<eof> expected near 'else'

[Gtb81]

So this is the first time i have actually tried writing my own program, I am trying to make a control program for the BigReactors mod and i want to have a control terminal, but i can't seem to get past this else statement.  error: <eof> expected near 'else'

Code Select Expand

local stop, start, temp = "stop", "start", "temp"
while true do
   term.clear()
   term.setCursorPos(1,1)
   write("Please enter a command: ")
   local input = read()
   if input == start then shell.run("start") end

   if input == stop then shell.run("stop") end

   if input == temp then shell.run("temp") end
 
end

 else
  term.clear()
  write("Unknown command.")
  sleep(2)
end

[Lupus590]

You end the while loop and then have an else keyword without a corresponding if.

Also, you might want to fix the indentation on your read.

[Gtb81]

Sorry if i dont understand, i am very new to lua, how do you suggest i rewrite the else statement? i am trying to add an error message if none of the known commands are typed in.

[Lupus590]

Then you want to put in into the loop and use elseif statements instead of multiple if statements.

Code Select Expand

local stop, start, temp = "stop", "start", "temp"
while true do
   term.clear()
   term.setCursorPos(1,1)
   write("Please enter a command: ")
   local input = read()
   if input == start then shell.run("start") -- elseif has to start with an if
                             -- note the lack of an end for the if, the elseif does this for us
   elseif input == stop then shell.run("stop") -- note the lack of a space, we could do else if but
                     -- then we would need to add extra ends and the proper indentation would get messy

   elseif input == temp then shell.run("temp")

   else  -- you can have an else as the last part of an elseif, end is also valid to finish off a elseif chain
     term.clear()
     write("Unknown command.")
     sleep(2)
   end -- we still need a end here, but just one for the entire elseif chain
end

 

[Gtb81]

thank you, i knew about elseif statements though i had not known how to use them. Is there a way to add the ability to write into the command prompt a variable? ie rods (0-100) or maybe some literature where i might learn more about this?