Reading data from a file into main

[tarak]

Hi,
I need help with reading a file given to us into the main.cpp using a 2D array.

The question is:
Implementing a function to read in a map from a file. The map is a 10 by 10 array of integers that is to be stored in a file: map.txt

the file map looks like this:
0 0
0 9 0 9 0 0 0 0 0 0
0 -1 0 0 0 0 0 9 0 0
9 -1 0 0 -1 9 -1 0 0 0
0 9 0 -1 0 0 0 -1 0 0
0 0 9 0 0 9 0 -1 0 0
0 9 -1 9 0 0 9 9 0 -1
9 0 0 0 -1 0 0 0 0 -1
0 -1 0 0 9 0 0 9 0 0
9 0 0 0 9 0 9 9 0 0
-1 0 9 0 9 0 9 0 0 999

The function must accept a 2D array as a parameter, then fill this 2D array using what is read in from the file.
If you read a 0, -1 or 999 then store it as a 0, -1 or 999 respectively in the array. However if a 9 is read in then we will generate a random number between 1 and 7 to store in the array instead. So for example if the following row is read in from the file: 0 0 -1 0 9 -1 0 9 0 0
Then it may be stored in the array like so:
0 0 -1 0 4 -1 0 2 0 0


Thanks guys

[Moschops]

int array[10][10];

// read file into array
int* arrayLocationToWriteTo;
for (int eger=0; eger<100; eger++)
{
  inputFile >> *arrayLocationToWriteTo;
  if (*arrayLocationToWriteTo== 9)
  {
    *arrayLocationToWriteTo= randomNUmberBetweenOneAndSeven();
  }
  arrayLocationToWriteTo++;
}

[tarak]

Hi
thanks
so this is the way to do the question?

[Moschops]

It's a way. It relies on you understanding what actually happens in memory when you create a 2D array.

[tarak]

So what happens in the memory when you create a 2D array

[SirSmilesaLot]

Nothing much,
int array[10][10];
100, continous blocks of memory are allocated for array(each block is of size of int), in case the 100 continuous blocks are not available it throws a memory alloc exceprtion.

[cire]

If there isn't enough memory on the stack, that will likely cause your program to crash, but it won't throw an exception; and it's one contiguous block of memory with space for 100 elements.

@OP: If you don't attempt to solve this on your own, you're unlikely to get constructive responses. Show code.

[SirSmilesaLot]

http://www.cplusplus.com/doc/tutorial/arrays/

[Doolittle]

You think this part's hard? Just wait until you get to the part where you have to encounter the monsters.