easy mining turtle code, for mining

Hello, this is my first code so its not that good but its ok, its really short but it can mine 300 blocks, you have to do this underground or in a cave or something. Go have fun :D/> post if you have tried it and what you think of it, i am making a new better one later :D/>
pastebin : http://pastebin.com/wdDUiSqM
code :

cond = 1
while cond ~= 100 do
turtle.dig()
turtle.digUp()
turtle.digDown()
turtle.forward()
cond = cond + 1
end