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local filename = grid.txt local grid = loadGrid ( filename ) - - function to load the grid from a file function loadgrid (

local filename = "grid.txt"
local grid = loadGrid(filename)
--function to load the grid from a file
function loadgrid(filename)
local file = io.open(filename ,"r")
local grid ={}
if file then
for line in file:lines do
local row ={}
for num in line:gmatch("%d+") do
table.insert(row, tonumber(num))
end
table.insert(grid, row)
end
file:close()
else
print("Error : Unable to open the file.")
os.exit(1)
end
return grid
end
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