# Difference between revisions of "Calculator Tutorial"

``` ```
``` -- 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 = tonumber(read()) -- accepts the first number to be stored in the variable 'number1' print("") print("and the second number?") num2 = tonumber(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: [1] result = num1+num2 print(result) -- this prints the result end if op == "multiply" then result = num1*num2 -- asterisk represents multiply print(result) end if op == "divide" then result = num1/num2 print(result) end if op == "subtract" then result = num1-num2 print(result) end ```