有两个矩阵a和b,均为3行4列.求两个矩阵之和.重载运算符“+”,使之能用于矩阵相加.如c=a+b.
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#include

//using namespace std;

class matrix

{

public:

matrix(){};

matrix(int array[3][3])

{

for(int i = 0; i < 3; i++)

for(int j = 0; j < 3; j++)

a[i][j] = array[i][j];

}

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

friend istream & operator >> (istream &input,matrix &);

friend ostream & operator m.a[i][j];

return input;

}

void main()

{

matrix m,m1,m2;

cout

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