HP Pascal/iX Reference Manual (31502-90022)

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Chapter 7 Program Structure
An HP Pascal program consists of two major parts: the program heading
and the program block . The program block includes the declaration part
which consists of definitions of constants and types, and declarations of
labels, variables, procedures, functions, and modules. This chapter
describes in detail the program heading and program block . This includes
the declaration part and module as well as the function and procedure.
Below is an example of an HP Pascal program.
Syntax
Compilation_unit:
Example
PROGRAM minimum; { The minimum program that the HP Pascal }
BEGIN { compiler will process successfully: }
END. { no program parameters. }
PROGRAM show_form1 (output); { Uses the standard textfile output }
BEGIN
writeln ('Greetings!') { and the standard procedure writeln. }
END.
PROGRAM show_form2 (input,output);
VAR
a,b,total: integer;
FUNCTION sum (i,j: integer): integer; { Function declaration }
BEGIN
sum:= i + j
END;
BEGIN
prompt ('Enter two integers: ');
readln (a,b);
total:= sum (a,b);
writeln ('The total is: ', total)
END.
Program Heading
The program heading consists of the reserved word PROGRAM, an identifier
that specifies the program name and an optional parameter list. The