745 / Л.Р.№4 / lab4_var_9

program zadacha;
uses crt;
var a,b,d,c,h:string; k1,k,i,n:integer; t:boolean;
function suma(f,d:string):string;
var c,l:integer;
begin
l:=0;
suma:='0000000';
for c:=7 downto 1 do
if ((f[c]='1') and (d[c]='1') and (l=0)) or
((f[c]='1') and (d[c]='0') and (l=1)) or
((f[c]='0') and (d[c]='1') and (l=1)) then begin
suma[c]:='0';
l:=1;
end
else if ((f[c]='1') and (d[c]='0') and (l=0)) or
((f[c]='0') and (d[c]='1') and (l=0)) or
((f[c]='0') and (d[c]='0') and (l=1)) then begin
suma[c]:='1';
l:=0;
end
else if ((f[c]='1') and (d[c]='1') and (l=1)) then begin
suma[c]:='1';
l:=1;
end
else begin
suma[c]:='0';
l:=0;
end;
end;
function dodat(e:string):string;
var i:integer;
begin
i:=length(e);
while e[i]<>'1' do i:=i-1;
for i:=(i-1) downto 1 do
if e[i]='1' then e[i]:='0'
else e[i]:='1';
dodat:=e;
end;
begin clrscr;
writeln('vvedite dilene'); readln(a); t:=true;
writeln('vvedite dilnik'); readln(b);
if (length(a)<>8) or (length(b)<>8) then t:=false
else begin
for i:=1 to 8 do
if ((a[i]<>'1') and (a[i]<>'0')) then t:=false;
for i:=1 to 8 do
if ((b[i]<>'1') and (b[i]<>'0')) then t:=false;
end;
if t=false then writeln('wrong chislo')
else begin
if a[1]=b[1] then h:='0'
else h:='1';
delete(a,1,1);
delete(b,1,1);
k:=0;
i:=1;
while a[i]<>'1' do begin
k:=k+1;
i:=i+1;
end;
k1:=0;
i:=1;
while b[i]<>'1' do begin
k1:=k1+1;
i:=i+1;
end;
if k>k1 then begin
writeln('chastka=0');
writeln('ostacha=',a);
end
else begin
delete(b,1,k1-k);
for i:=1 to k1-k do b:=concat(b,'0');
k:=k1-k;
d:=dodat(b);
a:=suma(a,d);
c:='0000000';
for i:=1 to k do begin
for n:=7 downto 2 do b[n]:=b[n-1];
b[1]:='0';
for n:=1 to 6 do c[n]:=c[n+1];
if a[1]='1' then c[7]:='0'
else c[7]:='1';
if a[1]='0'then begin
d:=dodat(b);
a:=suma(a,d);
end
else a:=suma(a,b);
end;
for n:=1 to 6 do c[n]:=c[n+1];
if a[1]='1' then c[7]:='0'
else c[7]:='1';
t:=true;
for n:=1 to 7 do if a[n]<>'0' then t:=false;
if t=false then if a[1]='0' then begin
d:=dodat(b);
a:=suma(a,d);
end
else a:=suma(a,b)
else for n:=1 to 7 do a[n]:='0';
end;
end;
c:=concat(h,c);
if a[1]='1' then a:=dodat(a);
a:=concat('0',a);
writeln('chastka=',c);
writeln('ostacha=',a);
end.