't u have to type

ptrList[0]->SearchIsbn("Bob");

?? I believe you would have to pass in one index at a time wouldn't u?

ptrList->SearchIsbn("Bob")  // I don't think this is possible..

I hardy use pointers.. let alone structs so i may be way off... if this were the case then inside ur function definition..

comparison = InputIsbn.compare( ptrList[index]->Isbn );

would need to be changed to

comparison = InputIsbn.compare( Isbn );

like i said earlier.. hard to pinpoint ur problem when i have no idea what it is.. how u are calling the function.. what the struct looks like.. etc... this is the best i could come up with..

perhaps this code could be some assistance

struct BookList
  {
    string Isbn;
    int SearchIsbn(string);
  }

int main()
  {
     BookList* ptrList[20];
     ptrList[0]->Isbn = "Hello";
     int answer;
     for(index = 0; index < 20; index++)
       {
         answer = ptrList[index]->SearchIsbn("Hello");
         if (answer != -1)
            break;
       }
     cout << answer;
    return 0;
   }

int BookList::SearchIsbn(string InputIsbn)
{

   
   if (InputIsbn.compare( Isbn ) == 0)
      {
          cout << "The two strings are the same\n";
         return index;
      }
   return -1;
}

this code has not be tested.. just so u know.. i'm too lazy..

ICQ#173580303