fork download
copy 
  1. #include <iostream>
  2. #include <cstring>
  3. using namespace std;
  4.  
  5. class matrix
  6.   {
  7.    private:
  8.    unsigned m_height,m_width;
  9.    double *m_data;
  10.    public:
  11.    matrix(unsigned height=0,unsigned width=0):m_height(height),m_width(width),m_data(new double[height*width])
  12.      {
  13.       memset(m_data,0,height*width);
  14.      }
  15.    unsigned height()const { return m_height; }
  16.    unsigned width()const { return m_width; }
  17.    double *operator[](unsigned y) { return m_data+y*m_width; }
  18.    const double *operator[](unsigned y)const { return m_data+y*m_width; }
  19.    friend ostream &operator<<(ostream &s,const matrix m)
  20.      {
  21.       for(unsigned y=0;y<m.height();++y,s<<endl) for(unsigned x=0;x<m.width();++x) s<<m[y][x]<<'\t';
  22.      }
  23.   };
  24.  
  25. int main()
  26.   {
  27.    matrix m(3,3);
  28.    m[1][1]=3;
  29.    cout<<m;
  30.    return 0;
  31.   }
Success #stdin #stdout 0s 3428KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
0	0	0	
0	3	0	
0	0	0
https://ideone.com/VaDpHY
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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!