Advanced Pascal Programming Language Problems
© 1998 by Dr. Thomas W. MacFarland -- All Rights Reserved
Instructions: Review the following program and see if you can
predict the outcome by completing a "pencil
trace" of the code.
Program output is provided at the end of this
page.
Compiler: The program was prepared using Standard Pascal
on a UNIX-based host computer.
% cat PASCAL/advanced_pencil-10.p
{ Advanced Pascal Programming Language Exercises
Dr. Thomas W. MacFarland
advanced_pencil-10.p
}
{ The purpose of this program is to:
1. Demonstrate the use of an array of integers.
2. Demonstrate the printing of individual elements of
an array.
3. Demonstrate the use of downto in a loop.
}
program Demonstrate_Arrays_1;
var A,B : integer;
Array_Name : array[1..12] of integer;
begin
Array_Name[1] := 5;
writeln('Array_Element A B');
writeln('------------------------------');
A := 100;
for B := 12 downto 1 do
Array_Name[B] := B - 2;
for B := 12 downto 2 do
writeln(Array_Name[B]:10, A:10, B:10);
end. {advanced_pencil-10.p}
% pc PASCAL/advanced_pencil-10.p
% a.out
Array_Element A B
------------------------------
10 100 12
9 100 11
8 100 10
7 100 9
6 100 8
5 100 7
4 100 6
3 100 5
2 100 4
1 100 3
0 100 2