求找错！！重载运算符实现矩阵运算的。。

Question

#include
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

using namespace std;

class Matrix
{
public:
Matrix();
Matrix(int);
// ~Matrix();
friend Matrix operator +(Matrix &,Matrix &);//矩阵相加
friend Matrix operator *(Matrix &,Matrix &);//矩阵相乘
friend Matrix operator *(Matrix &,int);//矩阵乘数
friend Matrix operator *(int,Matrix &);//数乘矩阵
void display();

private:        
    int *pt;
    int N;  

};

Matrix::Matrix()
{
N=0;
pt=NULL;
}
Matrix::Matrix(int n)
{
N=n;
pt=new int[N*N];
for(int i=0;i {
for(int j=0;j cin>>pt[i*N+j];
}

}
/*Matrix::~Matrix()
{
delete pt;
}*/
Matrix operator +(Matrix &a,Matrix &b)
{
for(int i=0;i<a.N;i++)
for(int j=0;j<a.N;j++)
(*(a.pt+i*a.N+j)=*(a.pt+i*a.N+j))+(*(b.pt+i*b.N+j));

return a;
}
Matrix operator (Matrix &a,int x)
{
for(int i=0;i<a.N;i++)
for(int j=0;j<a.N;j++)
((a.pt+i*a.N+j)=*(a.pt+i*a.N+j))*x;
return a;
}
Matrix operator (int y,Matrix &a)
{

for(int i=0;i<a.N;i++)
for(int j=0;j<a.N;j++)
((a.pt+i*a.N+j)=*(a.pt+i*a.N+j))*y;
return a;
}
Matrix operator (Matrix &a,Matrix &b)
{
double sum=0;
for(int i=0;i<a.N;i++)
{
for(int j=0;j<a.N;j++)
{
for(int k=0;k<a.N;k++)
{
sum+=((a.pt+i*a.N+k))*(*(b.pt+k*b.N+j));
}
(*(a.pt+i*a.N+j))=sum;
}
}
return a;
}
void Matrix::display()
{
for(int i=0;i<N;i++)
{
cout<<"\t";
for(int j=0;j<N;j++)
cout<<*(pt+i*N+j)<<"\t";
cout<<endl;
}

}

int main()
{
int m,x,y;
cin>>m;
Matrix a(m);
cout<<"Matrix a:"< a.display();
Matrix b(m),c,d,e,f;
cout b.display();
c=a+b;
cout c.display();
d=a*b;
cout d.display();
cin>>x;
e=a*x;
cout<<"Matrix a*x:"< e.display();
cin>>y;
f=y*a;
cout<<"Matrix y*a:"<<endl;
f.display();
return 0;
}

Answer 1

https://wenku.baidu.com/view/ffdaea5baf45b307e9719728.html