🚀 go-pugleaf

> ==> Astute_Firefly(n)                        ˵��: 
> ���˳�ѧ��������̣���BCдһ����ѧ������࣬���������������⣬ 
> ����ָ�̡� 
> 1 �Ծ���������в����󣬵�һ��Ԫ�ؾ�������0�����ֻ�ö������ڴ�ռ� 
> (�ڳ����б���Ϊÿ���±��Ҫ��1��ʵ��̫��Ť�ˡ�) 
> 2 �˷���������غ��ڸú����ж������м�������temp�� 
> ���в��� m3=m1*m2 ʱ��temp ��ָ��ָ��m2����˽��m3���� 
> ͬʱm2�е����Ҳ���޸ġ� 
> �����Ǹ������ݽ���ֺ������λ�������æ���ڴ�����л�� 
> ------------------------------------------------- 
> #include <iostream.h> 
> #include <fstream.h> 
> #include <math.h> 
> class Cmatrix { 
>       private: 
>            long int row,col; 
>            double *buffer; 
>       public: 
>            Cmatrix(){row=0;col=0;buffer=NULL;}; 
may be should use delete(buffer);
>            ~Cmatrix(){if (buffer!=NULL){row=0;col=0;delete[] buffer;buffer=NULL;}} 
>            void LoadFromFile(char *); 
>            void operator=(const Cmatrix &); 
>            void disp(); 
>            double & operator[](long int); 
>            Cmatrix turn(); 
>            friend Cmatrix operator+(const Cmatrix&,const Cmatrix&); 
>            friend Cmatrix operator+(const Cmatrix&,double); 
>            friend Cmatrix operator+(double ,const Cmatrix&); 
>            void operator+=(double); 
>            void operator+=(const Cmatrix &); 
>            friend Cmatrix operator-(const Cmatrix&,const Cmatrix&); 
>            friend Cmatrix operator-(const Cmatrix&,double); 
>            friend Cmatrix operator-(double ,const Cmatrix&); 
>            void operator-=(double); 
>            void operator-=(const Cmatrix &); 
>            Cmatrix operator-(); 
>            friend Cmatrix operator*(const Cmatrix &, const Cmatrix &); 
>            friend Cmatrix operator*(const Cmatrix&, double); 
>            friend Cmatrix operator*(double, const Cmatrix &); 
>            void operator*=(double); 
>       }; 
> void   Cmatrix::LoadFromFile(char *str) 
>        { 
>        ifstream myfile(str); 
>        myfile>>row>>col; 
>        if (row<0||row>20000||col<0||col>20000) 
>           { 
>           row=0;col=0; 
>           myfile.close(); 
>           } 
>        else 
>           { 
>           if (buffer) {delete[] buffer;buffer=NULL;} 
>           buffer=new double [row*col+1]; 
>           for (long int i=0;i<row;i++) 
>               for (long int j=0;j<col;j++) 
>                    myfile>>buffer[i*col+j+1]; 
>           } 
>           myfile.close(); 
>        } 
> void   Cmatrix::operator=(const Cmatrix & m) 
>        { 
>        if (buffer) {delete[] buffer; buffer=NULL;} 
>        buffer=new double[m.row*m.col+1]; 
>        row=m.row; 
>        col=m.col; 
>        for (long int i=0;i<row;i++) 
>            for (long int j=0;j<col;j++) 
>                buffer[i*col+j+1]=m.buffer[i*col+j+1]; 
>        return; 
>        } 
> void Cmatrix::disp() 
>      { 
>      cout<<row<<"  "<<col<<endl; 
>      for (long int i=0;i<row;i++) 
>          { 
 

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