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Held Friday, January 26, 2001
Summary
Today we consider revisit the basics of compilation by looking at the precise steps that may be involved in translating some sample programs.
Due
Notes
Overview
{ Program: count. Purpose: Count from 1 to max Author: Samuel A. Rebelsky Version: 1.0 of 26 January 2001 } program count(output); const max = 20; procedure countto(top: integer); var i: integer; { counter variable } begin for i := 1 to top do writeln(i + 0.0) end; begin countto(max) end.
PROGRAM ID(count) OPEN_PAREN ID(output) CLOSE_PAREN SEMICOLON CONST ID(max) EQUALS NUMBER(20) SEMICOLON PROCEDURE ID(countto) OPEN_PAREN ID(top) COLON TYPE(integer) CLOSE_PAREN VAR ID(i) COLON TYPE(integer) SEMICOLON BEGIN FOR ID(i) ASSIGN NUMBER(1) TO ID(max) DO ID(writeln) OPEN_PAREN ID(i) OPERATOR(+) NUMBER(0.0) CLOSE_PAREN END SEMICOLON BEGIN ID(countto) OPEN_PAREN ID(max) CLOSE_PAREN END PERIOD
program program-head PROGRAM ID(count) OPEN_PAREN file-identifier ID(output) CLOSE_PAREN SEMICOLON block label-declaration empty constant-definition-part CONST constant-definition ID(max) EQUALS constant NUMBER(20) more-constant-defintions empty type-definition-part empty variable-definition-part empty procedure-definition-part ...
program name: ID(count) procedures: ... body: ...
i
is a real number?
max
?
i
after the loop?
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Disclaimer: I usually create these pages on the fly. This means that they are rarely proofread and may contain bad grammar and incorrect details. It also means that I may update them regularly (see the history for more details). Feel free to contact me with any suggestions for changes.
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The source was last modified Mon Jan 22 10:39:10 2001.