Pascal Programming Convert Decimal to Binary

var
  a,b,c,e,f:integer;
  d:array [1..255] of integer;

begin
write('input a decimal number! '); readln(a);
write('Binary of decimal ',a,' is: ');
e:=a;

repeat
b:=b+1;
c:= trunc (a/2);
d[b]:=a mod 2;
a:=c;
if (c=1) then
begin
  b:=b+1;
  d[b]:=1;
end;
until c=1;

for f:=1 to b do
begin
  c:= trunc (e/2);
  d[f]:=e mod 2;
  e:=c;
end;

for f:= b downto 1 do
begin
  write(d[f]);
end;

readln
end.

If the program is run:

input a decimal number! 17 Binary of decimal 17 is 10001

If there is something not understand, please asked... : )
Hope it is useful, thank you... :)

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