// vecto

#include<iostream.h>

#include<conio.h>

class VT

{

int n; float a[50];

public:

friend istream& operator>>(istream& is,VT &b);

friend ostream& operator<<(ostream& os,VT b);

VT operator+(VT);

int operator==(VT);

float operator*(VT);

};

istream& operator>>(istream& is,VT &b)

{

cout<<"

nhap so phan tu: ";

do

{ is>>b.n; if(b.n<=1) cout<<"nhap n lon hon 1: "; }

while(b.n<=1);

for(int i=0;i<b.n;i++)

{cout<<"nhap phan tu thu "<<(i+1)<<": ";is>>b.a[i];}

return(is);

}

ostream& operator<<(ostream& os,VT b)

{ os<<"(";

for(int i=0;i<b.n-1;i++)

{ os<<b.a[i]<<","; }

os<<b.a[b.n-1]<<")";

return(os);

}

int VT::operator==(VT b)

{

if(n==b.n) return(0);

else return(1);

}

VT VT::operator+(VT b)

{ VT kq;

kq.n=n;

for(int i=0;i<n;i++)

{ kq.a[i]=a[i]+b.a[i]; }

return(kq);

}

float VT::operator*(VT b)

{ float kq=0;

for(int i=0;i<n;i++)

{ kq=kq+a[i]*b.a[i]; }

return(kq);

}

main()

{VT c,b,d;

cout<<" nhap 2 vecto

";cin>>c>>b;

if(c==b) cout<<"

2 vecto ko thuoc cung he toa do,ko thuc hien duoc yeu cau bai toan";

else

{

cout<<"

tong 2 vecto la vecto: "<<(d=c+b);

cout<<"

tich vo huong 2 vecto la: "<<(c*b);

}

getch();

}