C++: Writing game program...Rogue-Like?

I'm writing a rogue like game for my cs class. Everything is running fine but I need to import the walls for the game. The coordinates for the walls are in 3 text files. How do I inport it to the correct position on screen.
This is the code i'm using but it isn't printing right on the screen.
Can you look over? Thank you!

Code:

bool loadData( int coordinates[MAX_ARRAY][MAX_ARRAY], int fileIndex, int &arraySize )
{
char fileOne[] = "lowlevel.txt";
char fileTwo[] = "midlevel.txt";
char fileThree[] = "highlevel.txt";
ifstream fin;

if ( fileIndex == 1 )
    {
      fin.clear();
      fin.open( fileOne );
    }

else if( fileIndex == 2 )
    {
      fin.clear();
      fin.open( fileTwo );
    }

else if( fileIndex == 3)
   {
      fin.clear();
      fin.open( fileThree );
   }

else
    return false;


while ( fin.good() && arraySize < 100 )
     {
       fin >> coordinates[arraySize][arraySize];
       arraySize++;

       fin >> coordinates[arraySize][arraySize];
      arraySize++;

     }
    fin.close();


return true;
}

Hey,

The way you are navigating through your array looks linear. Like you are saving data in a straight line such as on a graph would be y = x.

It looks like you are only saving into positions that would satisfy the equaion Y = X. So points (0, 0), (1, 1), (2, 2) ect. If it is a array that is 100, by 100 then you have 1000 possible positions but you are writing to only 100 of them.