lua自带的Example（二）

--Example 13
--More Output
--io.write writes to stdout but without new line

io.write("Hello from Lua!")
io.write("Hello from Lua!")

--Use an empty print to write a single new line
print()


-----------------Output---------------
Hello for Lua!Hello for

--Example 14
--Tables
--Simple table creation

a = {} --{} creates an empty table
b = {1, 2, 3} --create a new table containing numbers 1, 2, 3
c = {"a", "b", "c"} --creates a table containing strings a, b, c
print(a, b, c) --print do not print directly, we all get back to this


-----------------Output----------------
table: 004106A0 table: 00412340 table: 00411466


--Example 15
--More tables
--Associate index style

address = {} --empty address
address.street = "X"
address.streetNumber = 360
address.AptNumber = "2a"
address.City = "M"
address.state = "N"
address.country = "S"
print(address.streetNumber, address["AptNumber"])


------------------Output-----------------

360   2a

--Example 16
--if statement
--Simple if
a = 1
if a == 1 then
    print("a is one")


-----------------Output------------------

a is one


--Example 17
--if else statement

b = "happy"
if b == "sad" then
    print("b is sad")
else
    print("b is happy")
end

------------------Output------------------

b is happy

--Example 18
--if elseif else statement
c = 3
if c == 1 then
    print("c is one")
elseif  c == 2 then
    print("c is two")
else
    print("c isnot one and c isnot two , c is three")
end

------------------Output--------------------

c isnot one and c isnot two, c is three

--Example 19
--Conditional assignment
-- value = test and x or y

a = 1
b = (a == 1) and "one" or "not one"
print(b)

-- is equivant to

a = 1
if a == 1 then
    b = "one"
else
    b = "not one"
end
print(b)


---------------------Output--------------------

one
one


--Example 20
--While statement
a = 1
while a ~= 5 do
    a = a+1
    io.write(a.. " ")
end


----------------------Output---------------------

 2    3    4    5