#include<iostream>

 using namespace std;

 class Matrix

 {

     int row;//矩阵的行

     int col;//矩阵的列

     int **a;//保存二维数组的元素

 public:

     Matrix();//默认构造函数

     Matrix(int r, int c);

     Matrix(const Matrix &is);//拷贝构造函数

     void Set();//输入矩阵元素

     void Madd(const Matrix &is);//矩阵加

     Matrix Mmul(const Matrix &is);//矩阵乘

     void display();//显示矩阵元素

 };

 Matrix::Matrix(int r, int c)

 {

     row = r;

     col = c;

     a = (int **)malloc(sizeof(int*)*row);

     for (int r = ; r < row; r++)

     {

         *(a + r) = (int*)malloc(sizeof(int)*col);

     }

 }

 Matrix::Matrix(const Matrix & is)

 {//拷贝构造函数

     row = is.row;

     col = is.col;

     a = new int*[row];

     for (int i = ; i < row; i++)

     {

         a[i] = new int[col];

     }

     a = is.a;

 }

 void Matrix::Set()

 {

     printf("请输入数：\n");

     for (int i = ; i < row; i++)

         for (int j = ; j < col; j++)

             cin >> a[i][j];

 }

 void Matrix::Madd(const Matrix & is)

 {

     if (row != is.row || col != is.col)//判断两矩阵是否符合相加条件

     {

         cout << "相加的矩阵必须行和列一致";

     }

     else

     {

         for (int i = ; i < row; i++)

         {

             for (int j = ; j < col; j++)

             {

                 a[i][j] += is.a[i][j];

             }

         }

     }

 }

 Matrix Matrix::Mmul(const Matrix & is)

 {

     Matrix M3(this->row, is.col);

     if (this->col != is.row)//判断是否符合相乘条件

     {

         cout << "不符合两矩阵相乘的条件";

     }

     else

     {

         for (int i = ; i < M3.row; i++)

         {

             for (int j = ; j < M3.col; j++)

             {

                 M3.a[i][j] = ;

                 for (int n = ; n < is.row; n++)

                 {

                     M3.a[i][j] += this->a[i][n] * is.a[n][j];

                 }

             }

         }

     }

     return M3;

 }

 void Matrix::display()

 {//输出矩阵

     for (int i = ; i < row; i++)

     {

         for (int j = ; j < col; j++)

         {

             cout << a[i][j] << " ";

         }

         cout << endl;

     }

     cout << endl;

 }

 int main()

 {

     Matrix m1(, );

     m1.Set();

     m1.display();

     Matrix m2(, );

     m2.Set();

     m2.display();

     Matrix m3(, );

     m3.Set();

     m3.display();

     cout << "m1+m2=" << endl;

     m1.Madd(m2);

     m1.display();

     Matrix m4(m1.Mmul(m3));

     cout << "m1*m3=" << endl;

     m4.display();

     system("pause");

     return ;

 }