More Procedural Facts

• Procedures can be declared in any order, but they must at least be prototyped before they are referenced

• A ZPL program begins with a program statement

  program PName;
  

• There must be a procedure with the identical name as the program; the procedure is the entry point (main)

  procedure PName();
  

• Notice that global state information is typically defined as global variables rather than as variables “passed in” to each procedure

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