第九周 任务四

#include <iostream>

using namespace std;

class Douary
{
public:
 Douary(int m, int n);//构造函数：用于建立动态数组存放m行n列的二维数组（矩阵）元素，并将该数组元素初始化为
 Douary(const Douary &d);
 ~Douary(){delete [] Array;} //析构函数：用于释放动态数组所占用的存储空间。

 friend istream & operator >> (istream &input, Douary &d);//重载运算符“>>”输入二维数组，其中d为Dousry类对象；
 friend ostream & operator << (ostream &output, Douary &d);//重载运算符“<<”以m行n列矩阵的形式输出二维数组，
 //其中d为Douary类对象。
 friend Douary operator + (const Douary &d1, const Douary &d2);//两个矩阵相加，规则：对应位置上的元素相加
 friend Douary operator - (const Douary &d1, const Douary &d2);//两个矩阵相减，规则：对应位置上的元素相减
 bool operator == (const Douary &d);//判断两个矩阵是否相等，即对应位置上的所有元素是否相等
private:
 int * Array;      //Array 为动态数组指针。
 int row;          //row  为二维数组的行数。
 int col;          //col   为二维数组的列数。
};
Douary::Douary(int m, int n)
{
 row = m, col = n;
 Array = new int [row*col];

 for (int i = 0; i < row*col; i++)
  Array[i] = 0;
}
Douary::Douary(const Douary &d)
{
 col = d.col, row = d.row;
 Array = new int[row*col]; 

 for (int i = 0; i < row*col; i++)
  Array[i] = d.Array[i];
}
istream & operator >> (istream &input, Douary &d)
{
 cout << "请输入元素（" << d.row << "行" << d.col <<"列）：" << endl;

 for (int i = 0; i < d.col*d.row; i++)
 { 
  input >> d.Array[i];
 }

 return input;
}
ostream & operator << (ostream &output, Douary &d)
{
 for (int i = 0; i < d.col*d.row; i++)
 {
  if (i % d.col == 0) cout << endl;
  output << d.Array[i] <<'\t';
 }
 cout << endl;
 return output;
}
Douary operator + (const Douary &d1, const Douary &d2)
{
 Douary D(d1);

 for (int i = 0; i < d1.col*d1.row; i++)
   D.Array[i] = d1.Array[i] + d2.Array[i];

 return D; 
}
Douary operator - (const Douary &d1, const Douary &d2)
{
 Douary D(d1);

 for (int i = 0; i < d1.col*d1.row; i++)
   D.Array[i] = d1.Array[i] - d2.Array[i];

 return D; 
}
bool Douary::operator == (const Douary &d)
{
 if (this->col == d.col && this->row == d.row)
 {
  for (int i = 0; i < d.col*d.row; i++)
    if (*(this->Array+i) != *(d.Array+i))
     return false;
 }
 else
  return false;

 return true;
}
int main()
{
 Douary d1(2, 3), d2(2, 3);

 cout << "输入d1:" << endl;
 cin >> d1;
 cout << "输入d2:" << endl;
 cin >> d2;

 cout << "d1=" ;
 cout << d1;
 cout << "d2=";
 cout << d2;

 cout << "d1+d2=";
 cout << (d1+d2);
 cout << "d1-d2=";
 cout << (d1-d2);

 cout << "d1" << ((d1==d2)? "==":"!=") << "d2" << endl;

 system("pause");
 return 0;
}