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-14.p
{ Advanced Pascal Programming Language Exercises
Dr. Thomas W. MacFarland
advanced_pencil-14.p
}
{ The purpose of this program is to:
1. Demonstrate the use of an array of integer variables.
2. Demonstrate how elements of an array can be used in
a math activity.
3. Demonstrate the construction of an addition table.
}
program Demonstrate_Arrays_5;
const Size = 7;
var Result : array[1..Size,1..Size] of integer;
R : integer;
C : integer;
begin
for R := 1 to Size do
for C := 1 to Size do
Result[R, C] := R + C;
for R := 1 to Size do begin
for C := 1 to Size do
write(' ', R:1, '+', C:1, ' = ', Result[R,C]:2);
writeln;
end;
end. {advanced_pencil-14.p}
% pc PASCAL/advanced_pencil-14.p
% a.out
1+1 = 2 1+2 = 3 1+3 = 4 1+4 = 5 1+5 = 6 1+6 = 7 1+7 = 8
2+1 = 3 2+2 = 4 2+3 = 5 2+4 = 6 2+5 = 7 2+6 = 8 2+7 = 9
3+1 = 4 3+2 = 5 3+3 = 6 3+4 = 7 3+5 = 8 3+6 = 9 3+7 = 10
4+1 = 5 4+2 = 6 4+3 = 7 4+4 = 8 4+5 = 9 4+6 = 10 4+7 = 11
5+1 = 6 5+2 = 7 5+3 = 8 5+4 = 9 5+5 = 10 5+6 = 11 5+7 = 12
6+1 = 7 6+2 = 8 6+3 = 9 6+4 = 10 6+5 = 11 6+6 = 12 6+7 = 13
7+1 = 8 7+2 = 9 7+3 = 10 7+4 = 11 7+5 = 12 7+6 = 13 7+7 = 14