Programs                 Pascal Program Structure

    A Standard Pascal program has the following structure:

         program <name>(<parameters>);

         <label section>
         <const section>
         <type  section>
         <var   section>

         <subprograms>

         begin
           <main body>
         end.

    where the following definitions hold:

             <name>   Any legal identifier.

       <parameters>   External files associated with the program. These
                      identifiers should be declared as file variables in
                      the global variable section.

    <label section>   The keyboard LABEL followed by a list of labels (1-
                      to 4-digit numbers, separated by commas and ending
                      with a semicolon).

    <const section>   The keyword CONST followed by one or more constant
                      declarations.

     <type section>   The keyword TYPE followed by one more more data type
                      declarations.

      <var section>   The keyword VAR followed by one or more variable
                      declarations.

      <subprograms>   Any number of procedures or functions.

        <main body>   Any number of statements, separated by semicolons.

    In Standard Pascal, each of the sections above--label, const, type,
    var, and subprogram--can appear only once and must appear in the order
    given. If no such declarations are needed--for example, if you have no
    labels--then you can simply omit that section.

    Turbo Pascal is more flexible in its definition of program structure.
    First, the <parameters> section is neither required nor recognized; if
    put there, it is ignored. Second, you can freely rearrange the order
    of the label, const, type, var, and subprogram sections, and you can
    have multiple instances of each.