If it is an unexpected amount of white space, they should check their parentheses. The former indents a selected region, the latter the entire Definitions window. It is a rule that tells us and the computer how to produce data from some other data. Large programs consist of many small programs and combine them in some manner. It is therefore important that programmers name each rule as they write it down.
Programs combine basic operations.
Once we have defined a program, we may use it as if it were a primitive operation. For each variable listed to the right of the program name, we must supply one input. Students may have doubts about this model of how the computer works. These doubts are due to wide-spread misconception about computers. No matter at what level we choose to explain the workings of a computer, we always use an approximation.