fork download 
  1. #include <iostream>
  2. #include <iomanip>
  3. #include <memory>
  4. #include <fstream>
  5. #include <sstream>
  6.  
  7.  
  8. struct SquareMatrix
  9. {
  10.     SquareMatrix(unsigned dimensions) 
  11.         : _dim(dimensions), _matrix(new int[_dim*_dim]) {}
  12.  
  13.     unsigned dimension() const { return _dim; }
  14.  
  15.     int& operator()(unsigned row, unsigned col)
  16.     {
  17.         return _matrix[row * _dim + col];
  18.     }
  19.  
  20.     int operator()(unsigned row, unsigned col) const
  21.     {
  22.         return _matrix[row * _dim + col];
  23.     }
  24.  
  25. private:
  26.     unsigned _dim;
  27.     std::unique_ptr<int[]> _matrix;
  28. };
  29.  
  30. std::ostream& operator<<(std::ostream& os, const SquareMatrix& mat)
  31. {
  32.     for (unsigned i = 0; i < mat.dimension(); ++i)
  33.     {
  34.         for (unsigned j = 0; j < mat.dimension(); ++j)
  35.             os << mat(i, j) << ' ';
  36.  
  37.         os << '\n';
  38.     }
  39.     return os;
  40. }
  41.  
  42. std::istream& operator>>(std::istream& is, SquareMatrix& mat)
  43. {
  44.     for (unsigned i = 0; i < mat.dimension(); ++i)
  45.         for (unsigned j = 0; j < mat.dimension(); ++j)
  46.             is >> mat(i, j);
  47.  
  48.     return is;
  49. }
  50.  
  51. int main()
  52. {
  53.     // std::ifstream in("matrix.txt");
  54.     std::istringstream in("3\n5 7 10\n5 3 2\n0 6 8");
  55.  
  56.     unsigned size;
  57.     in >> size;
  58.  
  59.     SquareMatrix matrix(size);
  60.     in >> matrix;
  61.  
  62.     std::cout << matrix << '\n';
  63. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
Standard input is empty
stdout 
5 7 10 
5 3 2 
0 6 8
https://ideone.com/YlGB4E
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!