Programmer's Guide to the Zeno Interpreter

A summary of the elements of the language are shown in this appendix.

conventions

• An italicized item is an elements of code determined by the programmer.
• A bracketed [item] is optional.
• Items in braces {item} are optional and may be repeated.

elements

A Zeno program is made up of:

    declarations
    subprograms 

A subprogram is one of:

1. The main program:

       program
           declarations and statements 
       end program
   

2. A subprogram that returns a value on the stack:

       function name( parameter{, parameter} ) : type specification
           declarations and statements
       end function
   

   or, if there are no parameters:

       function name : type specification
           declarations and statements
       end function
   

3. A subprogram that operates on data without returning a value on the stack.

       procedure name( parameter{, parameter} ) 
           declarations and statements
       end procedure
   

   or, if there are no parameters:

       procedure name
           declarations and statements
       end procedure
   

A formal parameter is:

    [var] name{, name} : type specification