什么是int（input（））的Lua等价物？

Question

I'm asking the user for a number using

var = io.read()

and then when I do

if var == 1 then
    print ("Thing One")
elseif var == 2 then
    print ("Thing Two")
else
    print ("Thing Three")

This always returns "Thing Three" I am presuming this means I need var to get an integer, like when python uses int(input())

Answer 1

Lua supports an argument to io.read() call. You can pass *n or *number as a string to it so that your input would be a number or nil .

print "enter a number:"
n = io.read("*number")
if not n then error("invalid input") end

You should also take a light reading of this page of PiL .

---

So, your code shall be:

var = io.read( "*n" ) -- or io.read( "*number" )

if var == 1 then
    print ("Thing One")
elseif var == 2 then
    print ("Thing Two")
else
    print ("Thing Three")
end