Structured Programming in PASCAL by Genetic Computer School

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98 Press RETURN key for main menu After testing this design by walking through it with several examples, convert the design to a Pascal Program. The program will have the form shown in Figure 2. PROGRAM GeometricShapes; VAR Select : CHAR; PROCEDURE PresentMenu, BEGIN {instructions for this module step go here}; END; PROCEDURE DoTriangle; VAR {variables this procedure needs go here}; BEGIN {instructions for this module step go here}; END; PROCEDURE DoRectangle; VAR {variables this procedure needs go here}; BEGIN {instructions for this module step go here}; END; Copyright © Genetic Computer School, Singapore 1995 Page 62 PROCEDURE DoTrapezoid; VAR {variables this procedure needs go here}; BEGIN {instructions for this module step go here}; END; BEGIN REPEAT CLRSCR; PresentMenu; READLN(Seiect); CLRSCR; CASE Select OF 'A' : DoTriangle; 'B' : DoRectangle; 'C' : DoTrapezoid; END; UNTIL Select = 'Q' END.

It is now time to fill in the procedure blocks with their instruction. Again, the design and its refinements enter the process. The definition of each procedure is much like writing a small program. The refinement of the step (developed in the design of the solution) is used as a guide to write the procedure. From the Presentmenu refinement, the procedure will be as follows: PROCEDURE PresentMenu; BEGIN WRITELN( The geometric shapes available are : ); WRITELN(' A. Triangle'); WRITELN(' B. Rectangle'); WRITELN(' C.

Otherwise normal execution will resume with statement3. EXAMPLE: Write a program to count to ten. PROGRAM REPEATCOUNT; VAR COUNTER: INTEGER; BEGIN WRITELN('REPEAT COUNT'); COUNTER : = 1; REPEAT WRITELN(COUNTER); COUNTER : = COUNTER + 1; UNTIL COUNTER > 10; END. RESULT: REPEAT COUNT 1 2 3 ... 10 PROGRAM EXPLANATION: The program uses an integer control variable, COUNTER, initialized to one. The program writes successive values of COUNTER to the loop. The loop ends when COUNTER becomes greater than ten.

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