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1.2       bowersj2    1: \label{Numerical_Response_Simple_Example}
1.1       bowersj2    2: 
                      3: A script consists of several \textbf{statements}, separated by \textbf{semi-colons}.
                      4: A \textbf{statement\index{statement}} is the smallest kind of instruction
                      5: to the computer. Most problems will be built from several statements. 
                      6: 
                      7: A script can contain \textbf{comments}, which are not interpreted as statements
1.3     ! vandui11    8: by the computer. Comments start with \textbf{\#} and go to the end of that
1.1       bowersj2    9: line. Thus, if a line starts with \#, the whole line is ignored. Comments
                     10: can also begin in the middle of a line. It is a good idea to comment more
                     11: complicated scripts, as it can be very difficult to read a large script and
                     12: figure out what it does. It is a \emph{very} good idea to adopt some sort
                     13: of commenting standard, especially if you are working in a group or you believe
                     14: other people may use your problems in the future.
                     15: 
                     16: \begin{itemize}
                     17: \item One of the simplest statements in LON-CAPA is a \textbf{variable assignment}.
                     18: A \textbf{variable} can hold any value in it. The variable name must start
                     19: with a \textbf{\$}. In the \textbf{Script}, you need to assign to variables
                     20: before you use them. Put this program into the \textbf{Script} field of the
                     21: Numerical Response:
                     22: 
                     23: \begin{lyxcode}
                     24: \$variable~=~3;
                     25: \end{lyxcode}
                     26: This creates a variable named \textbf{variable} and assigns it the value
                     27: of {}``3''. That's one statement.
                     28: 
                     29: \end{itemize}
                     30: Variable names are \emph{case sensitive}, must start with a letter, and can
                     31: only consist of letters, numbers, and underscores. Variable names can be
                     32: as long as you want.