uses crt;
var f:file of integer;
n,i,a,j,k:integer;
begin
clrscr;
randomize;
assign(f,'file1');
rewrite(f);
write('Kol. chis. n=');
readln(n);
for i:=1 to n do
begin
a:=random(20)-9;
write(f,a);
end;
writeln('Исходный файл:');
reset(f);
while not eof(f) do
begin
read(f,a);
write(a,' ');
end;
writeln;
close(f);
reset(f);
k:=0;i:=0;
while i<=filesize(f)-2-k do
begin
seek(f,i);
read(f,a);
if (a<0)or odd(a) then
begin
k:=k+1;
for j:=i to filesize(f)-2 do
begin
seek(f,j+1);
read(f,a);
seek(f,j);
write(f,a);
end;
end
else i:=i+1;
end;
seek(f,filesize(f)-k-1);
read(f,a);
if (a<0)or odd(a) then k:=k+1;
seek(f,filesize(f)-k);
truncate(f);
close(f);
reset(f);
if filesize(f)=0 then write('Все элементы удалены')
else
begin
writeln('Измененный файл:');
reset(f);
for i:=0 to filesize(f)-1 do
begin
read(f,a);
write(a,' ');
end;
end;
close(f);
readln
end.