Vector class

#include <iostream>
using namespace std;

template<class T>
class vector
{
     T *v;
    int size;
 public:
  void input()
   {
       cout<<"enter the size of array"<<endl;
       cin>>size;
       v=new int[size];
   }
   void create();
   void display();
   void modify();
   void  scalar_mul();


};
template<class T>
  void vector<T>::create()
   {
      for (int i=0;i<size;i++)
        v[i]=0;
   }
   template<class T>
   void vector<T>::display(){


   cout<<"(";

        for (int i=0;i<size;i++){
            cout<<v[i]<<",";
        }
        cout<<")";
   }
   template<class T>
   void vector<T>::modify()
   {
       int pos,newval;
       cout<<"enter the position you want to modify";
       cin>>pos;
       cout<<"enter new value ";
       cin>>newval;
       v[pos-1]=newval;
   }
   template<class T>
   void vector<T>::scalar_mul()
   {
       int sca;
       cout<<"enter the scalar value";
       cin>>sca;
       for(int i=0;i<size;i++)
       {
           v[i]=v[i]*sca;
       }
   }
int main()
{

    vector<int>v1;

    v1.input();
    v1.create();
    v1.display();
    v1.modify();
    v1.display();
    v1.scalar_mul();
    v1.display();
    return 0;
}