0

```
/* I have a problem with my class matran, when I make "(A+B)*(D+E)" it's no result */
/* help me to correct it */
#include<iostream.h>
#include<math.h>
#include<iomanip.h>
using namespace std;
class matran
{
int n,m;
double A[20][20];
public:
void nhap();
void in(matran);
matran operator+(matran);
matran operator-(matran);
matran operator*(matran);
};
////////////////////////////////////////////////////////
void matran::nhap()
{
char s;
cout<<"\nten ma tran:";
cin>>s;
cout<<"nhap vao kich thuoc ma tran bac m*n\n";
cout<<"m=";
cin>>m;
while(m<=0)
{
cout<<"\nnhap lai m";
cin>>m;
}
cout<<"\nn=";
cin>>n;
while(n<=0)
{
cout<<"\nnhap lai n";
cin>>n;
}
cout<<"\nnhap vao cac phan tu cua ma tran" <<s<<"[m*n]\n";
//nhap theo hang ngang
for(int i=1;i<=m;i++)
for(int j=1;j<=n;j++)
{
cout<<s<<"["<<i<<","<<j<<"]=";
cin>>A[i][j];
}
}
///////////////////////////////////////////////////////////
void matran::in(matran)
{
cout<<"in ra ma tran: \n";
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
cout<<A[i][j]<<setw(6);
cout<<"\n";
}
}
///////////////////////////////////////////////////////////
matran matran::operator+(matran B)
{
matran C;
if(this->m!=B.m||this->n!=B.n)
cout<<"\nkhong thuc hien duoc phep cong hai ma tran nay\n";
else
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
C.A[i][j]=this->A[i][j]+B.A[i][j];
cout<<C.A[i][j]<<setw(6);
}
cout<<"\n";
}
return C;
}
//////////////////////////////////////////////////////////
matran matran::operator-(matran B)
{
matran C;
if(this->m!=B.m||this->n!=B.n)
cout<<"\nkhong thuc hien duoc phep tru hai ma tran nay\n";
else
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
C.A[i][j]=this->A[i][j]-B.A[i][j];
cout<<C.A[i][j]<<setw(6);
}
cout<<"\n";
}
return C;
}
//////////////////////////////////////////////////////////
matran matran::operator*(matran B)
{
matran C;
if(this->n!=B.m)
cout<<"\nkhong thuc hien duoc phep nhan hai ma tran nay";
else
{
cout<<"\nket qua phep nhan hai ma tran:\n";
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
C.A[i][j]=0;
for(int k=1;k<=m;k++)
C.A[i][j]+=this->A[i][k]*B.A[k][j];
cout<<C.A[i][j]<<setw(6);
}
cout<<"\n";
}
return C;
}
}
///////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////
void main()
{
matran A, B, C, D, E;
cout<<"nhap vao ma tran thu nhat \n";
A.nhap();
A.in(A);
cout<<"nhap vao ma tran thu hai \n";
B.nhap();
B.in(B);
cout<<"nhap vao ma tran thu ba \n";
D.nhap();
D.in(D);
cout<<"nhap vao ma tran thu tu \n";
E.nhap();
E.in(E);
cout<<"\nket qua cua phep tinh sau: (A+B)*(D+E) \n";
C=(D+E)+B;
}
```

*Edited 3 Years Ago by mike_2000_17*: Fixed formatting