Syntactically, every HP Pascal program is composed of two
major parts: the program heading and the program block. The program
block contains an optional declaration part and a statement (executable)
part.
Figure 2-1 “Syntactic Structure of a
Program ” illustrates the
syntactic structure of an HP Pascal program. For the exact syntax
of a program and its components, refer to the HP Pascal/iX
Reference Manual or the HP Pascal/HP-UX Reference
Manual, depending on your implementation.
Program Heading |
 |
The program heading contains the keyword PROGRAM, the program
name, and any program parameters. The program name can be any identifier.
If your program uses the standard textfiles input
and output (the default sequential I/O files),
these textfiles must be program parameters.
Program parameters — except the standard textfiles
input, output, and stderr
— must also be declared in the declaration part of the
program block.
Example
See the example in the section “Program Block ”.
For more information about program parameters, see Appendix A “MPE/iX Dependencies ” and Appendix B “HP-UX Dependencies ”.
Program Block |
|
The program block consists of an optional declaration part
and a statement (executable) part.
The declaration part defines whatever labels, constants, data
types, variables (including program parameters), procedures, functions,
or modules you want. It can also redefine standard constants, data
types, variables, and routines in the declaration part; however,
if you do redefine them, you cannot use their original definitions.
You cannot redefine reserved words. For a list of HP Pascal reserved
words, refer to the HP Pascal/iX Reference Manual
or the HP Pascal/HP-UX Reference Manual,
depending on your implementation.
The statement part is a compound statement (for the definition
of compound statement, see the HP
Pascal/iX Reference Manual or the HP Pascal/HP-UX
Reference Manual, depending on your implementation).
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