OJ——矩阵求和--重载运算符

#include <iostream>

using namespace std;

class Matrix

{

public:

Matrix();

friend Matrix operator+(Matrix &,Matrix &);

friend ostream& operator<<(ostream&,Matrix&);

friend istream& operator>>(istream&,Matrix&);

private:

int mat[2][3];

};
Matrix::Matrix()
{
for(int i=0;i<2;++i)
for(int j=0;j<3;++j)
mat[i][j]=0;
}
Matrix operator+(Matrix &m1,Matrix &m2)
{
Matrix m;
for(int i=0;i<2;++i)
for(int j=0;j<3;++j)
{
m.mat[i][j]=m1.mat[i][j]+m2.mat[i][j];
}
return m;
}
ostream& operator<<(ostream&out,Matrix&m)
{
for(int i=0;i<2;++i)
{
for(int j=0;j<2;++j)
out<<m.mat[i][j]<<" ";
out<<m.mat[i][2]<<endl;
}
return out;
}
istream& operator>>(istream&in,Matrix&m)
{
for(int i=0;i<2;++i)
for(int j=0;j<3;++j)
{
in>>m.mat[i][j];
}
return in;
}
int main()

{

Matrix a,b,c;

cin>>a;

cin>>b;

c=a+b;

cout<<c<<endl;

return 0;

}