while (left < right)
      {
       int mid = (left + right) / 2;
       printf("%d", mid);
       scanf("%c", ans);
       if (ans == '=')
          {
          right = mid;
          break;
          }
       if (ans == '<')
          right = mid;
          else
          left = mid + 1;
      }
    printf("Загаданное число = %d", right);