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\label{Numerical_Response_Simple_Example} A script consists of several \textbf{statements}, separated by \textbf{semi-colons}. A \textbf{statement\index{statement}} is the smallest kind of instruction to the computer. Most problems will be built from several statements. A script can contain \textbf{comments}, which are not interpreted as statements by the computer. Comments start with \textbf{\#} and go to the end of that line. Thus, if a line starts with \#, the whole line is ignored. Comments can also begin in the middle of a line. It is a good idea to comment more complicated scripts, as it can be very difficult to read a large script and figure out what it does. It is a \emph{very} good idea to adopt some sort of commenting standard, especially if you are working in a group or you believe other people may use your problems in the future. \begin{itemize} \item One of the simplest statements in LON-CAPA is a \textbf{variable assignment}. A \textbf{variable} can hold any value in it. The variable name must start with a \textbf{\$}. In the \textbf{Script}, you need to assign to variables before you use them. Put this program into the \textbf{Script} field of the Numerical Response: \begin{lyxcode} \$variable~=~3; \end{lyxcode} This creates a variable named \textbf{variable} and assigns it the value of {}``3''. That's one statement. \end{itemize} Variable names are \emph{case sensitive}, must start with a letter, and can only consist of letters, numbers, and underscores. Variable names can be as long as you want.