#include"iostream.h"
int &ham(int &a, int b){
b +=a;
if(b>4) a++;
return a;
}
int main()
{int i=2,j=4;
cout<<"dia chi a"<<&i<<endl;
int k=ham(i,j);
k++;
cout<<i<<" "<<j<<" "<<k<<endl;
int &l=ham(i,j);
l++;
cout<<i<<" "<<j<<" "<<l<<endl;
return 0;
}

#include"iostream.h"
void nhap(int **a,int m,int n)
{
for(int i=0;i<m;i++)
for(int j=0;j<n;j++)
{
cout<<"phan tu ["<<i<<"]["<<j<<"]=";
cin>>a[i][j];
}
}
void display(int **a,int m,int n)
{
for(int i=0;i<m;i++)
{
for(int j=0;j<n;++j)
cout<<a[i][j]<<" ";
cout<<"\n";
}
}
void deletematrix(int **a,int m)
{for(int i=0;i<m;i++)
delete [] a[m];
delete [] a;
}
void congmatrix(int **a,int **b,int m,int n)
{
for(int i=0;i<m;i++)
for(int j=0;j<n;j++)
a[i][j]+=b[i][j];
}
int main1()
{
int m,n;int **a,**b;
laplai: cout<<"nhap lan luot he so m,n cua matrix"<<endl;
cin>>m;cin>>n;
a=new int*[m];b=new int*[m];
for(int i=0;i<m;i++)
{
a[i]=new int[n];
b[i]=new int[n];
}
cout<<"nhap cac phan tu cua matrix A:"<<endl;
nhap(a,m,n);
cout<<"nhap cac phan tu cua matrix B:"<<endl;
nhap(b,m,n);
cout<<"view matrix A:"<<endl;
display(a,m,n);
cout<<"view matrix B:"<<endl;
display(b,m,n);
congmatrix(a,b,m,n);
cout<<"tong 2 matrix la:"<<endl;
display(a,m,n);
deletematrix(a,m);
deletematrix(b,m);
return 0;
}
int main2()
{
int m,n,p,q;int **a,**b,**c;
cout<<"nhap lan luot he so m,n cua matrix A"<<endl;
cin>>m;cin>>n;
cout<<"nhap lan luot he so p,q cua matrix B"<<endl;
cin>>p;cin>>q;
if(p!=n)
cout<<"matrix A ko the nhan voi matrix B..."<<endl;
else
{
a=new int*[m];b=new int*[p];c=new int*[m];
for(int i=0;i<m;i++)
{
a[i]=new int[n];
c[i]=new int[q];
}
for(int j=0;j<p;j++)
b[j]=new int[q];
cout<<"nhap cac phan tu cua matrix A:"<<endl;
nhap(a,m,n);
cout<<"nhap cac phan tu cua matrix B:"<<endl;
nhap(b,p,q);
cout<<"view matrix A:"<<endl;
display(a,m,n);
cout<<"view matrix B:"<<endl;
display(b,p,q);
for(int i=0;i<m;i++)
for(int j=0;j<q;j++)
{
c[i][j]=0;
for(int k=0;k<n;k++)
c[i][j]+=a[i][k]*b[k][j];
}
cout<<"tich matrix A nhan matrix B la:"<<endl;
display(c,m,q);
deletematrix(a,m);
deletematrix(b,p);
deletematrix(c,m);
}
}
int main()
{
int t;char x;
tiep: cout<<"lua chon"<<endl;
cout<<"1.cong 2 matrix"<<endl;
cout<<"2.nhan 2 matrix"<<endl;
cout<<"su lua chon cua ban:";
cin>>t;
switch(t)
{
case 1:main1();
break;
case 2:main2();
break;
default:cout<<"NHAP LOI!!!"<<endl;
}
cout<<"ban co muon tiep tuc ko?  Y/N?"<<endl;
cin>>x;
if(x=='y'||x=='Y')
goto tiep;
return 0;
}

void nhanmatrix(float **a,float **b,float **c,int m,int n,int q)
{
for(int i=0;i<m;i++)
{
for(int j=0;j<q;j++)
{
c[i][j]=0;
for(int k=0;k<n;k++)
c[i][j]=a[i][k]*b[k][q]+c[i][j];
}
}
}

void nhap(int **a,int m,int n)
{
a=new int *[m];
for(int i=0;i<m;i++)
{a[i]=new int [n];
for(int j=0;j<n;j++)
{
cout<<"phan tu ["<<i<<"]["<<j<<"]=";
cin>>a[i][j];
}
}
}