Contributor: SWAG SUPPORT TEAM
program factor;
uses
crt;
type
list = ^ node;
node = record
data:integer;
next:list;
end;
var
squrl, squll,
nonerl, nonell:list;
procedure push(var head:list; item:integer);
var
temp:list;
begin
new(temp);
temp^.data:= item;
temp^.next:= head;
head:= temp;
end;
function x(l:list; n:integer):integer;
var
i:integer;
begin
for i:= 1 to n-1 do
l:= l^.next;
x:= l^.data;
end;
function dimL(l:list):integer;
var
count:integer;
begin
count:= 0;
while l nil do
begin
l:= l^.next;
count:= count + 1;
end;
dimL:= count;
end;
procedure show(l:list);
begin
while l nil do
begin
write(l^.data, ' ');
l:= l^.next;
end;
writeln;
end;
procedure negate(var l:list);
var
temp:list;
begin
temp:= l;
while temp nil do
begin
temp^. data:= -temp^.data;
temp:= temp^.next;
end;
end;
procedure display(a1, b1, a2, b2:integer);
begin
writeln('(', a1, 'x + ', b1, ')(', a2, 'x + ', b2, ')');
end;
procedure getfactors(num:integer; var list1, list2:list);
var
i:integer;
test:integer;
done:boolean;
begin
if num> 0 then
test:= 1
else
test:= num;
repeat
if num / test = num div test then
begin
push(list1, test);
push(list2, num div test);
end;
test:= test + 1;
if test = 0 then
test:= 1;
until abs(test)> abs(num);
end;
procedure cleanup(var list1, list2:list);
begin
list1:= nil;
list2:= nil;
end;
procedure geti(a1, a2, one:integer; var b:integer);
var
i:integer;
begin
for i:= 1 to dimL(nonerl) do
if a1 * x(nonell, i) + a2 * x(nonerl, i) = one then
b:= i;
end;
procedure doit;
var
squ,
one,
none:integer;
i, j:integer;
a, b, c:integer;
solved:boolean;
begin
write('A: ');
readln(squ);
write('B: ');
readln(one);
write('C: ');
readln(none);
solved:= false;
cleanup(squrl, squll);
getfactors(squ, squrl, squll);
cleanup(nonerl, nonell);
getfactors(none, nonerl, nonell);
for j:= 1 to diml(squrl) do
for i:= 1 to diml(nonerl) do
begin
a:= x(squrl, j) * x(nonerl, i);
c:= x(squll, j) * x(nonell, i);
{writeln('A = ', a, ' C = ', c); readln;}
if (a = squ) and (c = none) then
begin
b:= i;
{writeln('A1 = ', x(squrl, j), ' A2 = ', x(squll, j));}
if one < 0 then
begin
negate(nonerl); negate(nonell);
end;
geti(x(squrl, j), x(squll, j), one, b);
{writeln('B = ', x(squrl, j) * x(nonell, b) + x(squll, j) * x(nonerl, b));}
{FOIL check} if (c = x(nonerl, b) * x(nonell, b)) and
(one = x(squrl, j) * x(nonell, b) + x(squll, j) * x(nonerl, b)) then
begin
display(x(squrl, j), x(nonerl, b), x(squll, j), x(nonell, b));
solved:= true;
end;
end;
end;
if not solved then
writeln('Does not factor.');
end;
begin
clrscr;
doit;
{show(squrl); show(squll);
show(nonerl); show(nonell);}
while not keypressed do;
end.