// This program reads in data from "grid_data.txt" to a 10 X 20 array.  The user is prompted for indices into
// the array and the program will display the contents of the cells neighboring the input cell indices.
 
#include <iostream>
#include <fstream>

using namespace std;

int main()
{
	int i, j, row_select=0, col_select=0;
	const int row = 10, col = 20;
	char grid[row][col];
	ifstream infile;

	infile.open("input.txt");
	if(!infile)
	{
		cout << "Could not open input file, please check."<<endl;
		return 1;
	}
	// read the data into the array grid
	for (i=0;i<row; i++)
	{
		for (j=0; j<col; j++)
		{
			infile >> grid[i][j];
			cout<<" "<<grid[i][j];
		}
		cout << endl;
	}
	
	// get the cell that you want to look at neighbors of
	cout << "Enter a row and column to indicate a cell to check around"<<endl;
	cin>> row_select >> col_select;

	// check to see if the entered coordinates are out of range - enter again if so
	while ((row_select <0)||(row_select >= row)||(col_select < 0)||(col_select>=col))
	{
		cout << "One or more of your indices is out of range, try again"<<endl;
		cin>>row_select>>col_select;
	}
	
	cout << endl << "The neighbors of grid["<<row_select<<"]["<<col_select
				 <<	"] are: "<<endl;
	for (i=row_select-1; i<=row_select+1; i++)
		for (j=col_select-1; j<=col_select+1; j++)
			// make sure on grid - not out of bounds
			if ((i>=0)&&(i<row)&&(j>=0)&&(j<col))
				// don't want to print element selected
				if (!((i==row_select)&&(j==col_select)))  
					cout<<"grid["<<i<<"]["<<j<<"] contains : "<<grid[i][j]<<endl;
		cout<<endl;
	return 0;
}