ComputerCraft Wiki - User contributions [en]

Calculator Tutorial

2012-05-05T23:16:04Z

Mman2112: tutorial on several basic functions

<code>

-- anything after two dashes is a comment, and wont be compiled.
--[[ this is also a comment
and so is this
]]--

--this tutorial will teach you the basics of the print() and read() functions, if statements, as well as some variable use and math operations.

print("Do you want to add, subtract, multiply or divide?") -- this code displays the question within the quotation marks
op = read() -- this code creates a variable called 'op', the read() function stalls the program to accept user input, which is stored in op
print("") -- just gives us some space to work with

print("what is the first number to be operated on?")

num1 = read() -- accepts the first number to be stored in the variable 'number1'
print("")

print("and the second number?")
num2 = read()
print("")

-- now we operate on the number depending on what the user typed first

if op == "add" then -- if you need help with conditional statements, see this page: [http://www.troubleshooters.com/codecorn/lua/luaif.htm]
result = num1+num2
end

if op == "multiply" then
result = num1*num2 -- asterisk represents multiply
end

if op == "divide" then
result = num1/num2
end

if op == "subtract" then
result = num1-num2
end

</code>

User talk:Mman2112

2012-05-05T22:45:14Z

Mman2112: Created page with "my goal is to add some missing pages to the wiki, hopefully others will improve upon them."

my goal is to add some missing pages to the wiki, hopefully others will improve upon them.

Os.clock

2012-05-05T22:40:31Z

Mman2112: use of os.clock()

Returns the amount of time the computer craft computer has been running, note that this may not be the amount of time the program has been running. the function os.clock() is useful for debugging, for example to see how long a custom function takes to execute use the following code:

<code>x = os.clock() -- compensates for time already passed
myfunction() -- function to be tested
y = (os.clock() - x) -- calculates time change
print(y)

</code>