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- uses
- crt;
- begin
- var i := 0;
- var buf := '';
- Write('Введите четырехзначное число: ');
- while i < 4 do
- begin
- var ch := Readkey;
- if ch in [#48..#57] then
- begin
- Write(ch);
- buf += ch;
- i += 1;
- end
- else
- begin
- WriteLn('Упс...ошибочка...;(');
- Sleep(5000);
- Exit;
- end;
- end;
- WriteLn;
- var x := StrToInt(buf);
- WriteLn('Результат: ', x);
- end.
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