745 / Л.Р.№2 / Lab2

uses crt;
var j,i:longint;
S:string;
begin
clrscr;
i:=0;
write('Write your number B(2) - ');readln(S);
repeat
inc(i);
if (S[i]<>'0') and (S[i]<>'1')
then
begin
writeln('Wrong number!');
writeln('Try again!');
writeln;
write('Write your number B(2) - ');readln(S);
i:=0;
end;
until i>=length(S);
j:=length(S);
if S[1]='0'
then write('Result - ',S)
else
begin
while (S[j]='0') and (j>=1) do dec(j);
for i:=2 to 8 do
if i<j
then
if S[i]='1'
then S[i]:='0'
else S[i]:='1';
writeln('Result - ',S);
end;
readkey;
end.