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  1. #include <iostream>
  2. #include <vector>
  3. #include <cstddef>
  4.  
  5. const std::size_t HEIGHT = 10;
  6. const std::size_t WIDTH = 10;
  7.  
  8. typedef std::vector<std::vector<char>> Matrix;
  9.  
  10. inline void set_bit(Matrix& matrix, std::size_t x, std::size_t y)
  11. {
  12.     matrix[(x) / 8][y] |= (0x80 >> ((x) % 8));
  13. }
  14.  
  15. void print_screen(Matrix const& matrix)
  16. {
  17.     std::vector<char>::size_type x, y;
  18.  
  19.     for (y = 0; y < HEIGHT; y++)
  20.     {
  21.         for (x = 0; x < WIDTH/8+1; x++)
  22.         {
  23.             for (int i = 0x80; i != 0; i = (i >> 1))
  24.             {
  25.                 if ((matrix[x][y] & i) != 0)
  26.                     std::cout << '*';
  27.                 else
  28.                     std::cout << ' ';
  29.             }
  30.         }
  31.             std::cout << "\n";
  32.     }
  33. }
  34.  
  35. int main()
  36. {
  37.     std::vector<std::vector<char>> matrix (HEIGHT, std::vector<char>(WIDTH));
  38.  
  39.     std::vector<char>::size_type x, y;
  40.  
  41.     for (x = 0; x < WIDTH; x++)
  42.     {
  43.         for (y = 0; y < HEIGHT; y++)
  44.         {
  45.             if (x == 0 || y == 0 || x == WIDTH-1 || y == HEIGHT-1)
  46.             {
  47.                 set_bit(matrix, x, y);
  48.             }
  49.         }
  50.     }
  51.  
  52.     print_screen(matrix);
  53. }
Success #stdin #stdout 0s 3472KB
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**********      
*        *      
*        *      
*        *      
*        *      
*        *      
*        *      
*        *      
*        *      
**********
https://ideone.com/NdYsVL
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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