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#!/usr/bin/env lua
--[[
Challenge 003
Challenge #2
Create a script that generates Pascal Triangle. Accept number of rows from
the command line. The Pascal Triangle should have at least 3 rows. For more
information about Pascal Triangle, check this wikipedia page.
--]]
function draw_pascal(rows)
local data = {1}
for row=1,rows do
-- print current row
for col=1,rows-row do io.write(" "); end
for col=1,row do io.write(data[col], " "); end
io.write("\n")
-- compute next row
local nxt = {1}
for col=1,row-1 do
table.insert(nxt, data[col] + data[col+1])
end
table.insert(nxt, 1)
data = nxt
end
end
draw_pascal(tonumber(arg[1]))
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