#include <iostream>
using namespace std;
#include "p.h"
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);//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(); //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[m*n];
for(int i=0; i<row; i++)
for(int j=0; j<col; j++)
Array[i*col+j]=0;
}
Douary::Douary(const Douary &d)
{
row=d.row;
col=d.col;
Array = new int[row*col];
for(int i=0; i<row; i++)
{
for(int j=0; j<col; j++)
{
Array[i*col+j]=d.Array[i*col+j];
}
}
}
Douary::~Douary() //析构函数：用于释放动态数组所占用的存储空间
{
delete [] Array;
}
istream &operator>>(istream &input, Douary &d)
{
for(int i=0; i<d.row; ++i)
{
for(int j=0; j<d.col; ++j)
{
cin>>d.Array[i*d.col+j];
}
}
return input;
}
ostream &operator<<(ostream &output, Douary &d)
{
for(int i=0; i<d.row; ++i)
{
for(int j=0; j<d.col; ++j)
cout<<d.Array[i*d.col+j]<<"\t";
cout<<endl;
}
cout<<endl;
return output;
}
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
{
Douary d(d1.row,d1.col);
for(int i=0; i<d1.row; ++i)
{
for(int j=0; j<d1.col; ++j)
d.Array[i*d1.col+j]=d1.Array[i*d1.col+j]+d2.Array[i*d1.col+j];
}
return d;
}
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
{
Douary d(d1.row,d1.col);
for(int i=0; i<d1.row; ++i)
{
for(int j=0; j<d1.col; ++j)
{
d.Array[i*d1.col+j]=d1.Array[i*d1.col+j]-d2.Array[i*d1.col+j];
}
}
return d;
}
bool Douary::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
{
if(row!=d.row||col!=d.col)
return false;
bool flag = true;
for(int i=0; i<row; ++i)
{
for(int j=0; j<col; ++j)
{
if (Array[i*col+j]!=d.Array[i*col+j])
{
flag=false;
break;
}
//if (!flag) break;
}
}
return flag;
}
int main()
{
Douary d1(3,5),d2(3,5);
cout<<"输入d1(3,5):"<<endl;
cin>>d1;
cout<<"输入d2(3,5):"<<endl;
cin>>d2;
cout<<"d1="<<endl;
cout<<d1;
cout<<"d2="<<endl;
cout<<d2;
cout<<"d1+d2="<<endl;
Douary d3=(d1+d2);
cout<<d3;
cout<<"d1-d2="<<endl;
cout<<(d1-d2);
cout<<"d1"<<((d1==d2)?"==":"!=")<<"d2"<<endl;
system("pause");
return 0;
}
感悟：
老师：if (!flag) break 是啥意思啊？没有它不也行吗？