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  1. #include <cstddef>
  2. #include <iostream>
  3. #include <vector>
  4.  
  5. const std::size_t HEIGHT = 10;
  6. const std::size_t WIDTH = 10;
  7.  
  8. typedef std::vector<char> MatrixDim;
  9. typedef std::vector<MatrixDim> Matrix;
  10. typedef MatrixDim::size_type MatrixDimSize;
  11.  
  12. inline void set_bit(Matrix& matrix, MatrixDimSize x, MatrixDimSize y)
  13. {
  14.     matrix[(x) / 8][y] |= (0x80 >> ((x) % 8));
  15. }
  16.  
  17. void print_screen(Matrix const& matrix)
  18. {
  19. 	for (MatrixDimSize y = 0; y < HEIGHT; y++)
  20.     {
  21.         for (MatrixDimSize x = 0; x < WIDTH/8+1; x++)
  22.         {
  23.             for (int i = 0x80; i != 0; i >>= 1)
  24.             {
  25.                 std::cout << (((matrix[x][y] & i) != 0) ? '*' : ' ');
  26.             }
  27.         }
  28.  
  29.         std::cout << "\n";
  30.     }
  31. }
  32.  
  33. int main()
  34. {
  35.     Matrix matrix(HEIGHT, MatrixDim(WIDTH));
  36.  
  37.     for (MatrixDimSize x = 0; x < WIDTH; x++)
  38.     {
  39.         for (MatrixDimSize y = 0; y < HEIGHT; y++)
  40.         {
  41.             if (x == 0 || y == 0 || x == WIDTH-1 || y == HEIGHT-1)
  42.             {
  43.                 set_bit(matrix, x, y);
  44.             }
  45.         }
  46.     }
  47.  
  48.     print_screen(matrix);
  49. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
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**********      
*        *      
*        *      
*        *      
*        *      
*        *      
*        *      
*        *      
*        *      
**********
https://ideone.com/rquKtG
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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