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local NL = "\n" -- New line character
local HW = 70 -- Header width
local function header(title)
print(NL .. string.rep("*", HW))
print(string.format(" > %s", title))
print(string.rep("*", HW) .. NL)
end
-- Loops and tables.
header("Loops and tables")
for i=1, 5 do
print("- Loop with index " .. i)
end
local names = {
"John",
"Bob",
"Grug",
}
for _, name in pairs(names) do
print(string.format("* This create is called %s.", name))
end
-- Math stuff.
header("Math stuff")
print("Square root of 16:", math.sqrt(16))
print("Absolute value of -7:", math.abs(-7))
print("Ceiling of 2.3:", math.ceil(2.3))
print("Floor of 2.9:", math.floor(2.9))
print("Rounding 3.6:", math.floor(3.6 + 0.5))
print("Cosine of 0:", math.cos(0))
print("Sine of 90 degrees:", math.sin(math.rad(90)))
math.randomseed(os.time())
print("Random number (1-100):", math.random(1, 100))
print("2 to the power of 3:", math.pow(2, 3))
print("Natural log of 2.71828:", math.log(2.71828))
print("Base-10 log of 1000:", math.log10(1000))
print("Pi:", math.pi)
print("Convert 180 degrees to radians:", math.rad(180))
print("Convert Pi radians to degrees:", math.deg(math.pi))
-- Coroutines.
header("Coroutines")
function producer()
return coroutine.create(function()
for i = 1, 3 do
print("Producing:", i)
coroutine.yield(i)
end
end)
end
function consumer(prod)
while true do
local status, value = coroutine.resume(prod)
if not status or value == nil then break end
print("Consumed:", value)
end
end
co = producer()
consumer(co)
function sneaky()
print("Coroutine starts")
coroutine.yield() -- Pause and give control back.
print("Coroutine resumes after yield")
end
co = coroutine.create(sneaky)
print("First resume:")
coroutine.resume(co)
print("Second resume:")
coroutine.resume(co)
-- IO stuff.
header("File IO")
print("Reading file adams.txt...\n")
local file = io.open("adams.txt", "r")
if not file then
print("Failed to open file.")
return
end
for line in file:lines() do
print(line)
end
file:close()
-- Exposing C functions.
header("Exposing C functions")
local result = c_sum(3, 5)
print("Sum is", result)
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